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Journal articles on the topic 'Lehigh Portland Cement Company'

Author: Grafiati

Published: 4 June 2021

Last updated: 29 July 2025

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1

Mayowa Ikumapayi, Catherine, and Fakorede Ebenezer Oluwabusuyi. "Quality Assurance of Available Portland Cements in Nigeria." International Journal of World Policy and Development Studies, no. 56 (June 20, 2019): 53–63. http://dx.doi.org/10.32861/ijwpds.56.53.63.

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The notable demand for the want of cement in our time has stimulated increment in cement production and increment in manufacturers to be had in our day. These in turn amongst others have brought about failure of buildings and other construction members. As a result, the need to ensure the quality of available cement in circulation is of utmost paramount. This research work studies the available Portland lime cement of grade 42.5 only, in Nigeria from such company as company A, company B, and company C. The qualities and properties of the Portland lime cement from every of the above-named compa

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Khonjo, Khaidi, Yerzhan Toleuov, Aizere Azbergenova, and Akkumis Urumbayeva. "Study of cement binders applicable for modified cast-in-place concrete." Technobius 2, no. 3 (2022): 0022. http://dx.doi.org/10.54355/tbus/2.3.2022.0022.

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This article presents the results of experimental studies of cement binder from local raw material bases optimal for the production of cast modified concrete (CMC). Having a special self-compacting nature, as well as a sensitive cost-effectiveness for the Kazakhstan concrete mixtures manufacturer, this type of concrete requires the use of cement with stable physical and technical characteristics. The study conducted an analysis of the nomenclature of local bases of cement raw materials, testing for cement fineness of Portland cement PC 400 D20 and compressive strength. It is revealed that in K

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A. Sharif, Salah Farhan. "Influence of Cement Kiln Dust As Partial Replacement on some Properties of Ordinary and White Portland Cement." Tikrit Journal of Engineering Sciences 18, no. 3 (2011): 23–32. http://dx.doi.org/10.25130/tjes.18.3.03.

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Cement Kiln Dust (CKD) is produced as a solid waste with large quantities during manufacturing of Portland cement clinker. The possibility of utilizing CKD as partial replacement for Ordinary Portland Cement (OPC) and White Portland Cement (WPC) produced in factories of the Iraqi cement state company has been examined in this study to fulfil the environmental and economical aims. Different percentages of CKD were blended with OPC and WPC mixes. The results show that the amount of water for normal consistency were increased with about 39 % and 31 % for OPC and WPC blended with 25 % CKD. The set

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Hussein, Maher Taher, Najat O. A. Al-Salahi, and Mohamed Hasabelnaaby Mohamed Hasabelnaaby. "Comparative assessment of natural radionuclides content of cement products from Assiut cement factories, Egypt." University of Aden Journal of Natural and Applied Sciences 26, no. 2 (2022): 259–72. http://dx.doi.org/10.47372/uajnas.2022.n2.a13.

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Cement industry is one of the basic industries that play an important role in the national economy of developing countries. In this study, a comparison between cement products from factories on Assiut, Egypt (Assiut Cement Company (ACC) & Building Materials Industry Company (BMIC)) was presented to evaluate their radiological impact on human health as building materials. Activity concentration of 226Ra 232Th, and 40K in different types of cement products were collected from both factories has been measured using HPGe gamma spectrometry. The results indicated that a highest activity concent

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Aulia Life Rahma Putri and Maharani Ikaningtyas. "Strategi Pemasaran Dalam Mempertahankan Citra Merek Dan Perilaku Konsumen Terhadap Pembelian Produk PT.Semen Indonesia (Persero) Tbk." JOURNAL OF ADMINISTRATIVE AND SOCIAL SCIENCE 5, no. 1 (2023): 198–204. http://dx.doi.org/10.55606/jass.v5i1.927.

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Indonesia's cement industry plays a pivotal role in economic and infrastructural development. PT Semen Indonesia (Persero) Tbk stands out as a leading company in this sector, boasting renowned brands like Semen Gresik, Semen Padang, and Semen Tonasa, producing various types of cement, including Pozzolan Portland Cement (PPC) and Ordinary Portland Cement (OPC). Competing with other major cement players like PT Indocement Tunggal Prakarsa Tbk and PT Holcim Indonesia Tbk, PT Semen Indonesia remains a significant force.This study aims to formulate marketing strategies focusing on maintaining the c

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Ngo Xuan Hung, Tang Van Lam, Boris I. Bulgakov, Olga V. Aleksandrova, and Oksana A. Larsen. "EFINITION OF DEFORMATION OF FINE-GRAINED CONCRETE ON THE BASIS OF SULPHATE-RESISTANT PORTLAND CEMENT." Vestnik MGSU, no. 12 (December 2018): 1499–508. http://dx.doi.org/10.22227/1997-0935.2018.12.1499-1508.

