Journal articles: 'Cementitious matrix'

1

Abu Obaida, Feras, Tamer El-Maaddawy, and Hilal El-Hassan. "Bond Behavior of Carbon Fabric-Reinforced Matrix Composites: Geopolymeric Matrix versus Cementitious Mortar." Buildings 11, no. 5 (May 15, 2021): 207. http://dx.doi.org/10.3390/buildings11050207.

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This study aims to examine the potential use of a geopolymeric matrix as a sustainable alternative to commercial mortars in carbon fabric-reinforced matrix composites. Single-lap shear tests were conducted to examine the bond behavior at the fabric-matrix interface. Test parameters included the type of matrix (geopolymeric and cementitious matrices) and the bonded length (50 to 300 mm). The geopolymeric matrix was a blend of fly ash/ground granulated blast furnace slag activated by an alkaline solution of sodium silicate and sodium hydroxide. The bond behavior of the geopolymeric-matrix specimens was characterized and compared to that of similar specimens with a cementitious matrix. The specimens failed due to fabric slippage/debonding at the fabric-matrix interface or fabric rupture. The effective bond lengths of the geopolymeric- and cementitious-matrix specimens were 150 and 170 mm, respectively. The geopolymeric-matrix specimens exhibited higher fabric strains, higher ultimate loads, and a steeper strain profile along the bonded length than those of their cementitious-matrix counterparts. New bond-slip models that characterize the bond behavior at the fabric-matrix interface for geopolymeric- and cementitious-matrix specimens were developed. Both models exhibited equal maximum shear stress of 1.2 MPa. The geopolymeric-matrix model had, however, higher fracture energy and higher slip at maximum shear stress than those of the cementitious matrix model.

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Awan, Muhammad Maqbool Sadiq, Parviz Soroushian, Arshad Ali, and Muhammad Yousaf Saqid Awan. "High-Performance Cementitious Matrix using Carbon Nanofibers." Indonesian Journal of Science and Technology 2, no. 1 (April 1, 2017): 57. http://dx.doi.org/10.17509/ijost.v2i1.5989.

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Graphite nanomaterials would realize their reinforcement potential within cement-based materials when they are thoroughly dispersed and effectively bonded to cement hydrates. Thorough dispersion of graphite nanomaterials in the fresh cementitious matrix encounters challenges associated with the hydrophobic nature of nanomaterial surfaces and their strong tendency towards agglomeration via attractive van der Waals forces. Effective interfacial interactions with cement hydrates are further challenged by the relatively inert nature of nanomaterial surfaces. An experimental program was conducted with the objective of effectively utilizing both acid-oxidized and pristine carbon nanofibers towards reinforcement of high-performance cementitious pastes. Hybrid reinforcement systems comprising optimum volume fraction of carbon nanofibers and micro-scale fibers were also evaluated in cementitious matrices. The improvements in nanofiber dispersion and interfacial interactions resulting from acid-oxidation and use of proper dispersion techniques were found to bring about significant gains in the engineering properties of high-performance cementitious materials.

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Magalhães, A. G., A. T. Marques, F. M. F. Oliveira, P. Soukatchoff, and P. T. de Castro. "Mechanical behaviour of cementitious matrix composites." Cement and Concrete Composites 18, no. 1 (January 1996): 9–22. http://dx.doi.org/10.1016/0958-9465(95)00035-6.

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Kirakevych, Iryna, Myroslav Sanytsky, Orest Shyiko, and Roman Kagarlitsky. "MODIFICATION OF CEMENTITIOUS MATRIX OF RAPID-HARDENING HIGH-PERFORMANCE CONCRETES." Theory and Building Practice 2021, no. 1 (June 22, 2021): 79–84. http://dx.doi.org/10.23939/jtbp2021.01.079.

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The paper presents the results of research concerning the peculiarities of modern High Performance Concretes based on cementitious systems "Portland cement – active mineral additives – micro fillers – superplasticizers – accelerators of hardening". Physico-chemical regularities of structure formation of super plasticized cementitious systems are established. It is shown that the formation of secondary fine ettringite due to the interaction of active alumina with calcium hydroxide and gypsum in the non-clinker part of the binder because of the effect of "self-reinforcement" compensates for shrinkage and increases the strength of the cementitious system. The modification of the cementitious matrix makes it possible to obtain Rapid Hardening High Performance Concretes that provide early loading and turnover of the formwork of monolithic constructions.

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Zhang, Peng, Yonghui Yang, Juan Wang, Meiju Jiao, and Yifeng Ling. "Fracture Models and Effect of Fibers on Fracture Properties of Cementitious Composites—A Review." Materials 13, no. 23 (December 2, 2020): 5495. http://dx.doi.org/10.3390/ma13235495.

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Cementitious composites have good ductility and pseudo-crack control. However, in practical applications of these composites, the external load and environmental erosion eventually form a large crack in the matrix, resulting in matrix fracture. The fracture of cementitious composite materials causes not only structural insufficiency, but also economic losses associated with the maintenance and reinforcement of cementitious composite components. Therefore, it is necessary to study the fracture properties of cementitious composites for preventing the fracture of the matrix. In this paper, a multi-crack cracking model, fictitious crack model, crack band model, pseudo-strain hardening model, and double-K fracture model for cementitious composites are presented, and their advantages and disadvantages are analyzed. The multi-crack cracking model can determine the optimal mixing amount of fibers in the matrix. The fictitious crack model and crack band model are stress softening models describing the cohesion in the fracture process area. The pseudo-strain hardening model is mainly applied to ductile materials. The double-K fracture model mainly describes the fracture process of concrete. Additionally, the effects of polyvinyl alcohol (PVA) fibers and steel fibers (SFs) on the fracture properties of the matrix are analyzed. The fracture properties of cementitious composite can be greatly improved by adding 1.5–2% PVA fiber or 4% steel fiber (SF). The fracture property of cementitious composite can also be improved by adding 1.5% steel fiber and 1% PVA fiber. However, there are many problems to be solved for the application of cementitious composites in actual engineering. Therefore, further research is needed to solve the fracture problems frequently encountered in engineering.

