矿渣、粉煤灰掺量对混凝土收缩、开裂性能的研究

Research on the Concrete Shrinkage and Cracking Properities with Different Slag or Fly-ash Proportion

收缩开裂是影响现代混凝土耐久性的主要因素,通过圆环开裂试验、收缩试验来评定矿物掺和料对混凝土收缩开裂的影响,结果表明矿渣掺量在一定范围内时可抑制混凝土的开裂,混凝土的自收缩随矿渣掺量的增大而增大,干缩随矿渣掺量的增大而减小。粉煤灰可有效抑制混凝土的开裂,随掺量的增大抑制作用越显著。粉煤灰掺量越大对自收缩的抑制作用越明显,混凝土的干缩略有增大。

Shrinkage and cracking were the primary factors influencing the durability of modern concrete. The effects of mineral admixtures on the concrete shrinkage and cracking properities were tested by the ring test method and shrinkage experiment. The experimental results show that slag could inhibit the cracking of concrete within the range of certain proportion. With the the increase of slag proportion the self-shrinking of concrete increased, but the drying shrinkage of concrete discreased. Fly-ash could effectively inhibit the cracking of concrete , with the increase of fly-ash proportion the concrete cracking could be effectively inhibited. With the increase of fly-ash proportion the self-shrinking of concrete discreased, but the drying shrinkage of concrete would increased.