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Introduction. The possibility of determining the relative deformations of fine-grained concretes based on sulfate-resistant cement was formulated by testing samples of gypsum-cement-sand mixture in distilled water in accordance with the requirements of the Vietnamese standard TCVN 6068:2004. Objective - to determine the deformations of fine-grained concrete because of sulfate-resistant Portland cement in accordance with the requirements of the TCVN 6068:2004 standard to assess its resistance to corrosion in an aggressive sulfate medium. Materials and methods. To obtain a gypsum-cement-sand mix

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7

Andrews, Gregg. "Unionizing the Trinity Portland Cement Company in Dallas, Texas, 1934-1939." Southwestern Historical Quarterly 111, no. 1 (2007): 31–49. http://dx.doi.org/10.1353/swh.2007.0065.

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Baryshnikov, Mikhail N. "Cement production in Russia: Stakeholders and effectiveness ofregional business atthe end of the XIX century." Izvestiya of Saratov University. History. International Relations 24, no. 3 (2024): 284–93. http://dx.doi.org/10.18500/1819-4907-2024-24-3-284-293.

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The activities of “Petersburg Company for the production of Glukhoozersky Portland cement and other building materials” between 1879 and 1899, although only a initial period segment in its history, provides a holistic overview of phase that enterprise underwent on their path to becoming a large industrial firm. This study aims to improve and expand knowledge about the capacity and difficulties of industrial company to adapt to market changes and maintain their competitiveness, interregional coherence and organizational flexibility. This article explores changes in ownership and management stru

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9

Baryshnikov, M. N. "Nikolai Kozlovsky and Organization of Cement Production in Russia in Early 20th Century." Nauchnyi dialog 14, no. 2 (2025): 384–404. https://doi.org/10.24224/2227-1295-2025-14-2-384-404.

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This article examines the history of one of Russia’s largest cement companies, the Joint-Stock Company of United Portland Cement Plants “Zhelezo-Cement” and “Volsky D. B. Zeyfert”, focusing on its establishment and operations. The research aims to determine the level of institutional (formal and informal) alignment among stakeholders and its impact on the company’s production, financial, and managerial performance on the eve of and during World War I. The study analyzes the extent to which the company’s economic performance reflected its managerial and financial development strategies. It expl

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M. Gheith, Amin, Hassan K. Abd El-Aziz, and Mohamed A. Badr. "Recycling of Cement Kiln Bypass Dust in the production of Portland Cement and environmental impact, El Arish Cement Company, Sinai - Egypt." Journal of Environmental Sciences. Mansoura University 47, no. 1 (2018): 37–38. http://dx.doi.org/10.21608/joese.2018.149480.

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11

Fedorkin, S., I. Elkina, E. Makarova, and R. Ibragimov. "UTILIZATION OF SLUDGE PRODUCTS OF WASHING OUT OF THE SHARKHINSKY QUARRY IN THE PRODUCTION OF WALL BUILDING MATERIALS." Construction and industrial safety, no. 32 (April 4, 2024): 41–46. http://dx.doi.org/10.29039/2413-1873-2024-32-41-46.

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Abstract. The effect of semi-dry pressing on the strength of samples has been studied. It is shown that the optimal specific pressure for pressing samples from molding mixtures containing 10, 20, 30% slag-portland cement is 30Mpa. With the help of RCCP, static processing of experimental results was carried out and a regression equation was obtained for the dependence of the strength of the samples on the pressing pressure and the content of slag-portland cement in the molding mixture. When examining the microstructure of the samples, it was found that the resulting material is a homogene

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Macleod, Ian, Adrian David Saville, and Theresa Onaji-Benson. "Cementing a place in Africa: PPC’s internationalisation drive." Emerald Emerging Markets Case Studies 13, no. 3 (2023): 1–34. http://dx.doi.org/10.1108/eemcs-04-2023-0113.

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Learning outcomes The study enables students to critique the internationalisation strategy of an African business including elements of macroeconomic analysis, company fit with jurisdictions, non-market strategies and mode of entry. Case overview/synopsis Roland van Wijnen was the chief executive officer of Pretoria Portland Cement Company Limited (PPC), a 130-year-old cement maker based in South Africa. He joined after the business had embarked on an international expansion strategy that had taken the business to countries of Rwanda, the Democratic Republic of the Congo and Ethiopia in a matt

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S. Soulayman and R. El-Khatib. "The Effect of Fuel Emulsion on Fuel Saving in Cement Kilns." Journal of Solar Energy Research Updates 7 (January 20, 2020): 42–51. http://dx.doi.org/10.31875/2410-2199.2020.07.5.

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In this work, the combustion of heavy oil and its emulsions with water, in the cement kilns, was investigated in experiments on an industrial scale. The performance of the cement rotary kilns, used in Tartous Company for cement and construction materials, was studied when they were employed to be operated with heavy fuel oil (HFO) and with the water phase of emulsified heavy oil containing 8 vol. % water and 92 vol. % heavy fuel oil (HFO). The emulsified water/heavy fuel oil (W/HFO) with 8 vol. % of water content showed no separation and contained the smallest and most homogeneous water-in-HFO

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Abou-Elela, Sohair I., and Nabil Abdelmonem. "Utilization of Wastewater from Fertilizer Industry – A Case Study." Water Science and Technology 29, no. 9 (1994): 169–73. http://dx.doi.org/10.2166/wst.1994.0470.

