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Relevant bibliographies by topics / ASTM C1012

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Academic literature on the topic 'ASTM C1012'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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Journal articles on the topic "ASTM C1012"

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Niu, Quan Lin, and Nai Qian Feng. "Effect of Different Mineral Admixtures on Sulfate Attack to Mortars." Key Engineering Materials 405-406 (January 2009): 278–82. http://dx.doi.org/10.4028/www.scientific.net/kem.405-406.278.

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Corrosion resistance coefficient of mortars incorporating different mineral admixtures were tested according to GB2420, and the expansion ratio of mortar bar immersed in 5% Na2SO4 solution was measured according to ASTM C1012. It is shown that all the mineral admixtures, including ground granulated blast furnace slag (SL) fly ash (FA), natural zeolite (NZ) and metakaolin (MK) were effective in decreasing the 15-week expansion and increasing the corrosion resistance coefficient of the specimens immersed in Na2SO4 solution as well.

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Niu, Quan Lin, and Nai Qian Feng. "Inhibiting Effect of Mineral Powder on Sulfate Attack of Cement Mortar." Key Engineering Materials 302-303 (January 2006): 73–78. http://dx.doi.org/10.4028/www.scientific.net/kem.302-303.73.

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ASTM C1012 and GB2420 method were employed to evaluate the inhibiting effect of different mineral admixtures on sulfate attack of cement mortar, and the mass loss of mortar specimens after drying-wetting cycles was measured for comparison. It is shown that all the mineral admixtures, including ground blast furnace slag (SL), fly ash (FA), natural zeolite (NZ) and metakaolin (MK) were effective in decreasing the 15-week expansion and increasing the corrosion resistance coefficient of the specimens immersed in Na2SO4 solution. The wetting and drying test however, showed inconsistent result, as both physical and chemical attack may soon occur due to quick accumulation of sulfate by capillary absorption instead of diffusion mechanism.

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Al-Swaidani, A., S. Aliyan, N. Adarnaly, B. Hanna, and E. Dyab. "Influence Of Volcanic Scoria On Mechanical Strength, Chemical Resistance And Drying Shrinkage Of Mortars." Building Research Journal 61, no. 3 (2014): 143–50. http://dx.doi.org/10.2478/brj-2014-0011.

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Abstract In the study, three types of cement have been prepared; one CEM I type (the control sample) and two blended cements: CEM II/A-P and CEM II/B-P (EN 197-1), each of them with three replacement levels of volcanic scoria: (10 %, 15 %, 20 % wt.) and (25 %, 30 %, 35 % wt.), respectively. Strength development of mortars has been investigated at 2, 7, 28 and 90 days curing. Evaluation of chemical resistance of mortars containing scoria-based cements has been investigated through exposure to 5 % sulphate and 5 % sulphuric acid solutions in accordance with ASTM C1012 & ASTM 267, respectively. Drying shrinkage has been evaluated in accordance with ASTM C596. Test results showed that at early ages, the mortars containing CEM II/B-P binders had strengths much lower than that of the control mortar. However, at 90 days curing, the strengths were comparable to the control mortar. In addition, the increase of scoria significantly improved the sulphate resistance of mortars. Further, an increase in scoria addition improved the sulphuric acid resistance of mortar, especially at the early days of exposure. The results of drying shrinkage revealed that the CEM II/B-P mortar bars exhibited a greater contraction when compared to the control mortar, especially at early ages. However, drying shrinkage of mortars was not influenced much at longer times.

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Hodhod, O. A., and G. Salama. "Developing an ANN model to simulate ASTM C1012-95 test considering different cement types and different pozzolanic additives." HBRC Journal 9, no. 1 (2013): 1–14. http://dx.doi.org/10.1016/j.hbrcj.2013.02.003.

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Barcelo, Laurent, Ellis Gartner, Rémi Barbarulo, et al. "A modified ASTM C1012 procedure for qualifying blended cements containing limestone and SCMs for use in sulfate-rich environments." Cement and Concrete Research 63 (September 2014): 75–88. http://dx.doi.org/10.1016/j.cemconres.2014.05.007.

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Bindiganavile, Vivek, Chi Qian Ou, Zheng Chen, and Yaman Boluk. "Evaluating Sulphate Resistance of Cement-Based Systems by Sulphate Content Determination after Exposure." Key Engineering Materials 711 (September 2016): 1037–44. http://dx.doi.org/10.4028/www.scientific.net/kem.711.1037.

