硬化促进剂对水泥基泡沫混凝土性能影响

Influence of hardening accelerator on the performance of cement-based foam concrete

为分析硬化促进剂对水泥基泡沫混凝土性能的影响,对加入不同硬化促进剂的水泥基泡沫混凝土进行试验。以水泥质量为基准,分别添加2.0%的氯化钙和0.5%的草酸钙作为硬化促进剂,降低混凝土混合物的收缩变形,增加硬化泡沫混凝土的抗压强度。结果表明,集料稳定性显著提升,泡沫混凝土混合物的塑性收缩降低了47%~65%。在含有硬化促进剂的泡沫混凝土中,28 d龄期D400的抗压强度从0.31 MPa增至0.47 MPa, D600的抗压强度从0.96 MPa增至1.44 MPa,同时密度保持为D400和D600的平均密度。添加硬化促进剂可以有效提升水泥基泡沫混凝土的性能,满足实际工程的要求。

In order to analyze the effects of hardening accelerators on the performance of cement-based foam concrete,the experimental research on cement-based foam concrete with different hardening accelerators was carried out.Based on the mass of cement,2%calcium chloride and 0.5%calcium oxalate were added as hardening accelerator,respectively.In order to decrease the shrinkage of concrete mixture,and to increase the compressive strength of hardened foam concrete.The results show that the stability of the aggregate is significantly improved,and the plastic shrinkage of foamed concrete decreases by 47%~65%.The compressive strength of foamed concrete containing hardening accelerator increases from 0.31 MPa to 0.47 MPa and from 0.96 MPa to 1.44 MPa at 28 days of age,while maintaining the average density of D400 and D600.Hardening accelerator can effectively improve the performance of cement-based foam concrete to meet the requirements of practical engineering.