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In-plant control in a superphosphate fertilizer company in Egypt was implemented. The control measures in the plant included utilization of wastewater produced from the scrubbing towers to produce sodium fluorosilicate (Na2SiF6) which is a preservative for Portland cement. Wastewater recovery reduced the pollution amount by 40%. Moreover, it saves almost 600,000 L.E./year. The remained unwanted residue which is a very concentrated highly acidic wastewater was diluted with wasted cooling water in the plant. The proposed study is already implemented and is presently in operation.

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15

Romadlon, Fauzan, Hadi Kurniawan, and Ridho Ananda. "Analysis of Postponement Practice in Cement Supply Chain: A Case Study." Jurnal Ilmiah Teknik Industri 19, no. 2 (2020): 176–85. http://dx.doi.org/10.23917/jiti.v19i2.11343.

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This research focuses on assessing implementing postponement in a cement industry especially for OPC (Ordinary Portland Cement) in Indonesia. The company offers three postponement points; Ciawi and Kampung Rambutan, and Jatiwarna. This research has been done with observational method to map customer condition. Moreover, implementing linear programming model is used to gain optimal solution for allocated truck. The results are, highest proportion of OPC customer is in Jakarta, followed Karawang, and Bogor. The result from linear programming model simulation, Ciawi point is assigned to serve Jak

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Rukia Wambua and Dr. Peter Philip Wambua. "EFFECT OF JOB ROTATION TRAINING TECHNIQUE ON EMPLOYEE PODUCTIVITY AT EAST AFRICAN PORTLAND CEMENT COMPANY, KENYA." International Journal of Management Studies and Social Science Research 07, no. 02 (2025): 298–304. https://doi.org/10.56293/ijmsssr.2025.5535.

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With the unpredictable business environment and intense business competition, organizations are required to reach certain standards by improving their performance to align with such great demands and an abundance of resources such as infrastructures or physical facilities are made meaningless without the support of qualified human resources that directly disrupt the continuity of the business operations. The objective of the study was to assess the effect of job rotation training technique on employee productivity at East Africa Portland Cement PLC at Athi River Kenya. Herzberg two-factor theo

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Ahmed Kadem Abed AL Aboudy, Kareem Hassan Mjali, and Ali Thamer Abdul Ameer. "The Impact of Content Marketing and Brand Experience in Achieving Customer Response: An Exploratory Study of the Opinions of a Sample of Customers of the Southern Cement Company - Ordinary Porttland Cement Product." International Journal of Economics, Commerce, and Management 2, no. 2 (2025): 328–38. https://doi.org/10.62951/ijecm.v2i2.618.

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This research explores the combined effects of content marketing and brand experience on customer response, a relationship that has not been extensively studied in previous research. The study highlights the significance of customer service as a key determinant of business success, emphasizing that when customers feel valued and receive prompt responses from a company, their satisfaction, loyalty, and willingness to engage with the brand increase. The research was conducted on a sample of customers from the General Company for Southern Cement, specifically the Kufa Cement Factory. The study fo

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TAREG, ABDALLA ABDALLA. "EFFECT OF COPPER SLAG ON WORKABILITY AND COMPRESSIVE STRENGTH OF CONCRETE." Seybold Report Journal 18, no. 07 (2023): 2657–69. https://doi.org/10.5281/zenodo.8241087.

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<strong>Abstract</strong> Reduction in cement used in concrete production is an important strategy to reduce non-renewable raw materials used in cement production, such as clay, limestone, and chalk. Reducing the use of cement in the production of clinker can result in a decrease in both energy consumption and  emissions. Furthermore, the process of calcining clay, limestone, and chalk emits carbon dioxide into the atmosphere, a problem that leads to global warming. Conversely, substantial amounts of industrial and agricultural wastes, which have limited alternative use, are being generat

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19

Topič, Jaroslav, Andrej Osvald, Václav Nežerka, et al. "Comparison of Compressive Strength and Young’s Modulus of Cement Samples with Different Types of Aggregate." Key Engineering Materials 677 (January 2016): 207–10. http://dx.doi.org/10.4028/www.scientific.net/kem.677.207.

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Several different types of aggregates were used for production of tested samples, namely: the standard sand of a fraction 0-4 mm, quartz sand of a fraction 0-0.4 mm, finely ground recycled limestone powder of a fraction 0-0.07 mm, finely ground recycled concrete of a fraction 0-0.13 mm (ground by Lavaris Company), and finally crushed bricks of a fraction 2-5 mm. The Portland cement CEM I 42.5 R produced in Radotín was used as a binder. Testing was carried out on prismatic samples of dimensions 40 × 40 × 160 mm. Compressive strength and static Young ́s modulus were measured for individual samp

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Martauz, Pavel, Vojtěch Václavík, and Branislav Cvopa. "The Properties of Concrete Based on Steel Slag as a By-Product of Metallurgical Production." Key Engineering Materials 838 (April 2020): 10–22. http://dx.doi.org/10.4028/www.scientific.net/kem.838.10.

