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减缩抗裂型混凝土超塑化剂的性能及其作用机理
作者:冉千平 刘加平 缪昌文 吴石山 沈健  
单位:南京大学化学化工学院 江苏省建筑科学研究院有限公司 江苏省建筑科学研究院有限公司 南京大学化学化工学院 南京大学化学化工学院 南京210093 江苏省建筑科学研究院有限公司 南京210008 南京210008 南京210008 南京210093 南京210093 
关键词:多功能型超塑化剂  干燥收缩  自收缩  开裂性能  作用机理 
分类号:TU528.042
出版年,卷(期):页码:2006,34(12):1537-1541
DOI:
摘要:
开发了一种新型的减缩抗裂型超塑化剂(shrinkage-reducingandanti-crackingpolycarboxylate-basedsuperplasticizer,SRPCA),掺量为水泥质量的0.2%时,减水率可达22.3%,且增强效果明显。和掺传统萘系减水剂的混凝土相比,掺SRPCA的混凝土90d的自收缩率和干燥收缩率分别降低了52.1%和44.9%。平板和圆环开裂实验证实:SRPCA大大提高了混凝土的抗裂能力。SRPCA的减缩抗裂效果基本接近减缩剂掺量为胶凝材料总质量2%的减缩抗裂效果,但SRPCA的掺量不到复掺萘系减水剂和减缩剂的1/10。
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A new shrinkage-reducing and anti-cracking polycarboxylate-based superplasticizer(SRPCA) was developed.The water reduction of SRPCA can reach up to 22.3% at a rate of 0.20% by mass of cement.Moreover,the strength characteristics of the SRPCA are improved obviously.Compared with the conventional superplasticizer(FDN),the SRPCA demonstrates 52.1% less auto-genous shrinkage and 44.9% less drying shrinkage of concrete.In addition,slab and restrained ring tests proved that the SRPCA can improve the crack properties of concrete greatly.The decreasing of surface tension in the water of pores which leads to lower capillary stress is thought to be the main action mechanism by which the SRPCA reduces shrinkage.
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参考文献:
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