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Aboulela, Amr, Matthieu Peyre-Lavigne, Cédric Patapy, and Alexandra Bertron. "Evaluation of the resistance of CAC and BFSC mortars to biodegradation: laboratory test approach." MATEC Web of Conferences 199 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201819902004.

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Biodeterioration of cementitious materials in sewer networks is a major concern for health and economic reasons. Essentially, it is due to the biological oxidation of H2S into H2SO4 leading to a local progressive dissolution of the cementitious matrix and the precipitation of expansive products likely to provoke cracks. However, it is widely known that CAC has a better performance in such environments but the mechanisms are not very well understood. Nevertheless, previous studies focused mainly on measuring the mass loss of the specimens accompanied with little information on the chemical alteration of the cementitious matrix. This study aims to compare the performance of CAC and BFSC mortars in sewer conditions using laboratory test (BAC-test). Leaching kinetics were evaluated by concentrations measurements of cementitious cations in the leached solutions and of sulphate production by the microorganisms. Moreover, SEM observations coupled with EDS analyses allowed the identification of the chemical alteration of the cementitious matrix.

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Ostertag, Claudia P., and ChongKu Yi. "Quasi-brittle behavior of cementitious matrix composites." Materials Science and Engineering: A 278, no. 1-2 (February 2000): 88–95. http://dx.doi.org/10.1016/s0921-5093(99)00588-2.

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8

Trapko, Tomasz. "Fibre Reinforced Cementitious Matrix confined concrete elements." Materials & Design 44 (February 2013): 382–91. http://dx.doi.org/10.1016/j.matdes.2012.08.024.

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9

Ouyang, C., A. Pacios, and S. P. Shah. "Pullout of Inclined Fibers from Cementitious Matrix." Journal of Engineering Mechanics 120, no. 12 (December 1994): 2641–59. http://dx.doi.org/10.1061/(asce)0733-9399(1994)120:12(2641).

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10

Albahttiti, Mohammed T., Hayder A. Rasheed, Dunja Perić, and Lawrence Davis. "Assessment of wheat fibre reinforced cementitious matrix." IES Journal Part A: Civil & Structural Engineering 6, no. 3 (August 2013): 211–21. http://dx.doi.org/10.1080/19373260.2013.795503.

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11

Feldman, D., F. Denes, Z. Zeng, A. R. Denes, and D. Banu. "Polypropylene fiber–matrix bonds in cementitious composites." Journal of Adhesion Science and Technology 14, no. 13 (January 2000): 1705–21. http://dx.doi.org/10.1163/156856100742500.

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12

Grebenișan, Elvira, Andreea Hegyi, Henriette Szilagyi, Adrian-Victor Lăzărescu, and Brăduț Alexandru Ionescu. "Influence of the Addition of TiO2 Nanoparticles on the Self-Cleaning Performance of Cementitious Composite Surfaces." Proceedings 63, no. 1 (December 21, 2020): 42. http://dx.doi.org/10.3390/proceedings2020063042.

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The presence of TiO2 nanoparticles in a cementitious matrix induces self-cleaning capacity in the presence of UV radiation by combining two mechanisms: surface hydrophilicity and degradation of the stain agent molecules. Experimental results indicate an increase in surface water absorption and, indirectly, in the degree of hydrophilicity, with the increase in the concentration of TiO2 nanoparticles in the matrix. Degradation of organic molecules, rhodamine B, is dependent on the duration of action and intensity of UV rays and the concentration of nanoparticles in the cementitious matrix. An addition of 3–6% TiO2 is effective and sufficient for a good self-cleaning capacity of cementitious surfaces.

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13

Choi, Won-Chang, Seok-Joon Jang, and Hyun-Do Yun. "Interface Bond Characterization between Fiber and Cementitious Matrix." International Journal of Polymer Science 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/616949.

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The use of high performance composite fibers allows for the improvement of the mechanical properties of cement composites. Previous research results indicate that the mechanical properties of such composites are determined predominantly by the interface properties between the fiber and cementitious matrix. Many researchers have conducted single-fiber pull-out tests using cementitious composites to quantify the interfacial properties between the fiber and cement matrix. This paper aims to establish a design methodology that employs coefficients to represent the design parameters for the interfacial properties for three types of fibers: carbon fiber, polypropylene fiber, and twisted wire strand steel cord. The parameters for each type of fiber include the water-to-binder ratio and fiber embedment length. The adopted equation used for the numerical analysis was calibrated using experimental data, and design coefficients are proposed accordingly. The developed models could be validated successfully, and the pull-out characteristics of each fiber type are presented.

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14

Katz, Amnon, Victor C. Li, and A. Kazmer. "Bond Properties of Carbon Fibers in Cementitious Matrix." Journal of Materials in Civil Engineering 7, no. 2 (May 1995): 125–28. http://dx.doi.org/10.1061/(asce)0899-1561(1995)7:2(125).

