000185694 001__ 185694
000185694 005__ 20181203023052.0
000185694 0247_ $$2doi$$a10.1016/j.cemconres.2012.09.006
000185694 022__ $$a0008-8846
000185694 02470 $$2ISI$$a000313154700003
000185694 037__ $$aARTICLE
000185694 245__ $$aCement substitution by a combination of metakaolin and limestone
000185694 260__ $$aOxford$$bPergamon-Elsevier Science Ltd$$c2012
000185694 269__ $$a2012
000185694 300__ $$a11
000185694 336__ $$aJournal Articles
000185694 520__ $$aThis study investigates the coupled substitution of metakaolin and limestone in Portland cement (PC). The mechanical properties were studied in mortars and the microstructural development in pastes by X-ray diffraction, thermogravimetry analysis, mercury intrusion porosimetry and isothermal calorimetry. We show that 45% of substitution by 30% of metakaolin and 15% of limestone gives better mechanical properties at 7 and 28 days than the 100% PC reference. Our results show that calcium carbonate reacts with alumina from the metakaolin, forming supplementary AFm phases and stabilizing ettringite. Using simple mass balance calculations derived from thermogravimetry results, we also present the thermodynamic simulation for the system, which agrees fairly well with the experimental observations. It is shown that gypsum addition should be carefully balanced when using calcined clays because it considerably influences the early age strength by controlling the very rapid reaction of aluminates. (C) 2012 Elsevier Ltd. All rights reserved.
000185694 6531_ $$aCaCO3
000185694 6531_ $$aMetakaolin
000185694 6531_ $$aBlended cement
000185694 6531_ $$aHydration
000185694 700__ $$0244351$$aAntoni, M.$$g137423$$uEcole Polytech Fed Lausanne, STI, IMX, Lab Mat Construct, CH-1015 Lausanne, Switzerland
000185694 700__ $$aRossen, J.$$uEcole Polytech Fed Lausanne, STI, IMX, Lab Mat Construct, CH-1015 Lausanne, Switzerland
000185694 700__ $$aMartirena, F.
000185694 700__ $$0244030$$aScrivener, K.$$g138857$$uEcole Polytech Fed Lausanne, STI, IMX, Lab Mat Construct, CH-1015 Lausanne, Switzerland
000185694 773__ $$j42$$k12$$q1579-1589$$tCement And Concrete Research
000185694 909C0 $$0252300$$pLMC$$xU10341
000185694 909CO $$ooai:infoscience.tind.io:185694$$pSTI$$particle
000185694 917Z8 $$x184559
000185694 937__ $$aEPFL-ARTICLE-185694
000185694 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000185694 980__ $$aARTICLE