建筑垃圾改良膨胀土特性试验研究  

Experimental Study on Characteristics of Modified Expansive Soil in Construction Waste

作　　者：杜思勇 张留俊[2,3] 周志清 孙亚康 DU Siyong;ZHANG Liujun;ZHOU Zhiqing;SUN Yakang(0x09CCCC First Highway Engineering Group Co.,Ltd.,Beijing 100024,China;CCCC First Highway Consultants Co.,Ltd.,Xi'an 710075,China;School of Highway,Chang'an University,Xi'an 710064,China)

机构地区：[1]中交一公局集团有限公司,北京100024 [2]中交第一公路勘察设计研究院有限公司,西安710075 [3]长安大学公路学院,西安710064

出　　处：《路基工程》2020年第3期94-99,113,共7页Subgrade Engineering

摘　　要：通过不同掺比、不同级配组合的建筑垃圾掺入到膨胀土后进行室内试验,分析试样的无侧限抗压强度、CBR力学特性和膨胀特性规律。结合建筑垃圾改良膨胀土作用机理,对工程特性进行分析。研究结果表明:一定比例掺量的建筑垃圾可以显著改善膨胀土的物理力学、膨胀性能;建筑垃圾改良膨胀土的力学特性、胀缩性取决于建筑垃圾的掺比和土的初始含水率大小,此外级配对其也有一定影响。当建筑垃圾掺比为40.0%左右,混合土含水率为12.4%左右、采用19.5~31.5 mm粒级再生料时,建筑垃圾改良膨胀土具有更好的工程特性,满足路基填料的要求。The laboratory test was carried out by mixing the mixed waste with different dosages and different grades into the expansive soil.The unconfined compressive strength,CBR mechanical properties and expansion characteristics of the samples were analyzed.Combined with the mechanism of construction waste to improve expansive soil,the engineering characteristics were analyzed.The results show that:a certain proportion of construction waste can significantly improve the physical mechanics and expansion performance of expansive soil;the mechanical properties and expansion and contraction of modified expansive soil of construction waste depend on the amount of construction waste and the initial moisture content of soil.In addition,grading has a certain impact on it.When the amount of construction waste is about 40.0%,the moisture content of mixed soil is about 12.4%,and the 19.5~31.5 mm granular grade recycled material is used,the construction waste modified expansive soil has better engineering characteristics and meets the requirements of roadbed filling.

关 键 词：建筑垃圾 改良弱膨胀土 比例 级配 力学性能 胀缩性 

分 类 号：U416.167[交通运输工程—道路与铁道工程]