减缩抗裂型超塑化剂对免振捣自密实混凝土收缩性能的影响

通过试验,研究了不同外加剂对免振捣自密实混凝土收缩变形的影响。结果表明,掺入减缩抗裂型超塑化剂(JM-PCAⅣ)可以有效减少免振捣自密实混凝土的凝缩、早期收缩、干燥收缩及自收缩变形。

The influences of different type of chamical admixtures on contracted deformations of free-vibration and self-compacted concrete are studied by testing. The rezults show that, it is able to effectively reduce the contractional deformation, including the setting contracts, early age contracts, dry shrinbage and self-shrinkege, when the superplasticizer of JM-PCA（Ⅳ）, a type of reduced contraction and anti-cracking admixture, is added.