126
DOI:10.7672/sgjs2016230126
施工技术
CONSTRUCTION TECHNOLOGY
早强抗冲击混凝土路用性能研究
欧阳伟
（辽宁省交通高等专科学校道路与桥梁工程系，辽宁沈阳110122）
2016年12月上第45卷第23期
【摘要】采用复合水泥体系（普通硅酸盐水泥和硫铝酸盐水泥复合）作为早强抗冲击混凝土的胶凝材料，研究了聚内烯纤维和可再分散乳胶粉对早强抗冲击混凝土的力学性能、抗冲击性和耐磨性的影响，结果表明：体积掺量 1.0%的聚丙烯纤维对早强抗冲击混凝土的抗压和抗折强度影响不明显，体积掺量为2.0%时抗压和抗折强度降低，聚内烯纤维对早强抗冲击混凝土的压折比影响不明显，能够提高早强抗冲击混凝土的抗冲击性和耐磨性；可再分散乳胶粉能够降低早强抗冲击混凝土的抗压、抗折强度和压折比，提高早强抗冲击混凝土的抗冲击性和耐磨性；二者复合效果优于单掺效果，复掺对早强抗冲击混凝土起到双重改性效果。
【关键词］公路工程；混凝土；路面；聚丙烯纤维；可再分散乳胶粉；力学性能；抗冲击性；耐磨性
［中图分类号】U414
【文献标识码］A
[文章编号】1002-8498(2016)23-0126-04
PavementPerformanceofEarlyStrengthImpactResistanceConcrete
Ouyang Wei
( Department of Road and Bridge Engineering, Liaoning Prouincial College of Communication,
Shenyang,Liaoning 110122, China)
Abstract:In this paper, the composite cement(ordinary portland cement and sulphoaluminate cement) was used as the cementitious material of early strength impact resistance concrete(ESIRC), the effects of polypropylene fiber and redispersion emulsoid powder on the mechanical properties, impact resistance and wear resistance of ESIRC were studied. The results showed that the effect of polypropylene fiber on compressive strength and flexural strength of ESIRC was not obvious in the volume fraction of 1% , when the volume content was 2% , the compressive strength and flexural strength of ESIRC decreased, the influence of polypropylene fiber on the ratio of compressive strength to flexural strength was not obvious and could improve the impact resistance and wear resistance of ESIRC ; The redispersion emulsoid powder could reduce the compressive strength, flexural strength and the ratio of compressive strength to flexural strength of ESIRC and could improve the impact resistance and wear resistance of ESIRC; The composite effect of the two was better than that of single mixing, compound admixtures had double modified effect for ESIRC.
Key words : road construction ; concrete; pavements; polypropylene fiber; redispersion emulsoid powder; mechanical properties; impact resistance; wear resistance
水泥混凝土路面一般铺筑完后需要养护14~
21d才能开放交通，这对交通繁忙的地区极其不利。遭受冲击荷载结构的反应完全不同于承受静力时结构的反应，这是因为在遭受冲击荷载作用时，一方面结构整体会产生振动，另一方面结构局部部分材料的力学性能也会对结构反应产生影响。水泥混凝土路面的破坏往往是由于长期经受往复冲击
*辽宁省教育厅优秀人才支持计划
【作者简介］欧阳伟，博士，教授，E-mail；976903543@qq-com【收稿日期]方劳数据
动荷载造成的，水泥混凝土材料的动荷载疲劳过程是在反复冲击荷载的作用下，混凝土内部发生裂缝诱发、扩展、恢复不断循环的过程，在每一循环过程中的损伤程度和持续时间主要取决于混凝土材料的结构特性，即原发裂缝的尺寸和数量及在反复冲击荷载作用下阻止裂缝扩展的能力。混凝土材料在水化过程中不可避免地会产生细微裂缝和孔隙，这就为冲击荷载作用下裂缝的扩展提供了必要条件。