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This article presents the results of research on the use of unstable steel slag with a fraction of 0/8 mm as a 100% substitute for natural aggregate in concrete production. Two types of cements were used for the production of concrete: Portland cement CEM I 42.5N and hybrid cement H-CEMENT. Both of these cements were produced by the company Považská cementárna, a.s., Ladce. The main objective of this study was to assess the suitable type of binder to be combined with unstable steel slag in the production of concrete composite. The prepared concrete was used to test the properties of a fresh

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Seitl, Stanislav, Vlastimil Bílek, Hana Šimonová, and Zbyněk Keršner. "Mechanical and Fatigue Parameters of Two Types of Alkali-Activated Concrete." Key Engineering Materials 665 (September 2015): 129–32. http://dx.doi.org/10.4028/www.scientific.net/kem.665.129.

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The alkali-activated concrete is prepared as a new potential material for the production of concrete elements developed by ZPSV, a. s. company. Note that civil engineering structures are usually made of ordinary Portland cement (OPC) based concrete but today, the cement industry is responsible for emitting between 6% and 7% of all the CO2 emission into the atmosphere. Therefore, it is essential to seek different binders to provide environmental friendly materials. One possible alternative is the application of alkali-activated concrete. The optimal design of concrete mixture was studied in thi

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Ojango, Kevin Ong’are, and Simon M. Onywere. "Cement Dust Spread as Influenced by Wind and Its Impacts on Settlement Patterns and the Biophysical Environment." East African Journal of Environment and Natural Resources 5, no. 2 (2022): 29–50. http://dx.doi.org/10.37284/eajenr.5.2.935.

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Distance between cement factories and human settlements is key to determining the extent to which neighbourhoods are affected by cement dust. A key influencer of settlement patterns is zoned development and physical planning for healthy living. Wind patterns are also a factor in determining the proximity of settlements, an aspect requiring zoned development. This study focuses on cement factories in Athi River Township, established as early as 1933 when there was barely any settlement. They include East African Portland Cement Company (1933), Bamburi (1951), Athi River Mining (1974) and Mombas

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Oluremi, Johnson R., Rafat Siddique, and Ekundayo P. Adeboje. "Stabilization Potential of Cement Kiln Dust Treated Lateritic Soil ." International Journal of Engineering Research in Africa 23 (April 2016): 52–63. http://dx.doi.org/10.4028/www.scientific.net/jera.23.52.

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A dark reddish-brown lateritic soil collected from existing borrow pit abandoned by Reynold Construction Company Ltd behind New WAZOBIA Market on Latitude 08008′N and Longitude 04014′E along Ogbomoso-Ilorin Express road, Ogbomoso, Oyo State. Nigeria was treated with cement kiln dust (CKD), a by-product of long wet kiln, obtained from West African Portland Cement Organisation (WAPCO), Ewekoro, Ogun State, Nigeria, under varying moulding water content.The results show gradual reduction in the plasticity index of the samples, decrease in the maximum dry densities (MDD) with corresponding increase

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Wairimu, Ruth Murunde, and Dr Samson Paul Nyangau. "Generic Strategies and Operational Performance of Manufacturing Cement Companies in Kenya." International Journal of Social Science and Humanities Research (IJSSHR) ISSN 2959-7056 (o); 2959-7048 (p) 1, no. 1 (2023): 332–47. http://dx.doi.org/10.61108/ijsshr.v1i1.33.

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In an organization, performance is affected by various factors. The performance of the cement industry in Kenya has been adversely affected by the challenge of inadequate employee training, inefficiency, not meeting the targets, inadequate employee development and reduced sales volume. Cost leadership, differentiation and focus strategies are used in enhancing the organizational performance. This current study was to determine the influence of generic strategies on performance of manufacturing cement companies in Kenya. The specific objectives were to examine the influence of cost leadership s

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Atela, Nicodemus Ochieng, and Kipkorir Sitienei. "Competitive Strategies and Performance of Selected Cement Companies in Kenya." International Journal of Business Management, Entrepreneurship and Innovation 5, no. 1 (2023): 19–30. http://dx.doi.org/10.35942/jbmed.v5i1.299.

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In an organization, performance is affected by various factors. The performance of the cement industry in Kenya has been adversely affected by the challenge of inadequate employee training, inefficiency, not meeting the targets, inadequate employee development and reduced sales volume. Cost leadership, differentiation and focus strategies are used in enhancing the organizational performance. This current study was to determine the influence of competitive strategies on performance of selected Cement Companies in Kenya. The specific objectives were to examine the influence of cost leadership st

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Matos, Ana Mafalda, Lino Maia, and Joana Sousa Coutinho. "Quartz Powder Valorisation in White Self-Compacting Concrete: Mortar Level Study." Applied Sciences 13, no. 13 (2023): 7652. http://dx.doi.org/10.3390/app13137652.

