硬化水泥浆体早期开裂敏感性试验研究

Experimental Study on Cracking Sensitivity of Hardened Cement-Based Paste at Early Age

摘要:

通过小圆环约束开裂试验方法评价了不同胶凝材料体系的体积稳定性能.研究结果表明:不同胶凝材料体系开裂敏感性差异较大,其中硅灰>矿渣>粉煤灰>二元和三元复合组分;减缩剂能降低混凝土开裂敏感性;减缩剂和膨胀剂复合使用能够显著改善混凝土体积稳定性能.

Abstract:

Volume stability of cementitious materials can be evaluated by small steel rings restraint,the results show that cracking sensitivity is quite different between different cementitious material systems.It is concluded that silica fume >slag>fly ash>two or three of them combined in cracking sensitivity.Shrinkage-reducing agent can decrease cracking sensitivity and promote effectively volume stability performance when used in combination with expansion agent.