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This paper describes approaches to evaluating the resistance of cement-based composites to sulphate attack. The conventional approach of evaluation by means of measuring expansion is discussed in comparison with the sulphate diffusion, which was quantified as a function of depth. Besides CSA Types GU and HS, a 30:70 blend of fly ash and cement Type GU was also examined. The specimens so produced were immersed in a sulphate solution as per ASTM C1012 and retrieved variously after 7, 14, 28, 56 and 84 days of exposure. As expected, Type HS cement performed best with minimum expansion and sulphate ingress. On the other hand, the Type GU cement showed lower expansion and sulphate ingress in comparison to the fly ash blended binder. Although bearing identical porosity, the blended binder had the smallest median pore size. Therefore, the sulphate ingress and consequent ettringite production likely cracks the blended system more than the other two. Significantly, after longer durations of sulphate exposure, the blended system showed higher tensile strength which implies a healing of cracks through ettringite formation.

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Vargas, Paola, Natalia A. Marín, and Jorge I. Tobón. "Performance and Microstructural Analysis of Lightweight Concrete Blended with Nanosilica under Sulfate Attack." Advances in Civil Engineering 2018 (June 3, 2018): 1–11. http://dx.doi.org/10.1155/2018/2715474.

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The influence of two lightweight aggregates (LWA) on concrete and the effects of cement substitution for nanosilica (NS) on the interfacial transition zone (ITZ) and cementitious matrix of concrete in resistance to attacks by magnesium sulfate (MgSO4) are researched in this work. The aggregates evaluated were perlite, which is a lightweight aggregate of open porous structure, and expanded clay (aliven) with closed porous structure. The variables included in the study were replacement percentage of coarse aggregates by lightweight coarse aggregates (0 and 100% by volume) and replacement percentage of cement by nanosilica (0 and 10% by weight). In the dosage of the mixtures, water/cementitious-material ratio constant of 0.35 was used. The LWA were characterized by XRD, XRF, and SEM techniques. Compressive strength, water absorption, and volume change in magnesium sulfate solution (according to ASTM C1012 for a period of 15 weeks) of lightweight concretes were evaluated. It was found that the nanosilica had effect on refinement in the pore system; however, the main incidence on the compressive strength and durability of lightweight concrete (LWC) was defined by the characteristics of lightweight aggregate used in its preparation.

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Menéndez, Esperanza, Cristina Argiz, and Miguel Ángel Sanjuán. "Coal ash Portland Cement Mortars Sulphate Resistance." Civil Engineering Journal 7, no. 1 (2021): 98–106. http://dx.doi.org/10.28991/cej-2021-03091640.

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Coal fly ash (CFA), coal bottom ash (CBA) are residues produced in thermo-electrical power stations as result of the coal combustion in the same boiler. Therefore, some characteristics of the coal fly ash (CFA) are comparable with those of the coal bottom ash (CBA). Nevertheless, coal bottom ash size is larger than coal fly ash one. Consequently, it was found that it is necessary to grind the coal bottom ash (CBA) to reach a similar size to that one of the CFA. The objective of this paper is to evaluate the performance of Portland cement mortars made with coal fly ash (CFA), coal bottom ash (CBA) or mixes (CFA+CBA), against sulphate attack. The methodology is based on the expansion of slender bars submerged in a sodium sulphate solution (5%) according to the ASTM C-1012/C1012-13 standard. It has been found that mortars elaborated with CEM I 42.5 N (without ashes) presented the largest expansion (0.09%) after a testing period of 330 days. Mortars made with CEM II/A-V exhibited lower expansion (0.03%). Summing up, it can be established that mortar expansion decreases when the coal ash amount increases, independently of the type of coal ash employed. The novelty of this paper relies on the comparison between the performances of Portland cement mortars made with coal fly ash (CFA) or coal bottom ash (CBA) exposed to external sulphate attack. Doi: 10.28991/cej-2021-03091640 Full Text: PDF

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Shi, Jin Song, Bo Yuan, Da Zhang Wang, and Zhe An Lu. "Experimental Study of Bending Toughness on Hybrid Fiber Reinforced Concrete." Applied Mechanics and Materials 327 (June 2013): 201–4. http://dx.doi.org/10.4028/www.scientific.net/amm.327.201.

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In order to investigate the difference of current toughness index standards for fiber reinforced concrete, two main groups of specimens were made to take bending toughness test with the requirements of corresponded standards, loading methods and loading speeds, which are ASTM C1018 in America, ACI 544 and JSCE G552 in Japan. United with software Origin, the load-deflection curves gathered from bending test was calculated with relative standards. The results show that the calculated toughness index value with ASTM C1018-98 in America is more accurate with three grades but the requested deflection of testing is much longer than others while ACI 544 and JSCE G552 in Japan are quite the contrary.

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Kan, Yu Cheng, Hsuan Chih Yang, and Kuang Chih Pei. "Strength and Toughness of Steel Fiber Reinforced Heavy Concrete." Advanced Materials Research 512-515 (May 2012): 2908–13. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2908.