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Quartz powder (QP) from mining exploration has increased, and valorisation solutions are sought. QP incorporation in structural concrete is an exciting strategy for the growth and sustainable development of the concrete industry, waste management and environmental protection. This work addresses the valorisation of QP from a Portuguese company on powder-type self-compacting concrete for architectural and structural purposes, combining the light colour of quartz with white cement. As such, QP was used as a partial cement replacement, acting as a filler on self-compacting white mortars (SCWM) an

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Antonijevic, Djordje, Dragan Ilic, Vesna Medic, Slobodan Dodic, Kosovka Obradovic-Djuricic, and Zoran Rakocevic. "Evaluation of conventional and digital radiography capacities for distinguishing dental materials on radiograms depending on the present radiopacifying agent." Vojnosanitetski pregled 71, no. 11 (2014): 1006–12. http://dx.doi.org/10.2298/vsp1411006a.

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Bacgroun/Aim. The radiopacity of an endodontic material can considerably vary as measured on film and a digital sensor. Digital radiography offers numerous advantages over convential film-based radiography in dental clinical practice regarding both diagnostic capabilities and postintervention procedures. The aim of this study was to investigate the capacity of conventional and charge-conpled device (CCD) based digital radiography to detect material on radiograph depending on the radio-pacifying agent present in the material. Methods. Experimental cements were formulated by mixing Portland ceme

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Tri, Putri Nilda, Amrina Elita, Rahmayanti Dina, and Shifanof Gilang. "Design of working procedure for handling the breakdown machine in parameter of reaction time based on Jidoka system approach in cement company." MATEC Web of Conferences 204 (2018): 03008. http://dx.doi.org/10.1051/matecconf/201820403008.

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Packaging is not a complementary of the product. Packaging is an interface between producer and consumer in a supply chain. Portland cement is one of the products which is usually distributed in unit packed with bags made of kraft paper. Cement production that done with large capacity machines requires the amount of bag in quantity that much anyway. The production of bag factory in Cement company line 4 ideally could reach 9-10 million bags per month. In fact, the average production of cement bag from January to June 2012 is 6.5 million bags per month. In addition, the average defects of work

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Firdaus, Wd Rizky Awaliah, Erwin Anshari, Wahab, Deniyatno, and Marwan Zam Mili. "Community Assistance in the utilization of Nickel Slag in the Morosi Village." Majalah Pengabdian Indonesia 1, no. 2 (2024): 45–50. http://dx.doi.org/10.69616/maindo.v1i2.15.

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Morosi Village located in Konawe Regency is one of the areas in which there is a nickel processing company. The nickel processing produces solid waste, one of which is nickel slag. The amount of nickel slag is accumulating day by day, because each process of refining one ton of nickel product produces 50 times the solid waste, equivalent to 50 tons. So that from the results of quite a lot of waste, research was carried out to use solid waste as a concrete forming material, either as coarse and fine aggregate, or as a cement mixture. Government Regulation No. 101 of 2014 classifies nickel slag

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Torres Castellanos, Nancy, Janneth Torres Agredo, and Ruby Mejía de Gutiérrez. "Performance under sulfate attack of concrete additioned with fluid catalytic cracking catalyst residue (FCC) and metakaolin (MK)." Ingeniería e Investigación 33, no. 1 (2013): 18–22. http://dx.doi.org/10.15446/ing.investig.v33n1.37661.

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In this work the evaluation of the performance of concrete added with Fluid Catalytic Cracking Catalyst residue (FCC) from a Colombian petroleum company, under sulfate attack, is presented. The results of this concrete are compared with the results of Metakaolin (MK) added concrete. The analysis of the pozzolanic materials included the determination of the particle size, the pozzolanic activity and the chemical and mineralogical composition. Different percentages of FCC were used as Portland cement replacement in proportions of 0, 10, 20 and 30%; similarly concrete added with 20% of MK as repl

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Makwezi, Cynthia, Mlisa Jasper Ndlovu, Loveness Paulos, and Chimumoyo Baya. "The Impact of Employee Engagement on the Perfomance of an Organisation- A Case Study of Pretoria Portland Cement Zimbabwe Limited (PPC)." International Journal of Research and Innovation in Social Science VIII, no. VI (2024): 367–83. http://dx.doi.org/10.47772/ijriss.2024.806028.

