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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2000526


Performance development of SB modified CSA cement mortar under different curing conditions prediction


Author(s):  Ru WANG, Yu-sheng FAN, Zhao-jia WANG, Tian-yong HUANG, Tao ZHANG

Affiliation(s):  Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education; more

Corresponding email(s):   ruwang@tongji.edu.cn

Key Words:  CSA cement, Styrene-butadiene copolymer dispersion, Mortar, Properties, Curing temperature, Relative humidity


Ru WANG, Yu-sheng FAN, Zhao-jia WANG, Tian-yong HUANG, Tao ZHANG. Performance development of SB modified CSA cement mortar under different curing conditions prediction[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2000526"
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J0 - Journal of Zhejiang University Science A
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Abstract: 
The purpose of this study was to investigate the change in the physical and mechanical properties of styrene-butadiene copolymer (SB) dispersion modified calcium sulfoaluminate (CSA) cement mortar as it aged from 28 to 360 d, and cured at differ-ent temperatures and relative humidities. The results show that the mechanical properties of reference CSA cement mortar (RM), including its flexural, compressive and tensile bond strength, showed a reduction after a certain time, but its water capillary absorp-tion was hardly affected by age. When SB dispersion was added, there was no reduction in mechanical strength. The amount of SB added did matter. Addition of 5% SB had a negative effect on most properties compared with RM, except for tensile bond strength. However, the properties of SB modified mortar (SBMM) were enhanced significantly as the amount of SB was increased from 5% to 20%. Temperature change had different effects on the properties of RM and SBMM. High temperature was beneficial to early flexural and compressive strength development of RM, but caused serious strength reduction at later stages. High temperature en-hanced the development of tensile bond strength of RM. Increasing temperature enhanced properties of SBMM, including flexural, compressive and tensile bond strength. Higher relative humidity improved all measured properties of all mortars. SEM observa-tions of the morphology of RM and SBMM at 360 d cured under different conditions accounted well for the changes in mechanical properties.

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