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15

Banholzer, B. "Bond of a strand in a cementitious matrix." Materials and Structures 39, no. 10 (June 23, 2006): 1015–28. http://dx.doi.org/10.1617/s11527-006-9115-y.

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16

Gao, S. L., E. Mäder, and R. Plonka. "Coatings for glass fibers in a cementitious matrix." Acta Materialia 52, no. 16 (September 2004): 4745–55. http://dx.doi.org/10.1016/j.actamat.2004.06.028.

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17

Banthia, Nemkumar, and Jean-Francois Trottier. "Deformed steel fiber—cementitious matrix bond under impact." Cement and Concrete Research 21, no. 1 (January 1991): 158–68. http://dx.doi.org/10.1016/0008-8846(91)90042-g.

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18

Yu, Jing, Hedong Li, Christopher K. Y. Leung, Xiuyi Lin, Jeffery Y. K. Lam, Ivan M. L. Sham, and Kaimin Shih. "Matrix design for waterproof Engineered Cementitious Composites (ECCs)." Construction and Building Materials 139 (May 2017): 438–46. http://dx.doi.org/10.1016/j.conbuildmat.2017.02.076.

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19

Singh, Sehaj, Arun Shukla, and Richard Brown. "Pullout behavior of polypropylene fibers from cementitious matrix." Cement and Concrete Research 34, no. 10 (October 2004): 1919–25. http://dx.doi.org/10.1016/j.cemconres.2004.02.014.

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20

Hegyi, Andreea, Adrian-Victor Lăzărescu, Henriette Szilagyi, Elvira Grebenişan, Jana Goia, and Andreea Mircea. "Influence of TiO2 Nanoparticles on the Resistance of Cementitious Composite Materials to the Action of Bacteria." Materials 14, no. 5 (February 25, 2021): 1074. http://dx.doi.org/10.3390/ma14051074.

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The formation of biofilms on cementitious building surfaces can cause visible discoloration and premature deterioration, and it can also represent a potential health threat to building occupants. The use of embedded biofilm-resistant photoactivated TiO2 nanoparticles at low concentrations in the cementitious composite matrix is an effective method to increase material durability and reduce maintenance costs. Zone of inhibition studies of TiO2-infused cementitious samples showed efficacy toward both Gram-negative and Gram-positive bacteria.

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21

Sanytsky, Myroslav, Tetiana Kropyvnytska, Stanislav Fic, and Hanna Ivashchyshyn. "Sustainable low-carbon binders and concretes." E3S Web of Conferences 166 (2020): 06007. http://dx.doi.org/10.1051/e3sconf/202016606007.

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Sustainable development depends on a consistency of interests, social, ecological and economic, and that the interests are evaluated in a balanced manner. In order to reduce CO2 emissions, the conception of decreasing clinker factor and increasing the role of supplementary cementitious materials (SCMs) in the cementitious materials has high economical and environmental efficiency. The performance of clinkerefficient blended cements with supplementary cementitious materials were examined. The influence of superfine zeolite with increased surface energy on the physical and chemical properties of low-carbon blended cements is shown. Increasing the dispersion of cementitious materials contributes to the growth of their strength activity index due to compaction of cement matrix and pozzolanic reactions in unclincker part. In consequence of the early structure formation and the directed formation of the microstructure of the cement matrix is solving the problem of obtaining clinker-efficient concretes. Shown that low-carbon blended cements with high volume of SCMs are suitable, in principle, for producing structural concretes.

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22

LEITE, A. M., and A. L. de CASTRO. "Influence of the cementitious matrix on the behavior of fiber reinforced concrete." Revista IBRACON de Estruturas e Materiais 13, no. 3 (June 2020): 543–62. http://dx.doi.org/10.1590/s1983-41952020000300006.

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Abstract One of the main purposes of the addition of fibers to the concrete is the control of the plastic shrinkage cracking in the fresh state and the increase of the post-crack resistance in the hardened state. The cementitious matrix is one of the factors that influences the performance of fiber reinforced concrete, interfering in the fluidity of the mixture and in the adhesion between fiber and matrix. In this context, the present paper evaluates the behavior of two concrete, one of conventional strength and another of high-strength, without fiber and with a content of 1%, by volume, of fiber, being used steel fiber and macro-polymeric fiber. For this, the mechanical properties of the concrete were evaluated in the hardened state by the tests of compressive strength, Barcelona, flexure of prisms and punching of plates. From the experimental results, statistically analyzed, there were significant changes in toughness and residual strength due to change in the cementitious matrix. Finally, an equivalence of performance between the fibers as to the toughness was observed, with the change of the cementitious matrix.

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23

Krivenko, Pavlо, Hai Lin Cao, Lu Qian Weng, and Еlena Kаvalerova. "Mineralogical Aspects of Durable Geocement Matrix Formation - Role of Alkali." Advanced Materials Research 1004-1005 (August 2014): 1523–30. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.1523.

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Less than half a century ago just an idea of presence of free alkalis in a ceramic matrix was considered by ordinary Portland cement people as an absurd one and this was a basic postulate accepted in chemistry of cements. In 1957 a scientist from Ukraine (USSR) Viktor Glukhovsky put forward an assumption which was taken as a base for development and bringing into practice of construction a principally new class of cementitious materials which first appeared in the field under a name of alkaline (now also known under a general name of alkali-activated) cementitious materials. A validity of these ideas was confirmed by more than 50 years of evolutional development and vast experience collected on practical use of new materials in different applications. The paper covers theoretical views on role played by alkali in the formation of an alkali-activated cement matrix with high durability. Examples of compositional build-up of the alkali-activated cementitious materials vs. quantity of added alkali and type of aluminosilicate component are reported together with results of 50-year experience obtained from observation of concrete structures made from these cements.

