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Effect of temperature on the cracking risk of concretes containing ground granulated blast-furnace slag

Author(s): Fragkoulis Kanavaris, Marios Soutsos and Jian-Fei Chen
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 1
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 257-264
Total Pages: 8
Language : English

Abstract: The effects of temperature on the cracking risk of normal strength concretes containing ground granulated blast furnace slag (GGBS) have been investigated. Sealed ring specimens were cast and cured under isothermal curing temperatures of 20, 30, 40 and 50 °C. The cracking tendencies of concretes with five replacement levels of Portland cement with GGBS, i.e. 0, 20, 35, 50 and 70% were investigated. It was found that the cracking risk of the investigated concretes was significantly affected by curing temperature, i.e. the risk of cracking was increased with an increase in curing temperature. This appears to be due to the autogenous shrinkage being accelerated with higher curing temperature. The cracking age of all investigated specimens was reduced with an increase in curing temperature; GGBS concretes however cracked at later ages than neat Portland cement concrete. It appears that although higher curing temperatures result in higher autogenous shrinkage, GGBS concretes are capable of withstanding the restraint stresses generated from autogenous shrinkage because of increased tensile strength resulting also from the higher curing temperatures.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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