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采用安明喆等人提出的测试方法对以纳米二氧化硅和硅灰为代表的超细活性二氧化硅对混凝土自生收缩的影响进行深入研究。实验结果表明:掺入纳米二氧化硅会提高混凝土的自生收缩应变,在初凝至1天龄期之间尤为明显;水胶比越低,混凝土的自生收缩越大;引气剂能够明显降低混凝土在各个龄期时的自生收缩应变。
Adopting the test method proposed by Anming Zhe et al., The influence of ultrafine active silica represented by nanosilica and silica fume on the autogenous shrinkage of concrete is deeply studied. The experimental results show that the incorporation of nanosilica increases the autogenous shrinkage strain of concrete, especially between the initial setting and the first day. The lower the ratio of water to binder, the greater the autogenous shrinkage of concrete and the lower the air entraining agent Self-generated concrete shrinkage strain at various ages.