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Le Chatelier's concrete conundrum.
Proc Natl Acad Sci U S A
January 2025
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
The shard test and nanoporomechanics reverse classical paradigm of cement hydration being contractive.
Proc Natl Acad Sci U S A
December 2024
Civil and Environmental Engineering Department, Northwestern University, Evanston, IL 60208.
Le Chatelier in 1887 and Powers in 1947 demonstrated that the volume of nanoscale C-S-H (calcium silicate hydrate) particles formed during hydration is smaller than the combined volume of the reactants-the anhydrous Portland cement and water. Hydration has thus been considered as contractive. An experiment shows that the opposite is true above the nanoscale.
View Article and Find Full Text PDFConcrete Shrinkage Analysis with Quicklime, Microfibers, and SRA Admixtures.
Materials (Basel)
March 2023
Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentu Str. 48, LT-51367 Kaunas, Lithuania.
This research explores the effect of various humidity conditions and the efficiency of shrinkage-reducing admixtures on the free shrinkage strain of ordinary Portland cement (OPC) concrete and its mechanical properties. An OPC concrete C30/37 mixture was replenished with 5% of quicklime and 2% of organic-compound-based liquid shrinkage-reducing agent (SRA). The investigation revealed that a combination of quicklime and SRA led to the highest reduction in concrete shrinkage strain.
View Article and Find Full Text PDFInfluence of Silica Fume on High-Calcium Fly Ash Expansion during Hydration.
Materials (Basel)
May 2022
Institute of Civil Engineering, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia.
The purpose of this work was to study the possibility of neutralizing high-calcium fly ash expansion during hydration. The object of the study was the fly ash of Berezovskaya GRES, which is capable of independent setting and hardening. The test in the Le Chatelier molds showed that the divergence of indicator arms was 90-100 mm 1 day after mixing with water.
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