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Mármol, Gonzalo, Holmer Savastano, Mercedes Bonilla, M. V. Borrachero, J. M. Monzó, Lourdes Soriano, and Jordi Payá. "Ternary Blended Cementitious Matrix for Vegetable Fiber Reinforced Composites." Key Engineering Materials 668 (October 2015): 3–10. http://dx.doi.org/10.4028/www.scientific.net/kem.668.3.

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The present work analyses the behaviour of different binder matrices in order to implement the addition of paper pulp as reinforcement for cementitious composites and assesses the composites flexural properties with time. To prevent microfibers degradation in high-alkaline environments, lower alkaline matrices may be developed. In the present study ternary binder matrices containing ordinary Portland cement (OPC), gypsum (G) and fluid catalytic cracking catalyst residue (FC3R) are presented for that purpose. To assess the performance of the alternatives matrices, pH and conductivity evolution with time were monitored. Also flexural tests were carried out with the intention of evaluate the efficiency of the matrix to preserve fibres within the composite. According to pH and conductivity results is proved that this ternary system offers lower values at early stages (at 3 days) when compared to OPC systems. This inferior alkalinity might be associated to the better mechanical performance with time of the composites when the ternary matrix is used. After 10 months ageing, all the mechanical properties were higher when compared to composites using OPC. Particularly remarkable is the preservation after ageing of the specific energy and deflection at the modulus of rupture when the low-alkalinity matrices were employed, on the contrary what occurred with samples containing OPC where specific energy and deflection were nearly disappeared.

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Denes, F., D. Feldman, Z. Q. Hua, Z. Zheng, and R. A. Young. "Cementitious-matrix composites from SiCl4-plasma-activated polypropylene fibres." Journal of Adhesion Science and Technology 10, no. 1 (January 1996): 61–77. http://dx.doi.org/10.1163/156856196x00454.

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26

Khabaz, Amjad. "Performance evaluation of corrugated steel fiber in cementitious matrix." Construction and Building Materials 128 (December 2016): 373–83. http://dx.doi.org/10.1016/j.conbuildmat.2016.10.094.

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Amar, Mouhamadou, Mahfoud Benzerzour, Amine El Mahdi Safhi, and Nor-Edine Abriak. "Durability of a cementitious matrix based on treated sediments." Case Studies in Construction Materials 8 (June 2018): 258–76. http://dx.doi.org/10.1016/j.cscm.2018.01.007.

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De Nardi, Cristina, Diane Gardner, and Anthony Duncan Jefferson. "Development of 3D Printed Networks in Self-Healing Concrete." Materials 13, no. 6 (March 14, 2020): 1328. http://dx.doi.org/10.3390/ma13061328.

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This paper presents a new form of biomimetic cementitious material, which employs 3D-printed tetrahedral mini-vascular networks (MVNs) to store and deliver healing agents to damage sites within cementitious matrices. The MVNs are required to not only protect the healing agent for a sufficient period of time but also survive the mixing process, release the healing agent when the cementitious matrix is damaged, and have minimal impact on the physical and mechanical properties of the host cementitious matrix. A systematic study is described which fulfilled these design requirements and determined the most appropriate form and material for the MVNs. A subsequent series of experiments showed that MVNs filled with sodium silicate, embedded in concrete specimens, are able to respond effectively to damage, behave as a perfusable vascular system and thus act as healing agent reservoirs that are available for multiple damage-healing events. It was also proved that healing agents encapsulated within these MVNs can be transported to cracked zones in concrete elements under capillary driving action, and produce a recovery of strength, stiffness and fracture energy.

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Fares, Galal, Rajeh Z. Al-Zaid, Amir Fauzi, Abdulrahman M. Alhozaimy, Abdulaziz I. Al-Negheimish, and M. Iqbal Khan. "Performance of optimized electric arc furnace dust-based cementitious matrix compared to conventional supplementary cementitious materials." Construction and Building Materials 112 (June 2016): 210–21. http://dx.doi.org/10.1016/j.conbuildmat.2016.02.068.

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Tian, He, Yi Xia Zhang, and Chun Hui Yang. "Numerical Modelling of Mechanical Behaviour of Fibre Reinforced Cementitious Composites." Applied Mechanics and Materials 846 (July 2016): 139–44. http://dx.doi.org/10.4028/www.scientific.net/amm.846.139.

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In this paper, a new numerical model is developed to model the tensile behavior of the cementitious composites reinforced with hybrid bagasse fibres and steel fibres based on the extended finite element method. The numerical model considers random fibre distribution, which is generated automatically, and the cohesive behavior, which represents the bonding between fibres and the matrix. The cementitious matrix is modeled using extended finite element method. The developed numerical model is implemented in commercial software ABAQUS and the computed results are compared with the corresponding experimental results for numerical validation. It is found that the tensile behavior of the composites predicted from the new numerical model is consistent with that obtained from experimental study, and that the developed numerical model can accurately predict the uniaxial tensile behavior, including the post-cracking behavior of fibre reinforced cementitious composites.

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Incerti, Andrea, Mattia Santandrea, Christian Carloni, and Claudio Mazzotti. "Destructive In Situ Tests on Masonry Arches Strengthened with FRCM Composite Materials." Key Engineering Materials 747 (July 2017): 567–73. http://dx.doi.org/10.4028/www.scientific.net/kem.747.567.

