水泥稳定炉渣碎石基层路用性能

Pavement Performance of Cement Stabilized Municipal Solid Waste Incineration Bottom Ash Aggregate and Crushed Stones

摘要:

为研究生活垃圾焚烧炉渣集料对水泥稳定碎石基层路用性能的影响规律，将0～9.5 mm炉渣集料按照不同比例替代天然石料制备了水泥稳定炉渣碎石混合料，并测试了混合料的击实特性和无侧限抗压强度、劈裂强度、抗压回弹模量、收缩特性及抗冻性.结果表明：炉渣集料掺量越高，混合料最佳含水率越大且最大干密度越小；水泥稳定炉渣碎石的抗压强度、劈裂强度、抗压回弹模量、抗冻性均低于水泥稳定碎石；炉渣集料增加了试件的长期干缩变形，但降低了试件对失水率的敏感性，炉渣集料掺量不超过30%将减小试件温缩变形及对温度的敏感性.综合考虑，炉渣集料替代水泥稳定碎石中天然石料的质量分数宜在20%～30%.

关键词:道路工程; 垃圾焚烧炉渣集料; 水泥稳定炉渣碎石; 性能; 掺量

Abstract:

In order to investigate the pavement performance of cement stabilized municipal solid waste incineration bottom ash aggregate (BAA) and crushed stones, natural aggregate were replaced by BAA (0 9.5 mm) with different percentages to prepare the mixture. Then the performance including compaction characteristic, unconfined compressive strength, splitting strength, compressive modulus of resilience, shrink characteristic and frost resistance was tested. The results show that BAA increases the optimum waster and decreases the maximum density of the mixture. The unconfined compressive strength, the splitting strength, the compressive modulus of resilience and the frost resistance of the mixture contained BAA are lower than those of the control mixture. The use of BAA increases the long term dry shrinkage strain of the specimens, while decreases the sensitivity to water loss. Moreover, when the dosage of BAA does not exceed 30% of the aggregates, both the temperature shrinkage strain of the specimens and the sensitivity to temperature can be decreased. Based on the performance analysis, it is recommended that the dosage of BAA is 20% to 30%.

Key words:road engineering; municipal solid waste incineration bottom ash aggregate; cement stabilized BAA and crushed stones; performance; dosage