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This paper presents an experimental study dealing with the toughness of heavy concrete based on the ASTM C1018. Mixtures including 0%, 0.5%, 1.0% and 1.5% of steel fiber content by volume are designated, which are developed based on a mixture used in Kuosheng nuclear power plant in Taiwan. Metallic aggregates of iron shots and iron ore take 48.8% by volume in that mixture. Test results reveal that the compressive strength and rupture modulus of heavy concrete turn out higher than those of normal concrete. In addition, flexural toughness of heavy concrete grow with the steel fiber fraction, which is valid and appropriate for construction of shielding structure and spent fuel cask.

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Dissertations / Theses on the topic "ASTM C1012"

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Kruse, Karla Anne. "Characterization of high-calcium fly ash for evaluating the sulfate resistance of concrete." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5489.

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Concrete structures are often exposed to sulfates, which are typically found in groundwater and soils, in agricultural run-off, in industrial facilities, and in other source points. These sulfates may attack concrete and significantly shorten the service life of concrete due to reactions between sulfate ions and concrete constituents. These reactions form expansive and deleterious compounds that lead to cracking and spalling of the concrete. This reaction is a function of the sulfate solution but also the physical, chemical, and mineralogical properties of the cement and supplemental cementitious materials (SCMs). It is widely understood that the addition of some fly ashes, by-products of coal combustion power plants, improve the sulfate resistance of the concrete but some fly ash additions actually reduce the sulfate resistance. This project aims to understand this relationship between fly ash and sulfate resistance. Using sulfate testing results on mortar previously obtained at The University of Texas at Austin, this research evaluated the mineralogical, chemical, and physical characteristics of fly ash and attempted to link these measured characteristics (or combinations thereof) to sulfate resistance of concrete.<br>text

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Book chapters on the topic "ASTM C1012"

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"Sulphate resistance of cements evaluated according to ASTM C1012 and AFNOR P18-837 standards." In Concrete Solutions. CRC Press, 2009. http://dx.doi.org/10.1201/9780203864005-42.

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Sideris, K., and P. Manita. "Sulphate resistance of cements evaluated according to ASTM C1012 and AFNOR P18-837 standards." In Concrete Solutions. CRC Press, 2009. http://dx.doi.org/10.1201/9780203864005.ch36.

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Conference papers on the topic "ASTM C1012"

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RODRIGUEZ JERONIMO, GRACIA, ISABEL MARIA GUERRERO VILCHES, and JOSE RODRÍGUEZ MONTERO. "Valorización como árido reciclado mixto de un residuo de construcción y demolición en la confección de hormigones autocompactantes durables en terrenos con yesos." In HAC2018 - V Congreso Iberoamericano de Hormigón Autocompactable y Hormigones Especiales. Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/hac2018.2018.5318.

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Se ha realizado un estudio con el que se pretende valorizar el residuo de construcción y demolición (RCD) como árido reciclado mixto. Este árido es el de mayor generación en las plantas de reciclaje, pero, hoy por hoy, no se encuentra contemplado su uso para hormigón estructural en la normativa española vigente. En primer lugar, este material se ha ensayado para determinar las propiedades más relevantes relacionadas con su empleo en hormigones, particularmente las que se encuentran limitadas en las normas y algunas otras, con objeto de poder caracterizarlo mejor. Posteriormente, se ha diseñado y confeccionado un hormigón autocompactante empleando la totalidad de este residuo, ajustando la dosificación para conseguir la durabilidad en una clase de IIb de exposición ambiental en conjunción con una agresividad química media (HA-30/AC/12/IIb+Qb). Los requisitos de autocompactabilidad se han logrado elaborando amasadas de prueba con una gama de dosificaciones en torno a la preconizada por Okamura, ajustando la dosis de aditivo SP, la cantidad de fíller calizo comercial y las proporciones de arena y grava, intentando siempre emplear la menor cantidad de fíller y la mayor proporción de grava. En el HAC seleccionado finalmente, se ha determinado su resistencia a compresión y se está sometiendo a ensayos relacionados con su durabilidad, especialmente sobre su comportamiento frente a los sulfatos, por el doble motivo de que el residuo, por un lado, presenta un elevado contenido de yeso y, en consecuencia, podría sufrir expansiones internas destructivas, pero, por otro lado, posee una proporción considerable de material cerámico que, por sus evidentes propiedades puzolánicas, se le reconoce una mejora ante este tipo de sustancias. Con objeto de valorar estos aspectos se está siguiendo la evolución de una serie de probetas del hormigón inmersas en una disolución concentrada de Na2SO4, como especifica la norma ASTM C1012/C1012M, para evaluar la durabilidad de los hormigones ante ambientes sulfáticos. Los resultados obtenidos hasta la fecha permiten afirmar que con este residuo se puede garantizar las plenas características de autocompactabilidad en el hormigón, además se han conseguido excelentes resistencias mecánicas y, sorprendentemente, se perciben bastantes indicios de un comportamiento satisfactorio frente a los sulfatos, tanto internos como procedentes del exterior.DOI: http://dx.doi.org/10.4995/HAC2018.2018.5318

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