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In the last few decades, fiber reinforced polymer (FRP) composites have been widely employed in several strengthening and rehabilitation applications of existing masonry buildings. Fiber reinforced cementitious matrix (FRCM) composites are a newly-developed strengthening technique comprised of high strength fibers embedded in a cementitious matrix. FRCMs usually offer several advantages such as the high resistance to fire and high temperatures or vapor permeability with masonry substrate, therefore they appear to be a promising alternative to traditional FRP strengthening systems. In this experimental work, the results of destructive in situ tests performed on existing masonry arches strengthened with FRCM composites are reported. FRCM strips consist of a balanced bi-axial mesh made of basalt fibers embedded in a cementitious grout. Three different configurations of the strengthening system have been considered. Load responses and failure modes are presented.

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Metaxa, Zoi S., Athanasia K. Tolkou, Stefania Efstathiou, Abbas Rahdar, Evangelos P. Favvas, Athanasios C. Mitropoulos, and George Z. Kyzas. "Nanomaterials in Cementitious Composites: An Update." Molecules 26, no. 5 (March 6, 2021): 1430. http://dx.doi.org/10.3390/molecules26051430.

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This review is an update about the addition of nanomaterials in cementitious composites in order to improve their performance. The most common used nanomaterials for cementitious materials are carbon nanotubes, nanocellulose, nanographene, graphene oxide, nanosilica and nanoTiO2. All these nanomaterials can improve the physical, mechanical, thermal and electrical properties of cementitious composites, for example increase their compressive and tensile strength, accelerate hydration, decrease porosity and enhance fire resistance. Cement based materials have a very complex nanostructure consisting of hydration products, crystals, unhydrated cement particles and nanoporosity where traditional reinforcement, which is at the macro and micro scale, is not effective. Nanomaterials can reinforce the nanoscale, which wasn’t possible heretofore, enhancing the performance of the cementitious matrix.

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Yazdanbakhsh, Ardavan, Zachary Grasley, Bryan Tyson, and Rashid Abu Al-Rub. "Challenges and Benefits of Utilizing Carbon Nanofilaments in Cementitious Materials." Journal of Nanomaterials 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/371927.

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Carbon nanofibers/tubes (CNF/Ts) are very strong and stiff and as a result, are expected to be capable of enhancing the mechanical properties of cementitious materials significantly. Yet there are practical issues concerning the utilization of CNF/Ts in cementitious materials. This study summarizes some of the past efforts made by different investigators for utilizing carbon nanofilaments in cementitious materials and also reports recent experimental research performed by the authors on the mechanical properties of CNF-reinforced hardened cement paste. The major difficulties concerning the utilization of CNF/Ts in cementitious materials are introduced and discussed. Most of these difficulties are related to the poor dispersibility of CNF/Ts. However, the findings from the research presented in this work indicate that, despite these difficulties, carbon nanofilaments can significantly improve the mechanical properties of cementitious materials. The results show that CNFs, even when poorly dispersed within the cementitious matrix, can remarkably increase the flexural strength and cracking resistance of concrete subjected to drying conditions.

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Zheng, Xuan, Jun Zhang, and Zhenbo Wang. "Effect of multiple matrix cracking on crack bridging of fiber reinforced engineered cementitious composite." Journal of Composite Materials 54, no. 26 (May 4, 2020): 3949–65. http://dx.doi.org/10.1177/0021998320923145.

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In the present paper, a modified micromechanics based model that describes the crack bridging stress in randomly oriented discontinuous fiber reinforced engineered cementitious composite is developed. In the model, effect of multiple matrix cracking on fiber embedded length, which in turn influencing fiber bridging in the composite, is taken into consideration. First, crack spacing of high strength-low shrinkage engineered cementitious composite was experimentally determined by photographing the specimen surface at some given loading points during uniaxial tensile test. The diagram of average cracking spacing and loading time of each composite is obtained based on above data. Then, fiber bridging model is modified by introducing a revised fiber embedment length as a function of crack spacing. The model is verified with uniaxial tensile test on both tensile strength and crack opening. Good agreement between model and test results is obtained. The modified model can be used in design and prediction of tensile properties of fiber reinforced cementitious composites with characteristics of multiple matrix cracking.

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Pang, Chao Ming, K. Y. Leung Christopher, and Wei Sun. "Effect of Rubber Particles on Fracture Properties and Microstructure of Matrix for PDCC." Applied Mechanics and Materials 174-177 (May 2012): 1326–32. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1326.

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Non-biodegradable rubber waste from tyres can be employed for the making of pseudo-ductile cementitious composites (PDCC) which requires a matrix of low toughness. In the present study, compressive strength and fracture toughness are measured for cementitious mortar containing small volume of sand, and with or without rubber particles. Also micro-hardness testing, mercury intrusion porosimetry and scanning electron microscopy are performed. According to the test results, the incorporation of 10%~11% rubber particles with average size of 0.4mm or 0.2mm by volume decreases the compressive strength by 40%~60% and the fracture toughness by 10%~40% which makes preparation of PDCC easier. These can be explained by the presence of cracks at the interface between rubber particle and matrix, as well as the increased porosity and specifically the increased content of large capillary pores in the cementitious composites with rubber particles which is considered as solid air-entraining agent. Moreover, there is a more significant increase in the content of capillary pores for composites with small size rubber particles, explaining the lower strength and toughness when these particles are employed.

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Batiston, Eduardo, Paulo Ricardo de Matos, Philippe Jean Paul Gleize, Roman Fediuk, Sergey Klyuev, Nikolai Vatin, and Maria Karelina. "Combined Functionalization of Carbon Nanotubes (CNT) Fibers with H2SO4/HNO3 and Ca(OH)2 for Addition in Cementitious Matrix." Fibers 9, no. 3 (March 1, 2021): 14. http://dx.doi.org/10.3390/fib9030014.