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The objective of the paper was to investigate the impact of lack of employee engagement as a major cause for poor performance of the organisation as well as factors that influence employee engagement or disengagement at Pretoria Portland Cement (PPC). This study was geared at assisting PPC management to manage differently for competitive advantage and to lead an engaged workforce that is able to better deal with organisational change and challenges in the future. It also aims to highlight the importance of maintaining a quality work life, by having managers who will nature the employee well-be

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Lee, Jaehyun, Gyuyong Kim, Yongro Kim, Kyungju Mun, and Jeongsoo Nam. "Engineering Properties and Optimal Conditions of Cementless Grouting Materials." Materials 12, no. 19 (2019): 3059. http://dx.doi.org/10.3390/ma12193059.

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This study aims to analyze the engineering properties of cementless grouting materials (CGMs) and derive optimal binder types and compositions that can ensure superior material performance in comparison with ordinary Portland cement (OPC). The presented CGM is an environment-friendly inorganic binder based on ground granulated blast-furnace slag. The material properties of three CGM types with different chemical compositions were evaluated. To assess the possibility of using CGMs in grouting-construction methods, this study followed special grouting-method specifications of the J company in Ko

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Colorado, Henry A., Elkin I. Gutiérrez-Velásquez, and Clem Hiel. "Cantilever creep method for testing ceramic composites and a case study for chemically bonded phosphate ceramic composites reinforced with glass, carbon and basalt fibers, including both experiments and simulations." Journal of Composite Materials 54, no. 20 (2020): 2663–76. http://dx.doi.org/10.1177/0021998320902221.

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This paper presented the cantilever beam experiments and the method for creep in chemically bonded ceramics reinforced with glass, carbon, and basalt unidirectional fibers. The ceramic composite samples were fabricated by mixing wollastonite powder and phosphoric acid, through the resonant acoustic mixing technique. The reinforced fibers were added via pultrusion process. The manufactured materials were exposed to high temperature creep tests at 600, 800 and 1000℃, with an annealing time of 1 h, all in air environment. Some examples of real large-scale structures made manually by a company wer

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Nguyen, Duc Vinh Quang, Olga V. Aleksandrova, and Yuriy M. Bazhenov. "Effect of quartz powder and mineral admixtures on the properties of high-performance concrete." Vestnik MGSU, no. 1 (January 2019): 102–17. http://dx.doi.org/10.22227/1997-0935.2019.1.102-117.

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Introduction. This study focuses on the use of silica fume partially replacing cement with 0, 5, 7.5, 10, 12.5 and 30 % constant replacement of fly ash by weight of cement in concrete. Concrete is probably the most extensively used construction material in the world. But the conventional concrete is losing its uses with time and high-performance concrete (HPC) is taking that place. HPC has superior mechanical properties and durability to normal strength concrete. Because of, the microstructure of HPC is more homogeneous than that of normal concrete (NC) due to the physical and chemical contrib

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Shnaihej, Kareem Th, Shatha F. Khaleel, and Dr Khalid A. Sukkar. "Preparation of Nano Silica particles by laboratory from Iraqi sand and added it to concrete to improve hardness specifications." Journal of Petroleum Research and Studies 9, no. 3 (2019): 36–58. http://dx.doi.org/10.52716/jprs.v9i3.313.

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Concrete is the most common material used for construction purposes as well as in the lining of oil wells. In this work, the concrete specifications are improved through the preparation of Nano silica particles (SiO2) by laboratory from Iraqi sand and added to the concrete, which gives results with a large gap in the test of compressive strength after the addition of silica nanoparticles prepared to the concrete mixtures compared to the same mixtures without the addition of silica, to give high hardness and great capacity for bearing of compressive strength as well as increase the resistance t

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Kapustin, Fedor, and Andrey Vishnevsky. "The Use of Fly Ash in the Production of Concrete and Products Based on it." Solid State Phenomena 309 (August 2020): 8–13. http://dx.doi.org/10.4028/www.scientific.net/ssp.309.8.

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Reftinskaya state district power plant owned by Enel company and located in Russia produces up to 5 million tons of fly ash and slag annually when burning multi-ash coal of the Ekibastuz basin. A new system of dry ash removal works at the power plant; it includes the laying system of wet ashes and slags on the dump and the discharge system from the silo storage facility up to 1 million tons of ash per year. The chemical-mineral and grain composition data, properties and their correspondence to Russian standard 25818 in order to use ash in the production of concrete and products based on it are

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Castillo, Hengels, Thomas Droguett, Mario Vesely, Pamela Garrido, and Sergio Palma. "Simple Compressive Strength Results of Sodium-Hydroxide- and Sodium-Silicate-Activated Copper Flotation Tailing Geopolymers." Applied Sciences 12, no. 12 (2022): 5876. http://dx.doi.org/10.3390/app12125876.

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Geopolymers are created by mixing a source of aluminosilicates, which can be natural or by-products of other industries, with an alkaline solution, which dissolves the aluminates and silicates present in this source, where after a polymerization process, an N-A-S-H gel is formed, which is responsible for providing the properties that characterize geopolymers. Among the variety of existing geopolymers, those based on by-products from other industries stand out since they were demonstrated to be a less-polluting alternative for concrete production than ordinary Portland cement (OPC). Due to the

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Engelhardt, Hans-Joachim, Tilman Fischer, Hannes Räuschel, and Frank Klingner. "BGzEro – backfilling measures with low CO₂ footprint." Safety of Nuclear Waste Disposal 2 (September 6, 2023): 171. http://dx.doi.org/10.5194/sand-2-171-2023.

