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class="page-name-block-text">Papers by Keyword: Cement</h1> </div> <div class="papers-author-content"> <div class="block-search-pagination"> <div class="pagination-container"><ul class="pagination"><li class="active"><span>1</span></li><li><a href="/paper-keyword/cement/2">2</a></li><li><a href="/paper-keyword/cement/3">3</a></li><li><a href="/paper-keyword/cement/4">4</a></li><li><a href="/paper-keyword/cement/5">5</a></li><li class="PagedList-ellipses"><a class="PagedList-skipToNext" href="/paper-keyword/cement/6" rel="next">…</a></li><li class="PagedList-skipToNext"><a href="/paper-keyword/cement/2" rel="next">></a></li><li class="PagedList-skipToLast"><a href="/paper-keyword/cement/46">>></a></li></ul></div> </div> <div class="block-volume-title normal-text-gray"> <p> Paper Title<span>Page</span> </p> </div> <div class="item-block"> <div class="item-link"> <a href="/JERA.71.31">Evaluation of the Performance of Fiber-Reinforced Mortars Based on Dredged Sludge</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Salhi Mohamed, Benyahia Amar, Alex Li, Toufik Boubekeur, Ashraf Ashour, Choucha Said </div> </div> <div id="abstractTextBlock605444" class="volume-info volume-info-text volume-info-description"> Abstract: River-carried solids, especially during floods, lead to dam sedimentation. Dredging extends dam life, but excess unusable sediment storage threatens the environment. The aim of this work is to investigate the influence of the recovery of calcined mud from Chorfa dam on the physico-mechanical and chemical characteristics of mortars fiber bundles. The sludge is used as a partial substitute for cement by volume at rates of 10%, 15%, 20% and 25%. All test specimens had water / binder (W/B) ratio and steel fibers ratio. Testing programme included measuring the fluidity, ultrasonic pulse velocity test, dynamic modulus of elasticity, flexural and compressive strengths. Compared to the control mortar, the fluidity represented by the diameter of M0, M15 and M25 mixtures decreased by approximately 11%, 14% and 22%, respectively. The compressive strength of M15 increased by 17.4% at 28 days, compared with the control specimen. At 7 days, the ultrasonic speed of the M25 mixture decreases by 1.7% compared to that of M15. The dynamic modulus of elasticity of M20 and M25 increases by 13% and 12% as the age ranges from 2 to 28 days. At 28 days, the flexural strength of the M20 blends increased by approximately 64%. </div> <div> <a data-readmore="{ block: '#abstractTextBlock605444', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 31 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/KEM.986.83">Characterization of Phosphogypsum for Potential Uses in Soil Stabilization</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Doszhan Temirbekov, Chang Seon Shon, Islambek Manap, Do Kyum Kim, Hong Seop Kim, Jong Ryeol Kim </div> </div> <div id="abstractTextBlock613040" class="volume-info volume-info-text volume-info-description"> Abstract: This research investigated the influence of phosphogypsum (PG) addition to mortar mixture and determined the possibility of utilizing PG in soil stabilization. Originally, the chemical composition and mineralogy of the PG were determined using X-ray fluorescence (XRF) and X-ray diffraction (XRD) tests. The principal constituent of PG becomes calcium sulfate hemihydrate with the presence of some impurities. A total of 9 mixes have been developed: A plain mortar mix is a comparative base, and the other 4 mixes are with 5, 10, 15, and 20 % cement replacement with PG for each type (fresh and stockpiled PG called PGF and PGS, respectively). The experimental program focuses on analyzing the effects of PG on setting time, hardened density, compressive strength, and water expansion of mortar mixtures before its soil stabilization application. Test results indicate that with higher PG, the setting time of the mortar mix is delayed except for the mixture with 20% PG, which experienced an early false set. The results of the compressive strength tests revealed that the 5% PG mixes exhibited higher values compared to the control mix, starting from the 28-day curing period, regardless of PG type. Although the higher PG content and compressive strength lowered, the expansion levels were very low based on the ASTM C 1260 limits for all mixtures, excluding heaving risks. </div> <div> <a data-readmore="{ block: '#abstractTextBlock613040', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 83 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/AST.152.73">Geochemical and Experimental Investigations of some Egyptian Volcanic Tuffaceous Rocks as Natural Supplementary Cementitious Materials</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Ramadan E. El-Shafey, Mohamed Heikal, Hatem El-Dsoky, Gehad Mohamed Saleh, Ahmed Abubakr Omar </div> </div> <div id="abstractTextBlock611021" class="volume-info volume-info-text volume-info-description"> Abstract: Supplementary cementitious materials are additives that are used to improve the qualities of Portland cement while also reducing its environmental impact. The production of such blended cements relies on the regional availability of additional components. Despite the prevalence of volcanic tuffs in the Eastern Desert and South Sinai encountered in Egypt, there is a scarcity of knowledge regarding experimental research on cement manufacture. The main objective of this study is to analyze the geochemical and experimental characteristics of several volcanic tuffaceous rocks exploited as natural additional cementitious materials and their impact on the characteristics of the resulting blended cement. The partially replacement can play an important role in reducing the local environmental impacts (CO<sub>2</sub> emissions). Various volcanic rock specimens have been collected from the Sinai (Wadi Kid) and the Eastern Desert (Gabal Umm Zarabit, Wadi Umm Khariga, Gabal Igla El-Iswid, and Abu Wassat), Egypt. The samples under study were examined for their mineralogy, petrography, and chemical composition in order to identify their specifications. In addition, a total of fifteen blended cement samples were produced by partially replacing clinker with the investigated samples. The substitution ratios used were 10%, 20%, and 25% by mass. A control mix was also designed, consisting of ordinary Portland cement without any other substances. An assessment has been conducted on the effects of partially replacing clinker with volcanic rocks on the characteristics of the resulting blended cement. The physico-mechanical parameters, including Blaine, setting time, flexural strength, and compressive strength, of the hardened blended mortars were measured at specific times (7 and 28 days). The study demonstrated that the strength of the studied blended cement mixes decreased as the fraction of the examined volcanic rocks to clinker ratio increased throughout the early stages. The highest compressive strength among the mixtures evaluated was achieved when using a 10% ratio of volcanic rocks as clinker replacement. </div> <div> <a data-readmore="{ block: '#abstractTextBlock611021', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 73 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/KEM.980.129">Development and Characterization of a Micro-Concrete Based on Wood Waste from Sawmills</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Rachel Raïssa Ngono Mvondo, René Oum Lissouck, Sophie Grigoletto </div> </div> <div id="abstractTextBlock597476" class="volume-info volume-info-text volume-info-description"> Abstract: An experimental study was carried out to evaluate the feasibility of using concrete compositions containing waste wood for structural and non-structural building applications. First, the inert and wood aggregates used in the composite design were characterized. Five compositions containing a reference, 50% and 100% of wood particles were then produced and characterized in terms of physical and mechanical performance (e.g., apparent density, abrasion, compressive strength, and flexural strength). The selected specimens were used for additional experimental tests. These included water absorption and thermal tests. Increasing wood waste content considerably lower compressive and flexural strengths while improving the thermal insulation quality of wood waste-cement composite. The durability assessment of selected compositions further showed that the abrasion resistance of manufactured specimen decreased by adding wood waste in the cement matrix while there was an increase of the capillarity absorption coefficients. It appears that the incorporation of waste wood particles into mortars decrease their thermal conductivities to 0.3 W/mK. The use of wood waste treated by a lime solution improves the studied properties. </div> <div> <a data-readmore="{ block: '#abstractTextBlock597476', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 129 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/AST.145.45">Effect of Calcium Nitrate on the Performance of Slag Blended Cement</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Harald Justnes, Tobias Danner, Mehrdad Torabzadegan </div> </div> <div id="abstractTextBlock603022" class="volume-info volume-info-text volume-info-description"> Abstract: Portland cement has been replaced with 50% ground, granulated blastfurnace slag (ggbs) of two types. The influence of 2 and 4% calcium nitrate accelerator on early hydration of such binders was investigated by isothermal calorimetry as well as X-ray diffraction and thermogravimetry. The strength development of mortar based on these binder blends has been followed up to 28 days and the influence of calcium nitrate discussed. One ggbs lower in SiO<sub>2</sub>, A<sub>l2</sub>O<sub>3</sub> and MgO yielded somewhat lower strength (about 90%) than the other. Addition of calcium nitrate led to lower strength at 1 day, but higher strength from 3 days on-wards. The blends with the two ggbs achieved similar strength at 7 and 28 days when blended with 4% calcium nitrate. Calcium nitrate led to more ettringite formation and AF<sub>m</sub> phases (probably nitrate version) at 1-day sealed curing. However, the calcium hydroxide content was reduced. Potential explanations for calcium hydroxide reduction are discussed. </div> <div> <a data-readmore="{ block: '#abstractTextBlock603022', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 45 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/EH.2.3">Environmental Impacts of Cement Production on the Total Nitrogen and Nitrate Distribution of Soil and Dust in Selected Areas around Ewekoro, Ogun State</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Oyetunde Opanike, Kristin Ross, Harriet Whiley, Olugbenga A. Omotosho, Emmanuel O. Akindele, Omolola O. Yusuf </div> </div> <div id="abstractTextBlock599881" class="volume-info volume-info-text volume-info-description"> Abstract: Cement dust is principal industrial waste that exhibits detrimental effects on soil properties especially the nitrogen content of the soil. This study investigated the total Nitrogen and Nitrate value of the soil and dust collected in thirteen (13) different locations around Ewekoro Limestone Quarry and Cement Production. The results showed that the total nitrogen value ranges between 0.093ppm and 0.037ppm while the nitrate value ranged from 145.25ppm - 66.50ppm in the soil samples. Also, the total nitrogen in the dust particulate samples was from 0.950-0.100ppm while the nitrate value ranged from 63.00ppm-28.00pm. The value of total nitrogen value and nitrate around Ewekoro Quarry is relatively lower than the value obtained at Ososun, the control location which is about 10km away from Quarry. Duncann Multiple range tests revealed that soil samples collected from Alaguntan, Ajegunle, Arigbajo, Papa Lanto, Rail km 53, Waasinmi Alaafia, Apomu, Isofin Orile, Quarry, were significantly different in total nitrogen from the control sample (Ososun). In contrast, soil samples collected from Ayepe, Lapeleke, and Agbesi do not differ significantly in total Nitrogen from the soil sample. Also, the result of the correlation matrix indicated that there is a significant positive correlation between total nitrogen, conductivity, and depth at (<0.05), while there is a negative correlation but non-significant relationship between soil depth, pH, clay content, and total nitrogen. It is possible that the reduced level of nitrogen around the quarry location compared with the control site must have been due to the effect of cement duct particulates. </div> <div> <a data-readmore="{ block: '#abstractTextBlock599881', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 3 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/KEM.970.3">Evaluation of the Thermomechanical Response of Geopolymeric Mortars Manufactured from Peruvian Mining Residues and its Comparison with Portland Cement Mortars</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Cris Katherin Palomino-Ñaupa, V.C. Bringas-Rodríguez, F.A. Huamán-Mamani </div> </div> <div id="abstractTextBlock606397" class="volume-info volume-info-text volume-info-description"> Abstract: Geopolymeric mortars made from a mixture of waste from the Peruvian informal mining industry, sodium hydroxide activating solution, and fine sand were