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Acid treatment is commonly used to improve the dispersion of carbon nanotubes (CNT) in a cementitious matrix, but it causes undesired delay on cement hydration kinetics. This work reports a combined CNT functionalization method with H2SO4/HNO3 and Ca(OH)2 for addition in a cementitious matrix. Results showed that the Ca(OH)2 exposure neutralized the active sites generated by acid exposure, compensating the delay in hydration. As a result, CNT exposed to H2SO4/HNO3 for 9 h and further Ca(OH)2 treatment led to equivalent hydration kinetics than un-treated CNT did with improved stability.

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Pellegrino, Carlos, Giorgio Giacomin, and Rafael Alberto Perlo. "Experimental investigation on existing precast prc elements strengthened with cementitious composites." Alternativas 17, no. 3 (February 1, 2017): 65–69. http://dx.doi.org/10.23878/alternativas.v17i3.214.

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A number of experimental investigations on fibre reinforced polymer (FRP), with the aim of understanding their behaviour when applied as strengthening of reinforced concrete elements, are available in the literature but very few information is available on strengthening real-scale elements with cementitious composites. In particular design code formulations are scanty or non-existent.In this study the behaviour of four precast pre-stressed TT beams taken from an existing industrial building was investigated. One of them was considered as control unstrengthened TT beam, whereas the others were strengthened with different techniques, namely with FRP laminates (glued with epoxy resin), carbon fibres with cementitious matrix and steel fibres with cementitious matrix. Each material involved in this study was also mechanically characterized to obtain the main physical properties. Adequate specimens were obtained from the existing TT beam to characterize the concrete and the reinforcing steel bars.

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Karayannis, C. G. "Analysis and Experimental Study for Steel Fibre Pullout from Cementitious Matrices." Advanced Composites Letters 9, no. 4 (July 2000): 096369350000900. http://dx.doi.org/10.1177/096369350000900401.

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A model for the response of steel fibres embedded in a cementitious matrix and subjected to a pullout load, is presented. The pullout behaviour is dictated by the force transmission between fibre and matrix through an interfacial layer surrounding the fibre. Three distinct pullout load - bearing mechanisms are considered. The first one assumes perfect bond between matrix and fibre and is used for the description of the elastic stage when no real “slip” occurs. The second one is a transitional mechanism, which describes the behaviour at the onset of debonding, and the last one is a frictional dynamic pullout mechanism based on the matrix hydration shrinkage and a fibre - matrix misfit consideration. Pullout and pullthrough tests of steel fibres from cementitious matrices are also reported herein in order to investigate experimentally the pullout mechanisms, generate related data and use them complementary to the developed model. An attempt for the validation of the proposed model through comparisons between experimental data and analytical behaviour curves is also included.

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Safaei, Shouresh. "E-glass Coated Fibers in Novel Composite System for Constructional Applications." International Journal of Science and Engineering Applications 10, no. 8 (August 2021): 111–13. http://dx.doi.org/10.7753/ijsea1008.1002.

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Concrete is one of the most applicable materials in construction. But it needs to reinforce with several reinforcement materials especially high performance fibers such as glass fibers to improve its properties. Among glass fibers, E-glass fiber has lower price but degrade in alkaline cementitious matrix. In this investigation for prohibition of E-glass fibers degradation along with better adhesion of E-glass fibers to cementitious matrix a doubled layer composite coating has been used. The first layer is a polysiloxane which it's permeability to water is too low so prevent alkali attack on E-glass fiber. The second layer is polyvinyl acetate (PVAC) having polar groups of acetate, produce calcium acetate in cementitious matrix, which stick firmly to cement. PVAC in alkaline solution can produce polyvinyl alcohol (PVA) which is again sticky to cement. This composite coating applied on E-glass fibers and used to reinforce concrete. The durability of coated fibers was investigated by alkaline stability test and SEM images. Meanwhile for studying adhesion of fibers to concrete pull out characteristics of coated fibers been investigated and compared with bare E-glass reinforced concrete.

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Drechsler, Astrid, Ralf Frenzel, Anja Caspari, Stefan Michel, Matthias Holzschuh, Alla Synytska, Marco Liebscher, Iurie Curosu, and Viktor Mechtcherine. "Surface Modification of Polymeric Fibers to Control the Interactions with Cement-Based Matrices in Fiber-Reinforced Composites." Key Engineering Materials 809 (June 2019): 225–30. http://dx.doi.org/10.4028/www.scientific.net/kem.809.225.

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There is evidence that the fiber-matrix interaction in fiber-reinforced cementitious composites is determined by the wettability and roughness of the fibers. Due to the high ionic strength in the hydrated cement, also the surface charge or acid/base behavior of the fibers is assumed to play a role. To create fibers with alkaline and acidic surface functionalities, water-insoluble poly (vinyl alcohol) fibers were permanently modified by adsorption of various polyelectrolytes. X-ray photoelectron spectroscopy, zeta potential, and contact angle measurements revealed acidic, alkaline or amphoteric fiber surfaces with advancing water contact angles between 34° and 58°. In a first step to study the interaction with cementitious materials, the interaction of these fibers with pore solution (the liquid phase of hydrated cement) and the adsorption of calcium ions on the fiber surface were investigated. The work will be continued by studying the fiber-matrix interaction in cementitious matrices and its influence on the composite strength.

