耐撞磨性是影响再生骨料透水混凝土使用寿命及适用性的关键因素,目前国内外尚缺乏系统的研究。通过试验研究了不同水胶比、短切玄武岩纤维、粉煤灰、再生骨料替代率、双粒级骨料(5~10 mm,10~20 mm)掺量等因素对再生骨料透水混凝土耐撞磨性的影响。结果表明:水胶比超过0.27时,再生骨料透水混凝土撞磨时质量损失随水胶比增大而增大;内掺10%粉煤灰能够提高再生骨料透水混凝土耐撞磨性;再生骨料透水混凝土的耐撞磨性随着替代率的增加先增大后减小,替代率为50%时耐撞磨性最好;双粒级有利于提高再生骨料透水混凝土耐撞磨性能。此外,强度、密度及孔隙率是影响再生骨料透水混凝土耐撞磨性的主要因素,总体呈现强度越大、密度越大或是孔隙率越小,耐撞磨性越好的趋势。
Abstract
Impact-abrasion resistance is the key factor that affects the service life and applicability of recycled aggregate pervious concrete. At present, systematic research is lacking in China and abroad. The influences of water-cement ratio, chopped basalt fiber, fly ash, replacement rate of recycled aggregates, and amount of double-grained aggregate (5-10 mm, 10-20 mm) on the wear resistance of recycled aggregate pervious concrete were examined in this research. Test results indicate that when water-cement ratio exceeds 0.27, the mass loss from the recycled aggregate pervious concrete increases as the water-cement ratio rises, which means that the impact-abrasion resistance is ideal at a water-cement ratio of 0.27. The incorporation of 10% fly ash could improve the impact-abrasion resistance of recycled aggregate pervious concrete. As the replacement rate rises, the impact-abrasion resistance ameliorates at first and then reduces; the impact-abrasion resistance is optimal at the replacement rate of 50%. The double-grained grade is conducive to the improvement of impact-abrasion resistance of recycled aggregate pervious concrete. In addition, strength, density, and porosity are the main factors affecting the impact-abrasion resistance of recycled aggregate pervious concrete. In general, the greater the strength and density or the lower the porosity, the better the impact-abrasion resistance tends to be.
关键词
再生骨料透水混凝土 /
耐撞磨性 /
质量损失 /
影响因素 /
统计规律
Key words
recycled aggregate pervious concrete /
impact-abrasion resistance /
mass loss /
influencing factors /
statistical rule
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基金
国家自然科学青年基金项目(51309101);国家自然科学基金面上项目(51679092);河南省重大科技攻关项目(172102210372);河南省产学研合作项目(182107000031)
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