studied, comparing them physically and mechanically with conventional Portland cement mortars. Both conventional and geopolymeric mortars were prepared in parallel and then subjected to uniaxial compression tests at various temperatures (ambient, 200 °C and 500 °C). The mechanical results found revealed maximum average resistance values of 63, 84 and 79 MPa for conventional mortars, and 12, 32 and 36 MPa for geopolymeric mortars, when they were tested at room temperature, 200 °C and 500 °C, respectively. The best mechanical results in geopolymeric mortars were found when considering a binder: fine sand ratio of 1:2, molarity of the hardening solution of 12 M and a hardening solution: binder ratio of 0.6. It was possible to demonstrate a good agreement between the distribution of particle sizes observed microstructurally and those found by granulometry studies by laser light diffraction. </div> <div> <a data-readmore="{ block: '#abstractTextBlock606397', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 3 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/KEM.969.87">Laboratory Tests of Low-Strength Mortars for Precast Concrete Buildings Designed for Disassembly</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Philip Skov Halding </div> </div> <div id="abstractTextBlock601141" class="volume-info volume-info-text volume-info-description"> Abstract: Direct reuse of precast concrete elements is possible if disassembly is considered in the design phase. An unusual way of designing for disassembly is to use “wet” joints as usual but to optimise the mortar to be less strong and, therefore, easier to remove at the end of the life of the building. A method is presented to test mortars with lime content to determine the shear capacity in the connection between mortar and concrete. Tests are performed with and without an applied normal force and with and without steel bars through the interface. The results show that applying a lime content to the mortar reduces the compressive strength, shear strength and flexural strength. Using steel bars in the connections increases the ductility from less than 1 mm to several mm at the point of failure. The results can be used in future checks of mortar joints in buildings, where it is required to have a minimum strength during the service life and a maximum strength when dismantling. The future mortar requirements will depend on the disassembly method. </div> <div> <a data-readmore="{ block: '#abstractTextBlock601141', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 87 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/MSF.1100.129">On the Existence of Ternary Compounds in the CaO-BaO-Al<sub>2</sub>O<sub>3</sub> System</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Galina Shabanova, Victoria Taranenkova, Oksana Myrgorod, Oleksandr Pirohov </div> </div> <div id="abstractTextBlock599635" class="volume-info volume-info-text volume-info-description"> Abstract: In this article in order to verify the probability of the formation of the compound CaBaAl<sub>4</sub>O<sub>8</sub>, a thermodynamic analysis of the following possible solid-phase reactions of its formation was carried out: formation of CaBaAl<sub>4</sub>O<sub>8</sub> from the initial components - calcium carbon dioxide, barium carbon dioxide and aluminum oxide; the probability of formation of dual compounds CaAl<sub>2</sub>O<sub>4</sub> and BaAl<sub>2</sub>O<sub>4</sub> from the same raw materials (since the compound CaBaAl<sub>4</sub>O<sub>8</sub> is located on the BaAl<sub>2</sub>O<sub>4</sub>-CaAl<sub>2</sub>O<sub>4</sub> conjugate) and the possibility of formation of the compound CaBaAl<sub>4</sub>O<sub>8</sub> from binary compounds CaAl<sub>2</sub>O<sub>4</sub> and BaAl<sub>2</sub>O<sub>4</sub>. As a result of our experimental studies, the existence of ternary compounds Вa<sub>3</sub>CaAl<sub>2</sub>O<sub>7</sub> and ВaCa<sub>2</sub>Al<sub>8</sub>O<sub>15</sub> was confirmed, and it was found that the Вa<sub>3</sub>CaAl<sub>2</sub>O<sub>7</sub> compound exists in the system at least up to a temperature of 1400 °C. Thus, our studies have determined an increase in the temperature limits of its existence, in contrast to the data of previous researchers, who indicated 1250 °C as the upper temperature of existence of Вa<sub>3</sub>CaAl<sub>2</sub>O<sub>7</sub>. </div> <div> <a data-readmore="{ block: '#abstractTextBlock599635', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 129 