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Halvaei, Mana, Masoud Jamshidi, Masoud Latifi, and Zahra Behdouj. "Performance of Low Modulus Fibers in Engineered Cementitious Composites (ECCs): Flexural Strength and Pull out Resistance." Advanced Materials Research 687 (April 2013): 495–501. http://dx.doi.org/10.4028/www.scientific.net/amr.687.495.

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Cement based materials are brittle in nature. Fibers have been used to improve flexural/tensile behaviors of the cementitious materials from one hundred years ago. Recently, a new generation of high performance fiber reinforced cementitious composites (HPFRCCs) has been introduced by Professor V.C. Li which was called Engineered Cementitious Composite (ECC). ECC showed incredible flexural and tensile strengths as it was called as flexible concrete by some researchers. Usually, high modulus fibers have been used in ECCs as reinforcement. In this research, homemade low modulus fibers (acrylic, nylon 66 and polypropylene) were used as reinforcement in ECC. Flexural strength test were performed on the ECC sheets. Also, Pull out test was performed to determine adhesion energy and toughness between the fibers and the matrix. It was found that low modulus fibers caused lower flexural strength and bonding to matrix than PVA fibers. However, they were found as suitable fibers for products with good cost-quality balance especially for construction purposes.

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Katsiki, Antigoni, Tobias Hertel, Tine Tysmans, Yiannis Pontikes, and Hubert Rahier. "Metakaolinite Phosphate Cementitious Matrix: Inorganic Polymer Obtained by Acidic Activation." Materials 12, no. 3 (January 31, 2019): 442. http://dx.doi.org/10.3390/ma12030442.

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This work aims to study an aluminosilicate phosphate cementitious matrix. The cementitious matrix was studied on paste samples. The synthesis of metakaolinite phosphate cement (MKPC) was investigated using calorimetric techniques. A systematic study was performed by emphasizing a broad range of Al/P molar ratios, covering the different behavior of the material to the extremes, as well as the optimum composition. X-ray diffraction and scanning electron microscopy revealed that the final structure was mainly an amorphous network, albeit with some non-reacted phases. The compressive strength was studied on mortars using a cement/sand ratio of 1:3. MKPC specimens with Al/P ratios close to 1/1 showed optimal behavior. MKPCs with Al/P ratios above 1/1 were characterized by high porosity and low strength, whereas MKPCs with Al/P < 1 contained an excess of phosphates. The influence of the Al/P molar ratio on compressive strength was also studied, reaching a maximum of 68 MPa for the optimum composition. Based on the results, MKPC may be a promising candidate for construction purposes.

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D'Antino, Tommaso, Carlo Pellegrino, Christian Carloni, Lesley H. Sneed, and Giorgio Giacomin. "Experimental Analysis of the Bond Behavior of Glass, Carbon, and Steel FRCM Composites." Key Engineering Materials 624 (September 2014): 371–78. http://dx.doi.org/10.4028/www.scientific.net/kem.624.371.

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In recent decades, the construction industry has witnessed a rapid growth of interest in strengthening and retrofitting of existing reinforced concrete (RC) and masonry structures. Fiber reinforced polymer (FRP) composites have gained great popularity, and several studies are now available in the literature on their use in strengthening and retrofit applications. Promising newly-developed composite materials are represented by the so-called fiber reinforced cementitious matrix (FRCM) composites. FRCM composites are comprised of high strength fibers embedded within a cementitious matrix that is responsible for the stress transfer between the existing structure and the strengthening material. FRCM composites are still in their infancy, and very limited results are available in the literature on RC and masonry strengthening applications. This study presents an experimental campaign conducted on different FRCM composites comprised of glass, carbon, or steel fibers embedded within two different cementitious matrices and applied to concrete prisms. The single-lap direct-shear test was used to study the stress-transfer mechanism between the FRCM composite and the concrete substrate. Two different composite bonded lengths were investigated. Debonding occurred at the matrix-fiber interface for some of the composites tested and at the concrete-matrix interface for others. This work contributes to the study of the bond behavior of FRCM composites, which represents a key issue for the effectiveness of FRCM composite strengthening.

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Dong, Fangyuan, Jiangtao Yu, Kaili Zhan, and Zhanhong Li. "Seismic fragility analysis of two-story ultra-high ductile cementitious composites frame without steel reinforcement." Advances in Structural Engineering 23, no. 11 (April 13, 2020): 2373–87. http://dx.doi.org/10.1177/1369433220912350.

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This article numerically studies the seismic vulnerability of the frame structure made of ultra-high ductile cementitious composites without longitudinal and transverse reinforcement. A non-linear finite element model is established with the help of Open System for Earthquake Engineering Simulation and calibrated by shaking table test results on an ultra-high ductile cementitious composite-RC frame whose seismic vulnerable parts were replaced by ultra-high ductile cementitious composites without steel reinforcement. Subsequently, an analysis on the structural seismic vulnerability is performed on pure ultra-high ductile cementitious composite frame structure based on the incremental dynamic analysis method. Finally, a seismic vulnerability matrix of the ultra-high ductile cementitious composite frame under various structural limit states is obtained from seismic fragility curves. Under the major earthquake of magnitude 7.5, the probability of ultra-high ductile cementitious composite frame structure under basically intact, slight damage, moderate damage, serious damage, and collapse is 14.2%, 48.1%, 31.7%, 5.3%, and 0.7%, respectively. The achieved results also demonstrate that the ultra-high ductile cementitious composite frame can satisfy the objectivity of “No collapsed under major earthquake” at least for major earthquakes of magnitude 8. It is demonstrated that the ultra-high ductile cementitious composite frame satisfies three-level performance objectivity stipulated in GB 50011-2010 and, thus, preliminarily verifying the feasibility for constructing structures just using high-performance concrete.

