纤维对混凝土早期热膨胀系数的影响

Effect of Fibers on Early-age Thermal Dilation Coefficient of Cement Concrete

在混凝土中分别掺加相同质量的碳纤维和聚酯纤维，采用平板加热器对不同类型的混凝土试件循环加热，测试了其浇筑后5—29d的温度变形情况，计算了其热膨胀系数。龄期达到29d，聚酯纤维混凝土热膨胀系数下降约8％，碳纤维混凝土热膨胀系数下降约20％。结果表明，纤维的掺入能有效降低混凝土的早期热膨胀系数；纤维质量相同时，弹性模量高的碳纤维较弹性模量低的聚酯纤维能更显著地降低混凝土的早期热膨胀系数。

The same mass of carbon fiber and polyester fiber areadded to plain concrete, respectively. A panel heater is used for recirculating heating different types of concrete specimens. The temperature deformation of specimens is measured from the 5th day to 29th day after pouring the concrete, and their thermal dilation coefficients （TDC） are calculated accordingly. On the 29th day, the TDC of polyester fiber concrete and carbon fiber concrete are reduced by 8% and 20%, respectively. The results show that fiber can effectively reduce the thermal dilation coefficient of concrete. Under the condition of the same mass of doping, carbon fiber with high elastic modulus can lower thermal dilation coefficient of concrete better than polyester fiber with low elastic modulus.