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Performance development of styrene-butadiene copolymer-modified calcium sulfoaluminate cement mortar under different curing conditions
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作者 Ru WANG Yu-sheng FAN +2 位作者 Zhao-jia WANG Tian-yong HUANG Tao ZHANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2021年第12期1005-1026,共22页
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 36... 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 different temperatures and relative humidities.The results show that the mechanical properties of reference mortar(RM)of CSA cement,including its flexural,compressive,and tensile bond strength,showed a reduction after a certain time,but its water capillary absorption 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 enhanced 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.Scanning electron microscope(SEM)observations of the morphology of RM and SBMM at 360 d cured under different conditions accounted well for the changes in mechanical properties. 展开更多
关键词 Calcium sulfoaluminate(CSA)cement styrene-butadiene copolymer(SB)dispersion mortar Properties Curing temperature Relative humidity(RH)
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硫铝酸钙膨胀剂与氧化镁膨胀剂对丁苯乳液改性砂浆性能的影响 被引量:3
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作者 魏阔 刘斯凤 《硅酸盐通报》 CAS 北大核心 2022年第7期2244-2250,共7页
本文研究了温度为20℃,相对湿度为90%(RH90%)和60%(RH60%)时,硫铝酸钙膨胀剂(CSA)与氧化镁膨胀剂(MEA)对丁苯乳液改性砂浆的工作性能、力学性能与收缩性能的影响。结果表明,丁苯乳液改性砂浆的流动度随着2种膨胀剂掺量的增加均先增大后... 本文研究了温度为20℃,相对湿度为90%(RH90%)和60%(RH60%)时,硫铝酸钙膨胀剂(CSA)与氧化镁膨胀剂(MEA)对丁苯乳液改性砂浆的工作性能、力学性能与收缩性能的影响。结果表明,丁苯乳液改性砂浆的流动度随着2种膨胀剂掺量的增加均先增大后降低。在RH90%与RH60%下,CSA掺量分别为水泥质量的6%与10%时,砂浆的抗折与抗压强度最高。2种相对湿度下,CSA都可有效降低砂浆干燥收缩;RH90%下掺8%MEA可提升砂浆抗折与抗压强度,亦可有效补偿砂浆后期干燥收缩;RH60%下掺8%MEA会降低砂浆抗折与抗压强度,且无法有效补偿砂浆的干燥收缩。 展开更多
关键词 丁苯乳液改性砂浆 膨胀剂 力学性能 收缩性能 硫铝酸钙膨胀剂 氧化镁膨胀剂
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