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Abstract. In Germany, the Federal Company for Radioactive Waste Disposal (BGE) is responsible for the construction and operation of deep, geological repositories. BGE operates the Asse II mine and the Konrad and Morsleben repositories. Initially, these mines were excavated to extract raw materials. As a result, they have large void volumes on multiple levels. The stability of the unfilled cavities is limited in time so that backfilling measures are required for stabilisation. However, there are many requirements to consider when selecting backfill materials. BGE aims at making its locations cl

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U.A., Aliyu O.A.U. Uche A. Mohammed M.T. Abdulwahab. "Influence of Neem Seed Husk Ash (NSHA) on the Strength of Laterized Concrete." NIPES Journal of Science and Technology Research 5, no. 1 (2023): 202–12. https://doi.org/10.5281/zenodo.7731983.

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<em>The processing of neem products from the neem tree generates a considerable amount of waste each year. The purpose of this study is to evaluate the properties of laterised concrete containing neem seed husk ash (NSHA) as an admixture. The neem seed husk was obtained from a neem oil processing company in Katsina – Nigeria, dried and burned in the open air before being calcined in an oven at 650°C to make an ash. X-ray Fluorescence (XRF) was used to analyze the chemical composition of neem seed husk ash. Grade 25 concrete was made with 0, 10, 20, 30, and 40 % by weight of fine aggr

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Junior, John K. Quarm, Charles K. Kankam, Prosper Tudagbe-Obuor, et al. "Strength and Deformational Characteristics of Concrete Beams Reinforced with Steel Bars Locally Produced from Recycled Metal Scrap in Ghana." Journal of Engineering Research and Reports 24, no. 12 (2023): 57–74. http://dx.doi.org/10.9734/jerr/2023/v24i12860.

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This study was conducted to examine the structural behavior of concrete beams reinforced with local steel bars available in Ghana. The concrete was prepared from conventional materials of ordinary Portland-limestone cement, pit sand and granitic stones. Steel bars of sizes 12mm, 10mm, and 8mm from different millers used to reinforce the concrete beams were tested to study the stress-strain relationship of the bars. The main reinforcing steel bars in the concrete beams comprised 12mm high tensile and 12mm mild steel bars produced by four different companies. The four companies from which these

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Jacobs, Trent. "Comments: The Race to Zero: Can Oil and Gas Eliminate Scope 1 Emissions?" Journal of Petroleum Technology 77, no. 02 (2025): 16–18. https://doi.org/10.2118/0225-0016-jpt.

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_ Most of the largest oil and gas companies, along with many service providers, have set their sights on achieving net-zero Scope 1 emissions within the next 15 to 20 years. But when it comes to executing this ambition, the industry faces a simple but intimidating question: Where to begin? Greenhouse gases (GHGs) are woven into every stage of a well’s life which presents challenges that demand creative solutions that do not require too much capital. At the 2024 Abu Dhabi International Petroleum Conference (ADIPEC), a global lineup of operators and service providers shared their answers. More t

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Lay, Vera, Franziska Baensch, Sergej Johann, et al. "SealWasteSafe: materials technology, monitoring techniques, and quality assurance for safe sealing structures in underground repositories." Safety of Nuclear Waste Disposal 1 (November 10, 2021): 127–28. http://dx.doi.org/10.5194/sand-1-127-2021.

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Abstract. Within the project SealWasteSafe, we advance construction materials and monitoring concepts of sealing structures applied for underground disposal of nuclear or toxic waste. As these engineered barriers have high demands concerning integrity, an innovative alkali-activated material (AAM) is improved and tested on various laboratory scales. This AAM has low reaction kinetics related to a preferential slow release of the heat of reaction in comparison to alternative salt concretes based on Portland cement or magnesium oxychloride cements. Hence, crack formation due to thermally induced

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"Capital Structure Trends in a Cement Engineering Company." International Journal of Recent Technology and Engineering 8, no. 6 (2020): 2001–5. http://dx.doi.org/10.35940/ijrte.f8101.038620.

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Capital structure means the mix of equity and debt. The Finance manger is required to bring balance between different sources of financial resources for maximising return in any company by not altering risk mix. A best capital structure is required to optimize the owner’s Profits in any company. In this research paper, effort is put to examine the capital structure Trends in a Cement Engineering Company namely The Ramco Cements Limited. The Ramco Cements Limited is a main company in Ramco Group. This is a most popular group in Southern India. It is mainly located in Chennai. The important prod

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Barger, Gregory S., Mark R. Lukkarila, David L. Martin, et al. "EVALUATION OF A BLENDED CEMENT AND A MINERAL ADMIXTURE CONTAINING CALCINED CLAY NATURAL POZZOLANS FOR HIGH PERFORMANCE CONCRETE." Proceedings of the International Conference on Concrete Pavements, January 4, 2025. https://doi.org/10.33593/iccp.v6i1.678.

