摘要
针对冻融造成的混凝土路面剥蚀问题,采用聚丙烯纤维与聚合物胶粉和硅粉复合对混凝土进行改性,应用正交试验方案研究了胶粉掺量、硅粉掺量、纤维掺量以及纤维长度四个参数对聚丙烯纤维复合胶粉改性混凝土的抗冻性能的影响。结果表明,纤维掺量0.3%,纤维长度6mm,胶粉含量10%,硅粉掺量2.5%的聚丙烯纤维复合胶粉改性混凝土的抗冻性能最优;胶粉在水泥水化同时形成乳胶薄膜和引入气体能大幅度的提高混凝土的抗冻性;硅粉能有效的改善混凝土内部的孔结构,提高抗冻性;聚丙烯纤维配合胶粉能减轻胶粉在混凝土出现微裂缝时所受的拉应力,从而有效延长混凝土的抵抗冻融破坏的时间。
For the matter of the concrete pavement denudation caused by freezing-thawing, a method is adopted to modify the concrete by compounding the polypropylene fiber, polymer latex powder and silica powder. The influences of the four parameters of the content of latex powder, the silica powder and fiber and the length of fiber on the freeing resis-tance of polypropylene fiber composite powder modified concrete are studied by orthogonal experiments. The results show that the freezing resistance of polypropylene fiber composite latex powder modified concrete is optimal when the contents of fiber, latex powder and silica powder are respectively 0.3%, 10% and 2.5% and fiber length is 6 mm. Latex powder can significantly improve the freezing resistance of concrete by forming the latex thin film and introducing gas while the ce-ment hydrates. Silica fume can enhance the freezing resistance of concrete by improving the pore structure of internal concrete. Polypropylene fiber with latex powder can alleviate the tensile stress of latex powder when the micro-cracks oc-cur in concrete so that it can effectively prolong the time of resistance of freezing-thawing damage.
出处
《混凝土与水泥制品》
北大核心
2014年第11期49-51,共3页
China Concrete and Cement Products
基金
国家自然科学基金资助项目(51168041)
教育部"长江学者和创新团队发展计划"创新团队资助项目(IRT1067)
关键词
抗冻性
胶粉
聚丙烯纤维
正交试验
动弹模量衰减率
Freezing resistance
Latex powder
Polypropylene fiber
Orthogonal experiment
Attenuation rate of dy-namic elastic modulus
