Comparative performance of alkali activated slag/metakaolin cement pastes exposed to high temperatures

2017 ◽  
Vol 84 ◽  
pp. 157-166 ◽  
Author(s):  
Oswaldo Burciaga-Díaz ◽  
José Iván Escalante-García
Keyword(s):  
High Temperatures ◽  
Comparative Performance ◽  
Cement Pastes ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

Shrinkage Behavior of Alkali-Activated Slag Cement Pastes

2018 ◽  
Vol 761 ◽  
pp. 45-48 ◽  
Author(s):  
Vladyslav Omelchuk ◽  
Guang Ye ◽  
Rayisa Runova ◽  
Igor I. Rudenko
Keyword(s):  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
Chemical Shrinkage ◽  
Slag Cement ◽  
Cement Pastes ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Mineral Additives ◽  
Alkali Activated ◽  
Shrinkage Behavior

Nowadays, alkali-activated cements (AACs) are the most promising alternatives to ordinary portland cement (OPC). Such cements characterized by better strength and corrosion resistance that determine improved durability of materials based on them. However, the shrinkage of AAC systems is noticeably higher compared with OPC. The purpose of this work was to study the shrinkage behavior of alkali-activated slag cement (AASC) pastes. To improve early age performance of AASCs – OPC and Ca(OH)2, as mineral additives, were added to the designed cement mixtures. The properties, like, flexural and compressive strength of cement mortars, chemical shrinkage, autogenous shrinkage and drying shrinkage of cement pastes were studied. The results showed that the chemical shrinkage, autogenous shrinkage and drying shrinkage at 28 days were between 0.064 – 0.074 ml/g, 4.5 – 7.9 mm/m and 3.3 – 4.9 mm/m, respectively. The relationship between the nature of alkaline components, the type of mineral additives and the shrinkage behavior of cements were discussed.

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