Early age shrinkage and heat of hydration of cement-fly ash-slag ternary blends. (30th October 2017)

• Record Type: Journal Article
• Authors: Hu, Xiang; Shi, Caijun; Shi, Zhenguo; Tong, Baihui; Wang, Dehui
• Is Part Of: Construction & building materials. Volume 153(2017)
• Page Start: 857
• Page End: 865
• Publication Date: 2017-10-30
• Subjects: Autogenous shrinkage -- Hydration heat -- Mineral admixtures -- Chemical shrinkage; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.07.138
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Autogenous shrinkage of cement mortars after mixing is investigated. The total hydration heat of cement paste is more controlled by cement content. Air voids within samples are tested and being transformed to chemical shrinkage. The calculated chemical shrinkage shows good relation to hydration heat of samples. Abstract: This study investigated the early age autogenous and chemical shrinkage of mortars with slag and fly ash obtained by sieving the freshly mixed concrete after mixing. The hydration heat and contents of air voids formed within mortars during cement hydration were also tested using isothermal calorimetry and 1 H NMR. The results showed that the decrease of w/b ratio significantly increased the autogenous shrinkage of mortars, which was more significant for the mortars containing fly ash and slag. With the increase of slag and fly ash replacement level, the autogenous shrinkage of cement mortars decreased linearly. At the same w/b ratio the cumulative heat of hydration and autogenous shrinkage of cement pastes have a good linear correlation. The fraction of voids formed during hydration increased significantly with increasing w/b ratio. For samples with high w/b ratio (e.g. 0.4), the volume of air voids was higher than that of autogenous shrinkage, which was lower for sample with w/b ratio 0.3. The chemical shrinkage calculated from air voids and measured autogenous shrinkage can be well correlated to the hydration heat.