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Hegyi, Andreea, Henriette Szilagyi, Elvira Grebenișan, Andrei Victor Sandu, Adrian-Victor Lăzărescu, and Claudiu Romila. "Influence of TiO2 Nanoparticles Addition on the Hydrophilicity of Cementitious Composites Surfaces." Applied Sciences 10, no. 13 (June 29, 2020): 4501. http://dx.doi.org/10.3390/app10134501.

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The effect of the use of TiO2 nanoparticles in the production of cementitious composites, worldwide already known, represents an area of interest for the development of materials with self-cleaning capacity; antimicrobial, antibacterial, antifungal properties; and to contribute to the reduction of environmental pollution. This paper aims to analyze the influence that TiO2 nanoparticles have on the cementitious matrix regarding hydrophilicity, this being one of the two main parameters of the self-cleaning mechanism. Experimental tests, conducted by using the indirect method of measuring the surface water absorption, indicated that an addition of 3%-6% (relative to the amount of cement) of TiO2 nanoparticles is effective in terms of increasing the surface hydrophilicity of the cementitious composites. An excess of TiO2 nanoparticles in the composite matrix (10% TiO2 nanoparticles relative to the amount of cement) not only does not improve surface performance in terms of hydrophilicity, but also reduces them. However, in practice on a case-by-case basis, an analysis is required regarding the optimal amount of nanoparticles used as an addition in the mix-design of the cementitious materials that are intended to induce the quality of self-cleaning process, depending on the intended use, climate, degree and duration of sunlight, and so on.

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Yuan, Fang, Jinlong Pan, and Christopher KY Leung. "Elastoplastic time history analysis of reinforced engineered cementitious composite or engineered cementitious composite–concrete composite frame under earthquake action." Advances in Structural Engineering 20, no. 4 (June 26, 2016): 491–503. http://dx.doi.org/10.1177/1369433216655809.

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Engineered cementitious composite is a class of high-performance cementitious composites with pseudo-strain hardening behavior and excellent crack control capacity. Substitution of concrete with engineered cementitious composite can greatly reduce the cracking and durability problems associated with low tensile strength and brittleness of concrete and can significantly increase structural seismic resistance. In this article, a pair of beam–column joints with various matrix types has been tested under reversed cyclic loading to study the effect of substitution of concrete with engineered cementitious composite in the joint zone on the seismic behaviors of composite members. After that, a simplified constitutive model of engineered cementitious composite under cyclic loading is proposed, and the structural performance of steel reinforced engineered cementitious composite members is simulated by fiber beam elements. The accuracy of the model is verified with test data. Finally, three frame structures with different matrixes subjected to earthquake actions were numerically modeled to verify the contribution of ductile engineered cementitious composite material to structural seismic resistance. The seismic responses or failure mechanisms, deformation patterns, and energy dissipation capacities for each frame structure are analyzed and compared. The simulation results indicate that the application of engineered cementitious composite can reduce the maximum story drift ratio, and the distributions of the dissipated energy are more uniform along the building height when engineered cementitious composite is strategically used in ground columns and beam–column joints of the frame structure. The seismic performance of the reinforced engineered cementitious composite-concrete composite frame is found to be even better than the frame with all concrete replaced by engineered cementitious composite.

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Zhang, Hui, and Rena Yu. "Inclined Fiber Pullout from a Cementitious Matrix: A Numerical Study." Materials 9, no. 10 (September 26, 2016): 800. http://dx.doi.org/10.3390/ma9100800.

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Al-Lami, Karrar, Tommaso D’Antino, and Pierluigi Colombi. "Durability of Fabric-Reinforced Cementitious Matrix (FRCM) Composites: A Review." Applied Sciences 10, no. 5 (March 2, 2020): 1714. http://dx.doi.org/10.3390/app10051714.

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Strengthening and rehabilitation of masonry and concrete structures by means of externally bonded fabric-reinforced cementitious matrix (FRCM) (also referred to as textile reinforced mortar (TRM)) composites was proposed as an alternative to the use of fiber-reinforced polymer (FRP) composites due to their good mechanical properties and compatibility with the substrate. However, quite limited studies are available in the literature regarding the long-term behavior of FRCM composites with respect to different environmental conditions. This paper presents a thorough review of the available researches on the long-term behavior of FRCM composites. Namely, (i) test set-ups employed to study the FRCM durability, (ii) conditioning environments adopted, and (iii) long-term performance of FRCM and its component materials (mortar and fiber textile) subjected to direct tensile and bond tests, are presented and discussed. Based on the available results, some open issues that need to be covered in future studies are pointed out.

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Elghazy, Mohammed, Ahmed El Refai, Usama Ebead, and Antonio Nanni. "Corrosion-Damaged RC Beams Repaired with Fabric-Reinforced Cementitious Matrix." Journal of Composites for Construction 22, no. 5 (October 2018): 04018039. http://dx.doi.org/10.1061/(asce)cc.1943-5614.0000873.

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Carozzi, Francesca Giulia, Diana Arboleda, Carlo Poggi, and Antonio Nanni. "Direct Shear Bond Tests of Fabric-Reinforced Cementitious Matrix Materials." Journal of Composites for Construction 24, no. 1 (February 2020): 04019061. http://dx.doi.org/10.1061/(asce)cc.1943-5614.0000991.

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Journal articles on the topic 'Cementitious matrix'

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