HCSA 膨胀剂对自密实混凝土早期收缩的影响

摘要

Using the non-contact testing method of concrete shrinkage deformation, the effect of HCSA expansive a-gent on the early shrinkage of self compacting concrete is studied. The results show that with higher grade of strength, there is the tendency to increase early shrinkage of self compacting concrete. For the typical ordinary self compacting con-crete of strength grade C40, its 3d shrinkage rate is about 1350×10-6. When adding 8% HCSA expansive agent, the early shrinkage can be reduced by 80%~92%. With the full moisturizing maintenance conditions, the self compacting concrete mixed with HCSA expansive agent can be in a constant non-shrinkage state.%采用非接触混凝土收缩变形测试方法，研究了掺 HCSA 膨胀剂自密实混凝土的早期收缩性能。结果表明，随着强度等级的提高，自密实混凝土的早期收缩率有增大的趋势；对于典型的强度等级为 C40的普通自密实混凝土，3d 收缩率约为1350×10-6；当掺加8%的 HCSA 膨胀剂时，其早期收缩可减少80%~92%；在充分保湿养护的条件下，掺 HCSA 膨胀剂的自密实混凝土可处于零收缩状态。