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A blended cement system (Duracem™) meeting the requirements of ASTM C 595 (IP, IPMS) and C 1157 (GU, MS AND HS) was developed and commercially produced in 1993 by Ash Grove Cement Company in its efforts to address the durability problems related to alkali-silica reactivity (ASR) and sulfate attack in concrete pavement. The cement product is manufactured by combining a calcined clay manufactured pozzolan, gypsum and Portland cement. In 1995 the mineral admixture (Durapoz™) which meets ASTM C 618 was produced and subsequently introduced into the market. Careful selection of the raw clay material

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Costa, Hugo, Ricardo do Carmo, Tiago Rodrigues, Ana Rodrigues, and Eduardo Júlio. "Development of eco ultra‐high performance concrete for the prefabrication of ultra‐thin concrete shells." Structural Concrete, March 25, 2025. https://doi.org/10.1002/suco.202400588.

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AbstractThe present study focuses on the development of an eco‐UHPC to be used in a prefabrication company to produce ultra‐thin concrete shells. The composition targeted a strong (up to 50%) reduction of the Portland cement content, with a partial replacement of the latter by different cementitious additions, combined with limestone filler. The studied parameters also included the type and dosage of the reinforcing fibers and the size and type (natural or lightweight) of the aggregates. In this scope, different eco‐UHPCs were produced and characterized, considering both mechanical and durabil

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Nwaobakata, C., and B.D Eme. "Effect of Almond Ash as Partial Replacement of Cement Filler on the Performance of HMA." International Research Journal of Advanced Engineering and Science 3, no. 4 (2018). https://doi.org/10.5281/zenodo.2539332.

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<em>Several of the newly constructed highway pavements in Nigeria have shown early failures with far-reaching negative impacts on both roadway safety and economy. Major types of these failures are permanent deformation (rutting) and cracking. Fillers were not used as a result of high cost and scarcity of conventional fillers. The objective of this study is to evaluate the influence of new different fillers extracted from different local sources on the performance of asphalt mixtures. The effect of partial replacement of conventional and content on the failures potential of asphalt concrete as

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WATIRI, LILIAN. "INFLUENCE OF SUPPLY CHAIN MANAGEMENT PRACTICES ON COMPETITIVE ADVANTAGE IN CEMENT MANUFACTURING INDUSTRY: A CASE OF EAST AFRICA PORTLAND CEMENT COMPANY LIMITED." Strategic Journal of Business & Change Management 4, no. 2 (2017). http://dx.doi.org/10.61426/sjbcm.v4i2.443.

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Dimbimalala Mavoniaina RATSARAHASINA, Hery Mikaela RATSIMBAZAFY, and Jean de Dieu RAMAROSON. "TESTING OF OVERSULFATED CEMENT BASED ON NATURAL POUZZOLANE." EPRA International Journal of Multidisciplinary Research (IJMR), February 23, 2021, 176–83. http://dx.doi.org/10.36713/epra6394.

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Currently, cement plants face a major environmental problem due to greenhouse gas emissions during the production of Portland clinker. In order to mitigate this negative impact on the environment, this study aims to partially or completely replace conventional cement with a new type of cement that has properties similar to conventional cements. To enhance local mineral resources, the use of natural pouzzolane is adopted. As this binder is obtained by a mixture of activated natural pouzzolane, gypsum, lime and a small amount of conventional cement, the work is to determine the optimal parameter

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RONO, JOHN KIPYEGON. "EFFECT OF GROWTH STRATEGIES ON THE COMPETITIVENESS OF FIRMS IN KENYAN CEMENT INDUSTRY: A CASE STUDY OF EAST AFRICAN PORTLAND CEMENT COMPANY LIMITED." Strategic Journal of Business & Change Management 2, no. 2 (2015). http://dx.doi.org/10.61426/sjbcm.v2i2.189.

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Aina, Kehinde. "Influences of cement brands and mixing ratios on the physico-mechanical properties of cement bonded particleboards made of wood particles of Gmelina arborea, Afzelia africana and Triplochiton scleroxylon." BALTIC FORESTRY 28, no. 1 (2022). http://dx.doi.org/10.46490/bf581.

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Cement bonded particleboards (CBPs) were produced of wood particles of Gmelina arborea, Afzelia africana and Triplochiton scleroxylon using two brands of ordinary portland cement manufactured by two different domestic cement companies operating in Nigeria known as Dangote PLC and Lafarge Company. The admixture of wood particles and cement for production of the CBPs were done at mixing ratios of 1:1, 1:1.5 and 1:2 (weight to weight basis). The properties such as water absorption and thickness swelling at 24 hours, density, modulus of rupture (MOR), modulus of elasticity (MOE) and impact bending

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