二次添加剂在粉煤灰基软路基土壤稳定中的应用  

Application of Secondary Additives in Soil Stabilization of Fly Ash-based Soft Roadbed

作　　者：尹威 YIN Wei(CCCC THEC General Contracting Branch,Beijing 100123,China)

机构地区：[1]中交第三公路工程局有限公司总承包分公司,北京100123

出　　处：《价值工程》2021年第28期111-113,共3页Value Engineering

摘　　要：膨胀土分布广泛,由于低强度、高压缩性和大体积变化等性能,使其成为道路、建筑物、地基和其他基础设施损坏的潜在威胁。已有文献对利用粉煤灰稳定膨胀土进行了广泛的研究。本文描述了如何使用二次添加剂(酶和聚合物)进一步提高粉煤灰基稳定土的性能。对不同添加剂组合开展了一系列机械和微观测试(CBR、压实测试、XRD)。研究结果表明,二次添加剂可以有效地提高粉煤灰基土壤稳定的效率。粉煤灰-酶-聚合物被确定为提高固化土承载力的最佳组合,而粉煤灰-酶也显示出较好路基性能,这揭示了当使用二次添加剂处理粉煤灰稳定的弱土壤时,可带来减少路面厚度的实质性好处。Expansive soil is widely distributed.Due to its low strength,high compressibility and large volume changes,it becomes a potential threat to roads,buildings,foundations and other infrastructure damage.Existing literature has extensively studied the use of fly ash to stabilize expansive soil.This article describes how to use secondary additives(enzymes and polymers)to further improve the performance of fly ash-based stabilized soils.A series of mechanical and microscopic tests(CBR,compaction test,XRD)were carried out on different additive combinations.The research results show that the secondary additives can effectively improve the efficiency of fly ash-based soil stabilization.Fly ash-enzyme-polymer is determined to be the best combination to improve the bearing capacity of solidified soil,and fly ash-enzyme also shows better roadbed performance,which reveals the weak stability of fly ash when treated with secondary additives.In soil,it can bring substantial benefits of reducing the thickness of the road surface.

关 键 词：粉煤灰 膨胀土 稳定化 二次添加剂 路面性能 

分 类 号：U416.1[交通运输工程—道路与铁道工程]