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文章研究了三种外掺料对路面混凝土早期开裂性能的影响。通过理论分析,将水泥路面的早期开裂机理归结为混凝土具有塑性收缩、自收缩和干缩等早期收缩性能;采用室内试验分别研究了聚丙烯纤维、钢纤维和粉煤灰对混凝土早期收缩性能的改善效果。研究结果表明,聚丙烯纤维和粉煤灰能够大幅度降低混凝土的早期收缩值,钢纤维的改性作用则不明显。最后建议为全面评价不同混凝土的长期开裂性能,应增加开裂后的疲劳和冲击试验研究。
The effects of three kinds of admixtures on the early cracking behavior of pavement concrete were studied. Through theoretical analysis, the early cracking mechanism of cement pavement is attributed to the early shrinkage of concrete with plastic shrinkage, self-shrinkage and shrinkage. The effects of polypropylene fiber, steel fiber and fly ash on the early shrinkage properties of concrete Improve the effect. The results show that polypropylene fiber and fly ash can significantly reduce the early shrinkage of concrete, steel fiber modification is not obvious. Finally, in order to comprehensively evaluate the long-term cracking performance of different concrete, fatigue test and impact test after cracking should be added.