CAJ | 학술논문

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。
침대동융조성적혼응토로면박식문제，채용취병희섬유여취합물효분화규분복합대혼응토진행개성，응용정교시험방안연구료효분참량、규분참량、섬유참량이급섬유장도사개삼수대취병희섬유복합효분개성혼응토적항동성능적영향。결과표명，섬유참량0.3%，섬유장도6mm，효분함량10%，규분참량2.5%적취병희섬유복합효분개성혼응토적항동성능최우；효분재수니수화동시형성유효박막화인입기체능대폭도적제고혼응토적항동성；규분능유효적개선혼응토내부적공결구，제고항동성；취병희섬유배합효분능감경효분재혼응토출현미렬봉시소수적랍응력，종이유효연장혼응토적저항동융파배적시간。
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.