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/EI.7.29">Evaluation of Engineering Properties of Fired Cement Lateritic Brick</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> <i class="inline-icon lock-open-red inline-icon-small" title="Open Access"></i> Authors: Rasheed Abdulwahab, Glory O. Akinwamide, Mukaila Abiola Anifowose, Samson Olalekan Odeyemi </div> </div> <div id="abstractTextBlock603146" class="volume-info volume-info-text volume-info-description"> Abstract: The construction industry is really concerned with producing better and durable building materials. Hence, the high cost of conventional building materials have resulted into use of locally available materials. This study assess the effect of varying cement content on engineering properties of fired lateritic bricks. The lateritic soil samples were stabilized with cement at 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7 and 7.5%, cast in moulds and later fired for 8 hours at a 1000°C. Index properties (natural moisture content, specific gravity, particle size distribution and atterberg limit tests) were determined on the natural lateritic soil. While compressive strength, water absorption, abrasion and impact value test were determined on the cement fired bricks. The lateritic soil in its natural form were classified as A-6 and clay of high compressibility in accordance to ASTM D-3282. The results of the index properties are within acceptable limits for lateritic soil. The effect of varying cement content on the mechanical properties showed that the compressive strength of the bricks increases from 4.0 N/mm<sup>2</sup> at control (un-stabilized brick) to 7.3 N/mm<sup>2</sup> at 5% soil stabilization with cement. However, significant reductions in value was witnessed in the water absorption, abrasion and impact value results between the un-stabilized brick (control) and 5% cement fired bricks. The study concluded that fired bricks stabilized with 5% cement was found to be the best and most suitable for load and non-load bearing walls. </div> <div> <a data-readmore="{ block: '#abstractTextBlock603146', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 29 </div> </div> <div class="block-bottom-pagination"> <div class="pager-info"> Showing 1 to 10 of 451 Paper Titles </div> <div class="pagination-container"><ul class="pagination"><li class="active"><span>1</span></li><li><a href="/paper-keyword/cement/2">2</a></li><li><a href="/paper-keyword/cement/3">3</a></li><li><a href="/paper-keyword/cement/4">4</a></li><li><a href="/paper-keyword/cement/5">5</a></li><li class="PagedList-ellipses"><a class="PagedList-skipToNext" href="/paper-keyword/cement/6" rel="next">…</a></li><li class="PagedList-skipToNext"><a href="/paper-keyword/cement/2" rel="next">></a></li><li class="PagedList-skipToLast"><a href="/paper-keyword/cement/46">>></a></li></ul></div> </div> </div> </div> </div> </div> </div> <div class="social-icon-popup"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-popup-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-popup-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-popup-icon social-icon"></i></a> </div> </div> <div class="sc-footer"> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="footer-menu col-md-12 col-sm-12 col-xs-12"> <ul class="list-inline menu-font"> <li><a href="/ForLibraries">For Libraries</a></li> <li><a href="/ForPublication/Paper">For Publication</a></li> <li><a href="/insights" target="_blank">Insights</a></li> <li><a href="/DocuCenter">Downloads</a></li> <li><a href="/Home/AboutUs">About Us</a></li> <li><a href="/PolicyAndEthics/PublishingPolicies">Policy & Ethics</a></li> <li><a href="/Home/Contacts">Contact Us</a></li> <li><a href="/Home/Imprint">Imprint</a></li> <li><a href="/Home/PrivacyPolicy">Privacy Policy</a></li> <li><a href="/Home/Sitemap">Sitemap</a></li> <li><a href="/Conferences">All Conferences</a></li> <li><a href="/special-issues">All Special Issues</a></li> <li><a href="/news/all">All News</a></li> <li><a href="/read-and-publish-agreements">Read & Publish Agreements</a></li> </ul> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-footer-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-footer-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-footer-icon social-icon"></i></a> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12 footer-copyright"> <p> © 2024 Trans Tech Publications Ltd. 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