活性MgO碳化固化疏浚底泥的影响因素及作用机理  

Influencing Factors and Mechanism of Dredged Sediment Carbonated and Solidified with Reactive MgO

作　　者：孔祥辉 梁允鹏 崔帅 王潇康 张思峰 KONG Xianghui;LIANG Yunpeng;CUI Shuai;WANG Xiaokang;ZHANG Sifeng(School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Yifangda Construction Management Group Co.,Ltd.,Jinan 250014,China)

机构地区：[1]山东建筑大学交通工程学院,山东济南250101 [2]山东易方达建设管理集团有限公司,山东济南250014

出　　处：《建筑材料学报》2024年第7期620-628,共9页Journal of Building Materials

基　　金：山东省重点研发计划项目(重大科技创新工程)(2020CXGC011404)。

摘　　要：采用MgO碳化技术对疏浚底泥进行固化处理,通过强度试验和微观特性试验,系统分析了活性MgO碳化固化底泥的主要影响因素及微观机理.结果表明:增加活性MgO掺量能生成较多的水化产物和碳化产物,使得底泥强度明显增大;土体含水率与压实度能够影响CO_(2)在土体内部的运移,二者增大导致CO_(2)吸附量减少,从而影响底泥的碳化固化效果;长时间的碳化作用导致部分碳化产物发生变质反应,底泥强度随碳化时间的延长呈先增后减趋势;水化产物和碳化产物对土颗粒的包裹、胶结和孔隙填充是活性MgO碳化固化底泥的主要作用机理.MgO carbonization technology was used to solidify the dredged sediment.The main influencing factors and micro-mechanism of reactive MgO carbonization solidification of sediment were systematically analyzed through strength tests and microscopic characteristic tests.The results indicate that more hydration products and carbonization products can be generated with the increase of reactive MgO content,and the strength of sediment increases significantly.The water content and compaction degree are two main factors that affect the transport of CO_(2) in soil,and the increase of both will lead to the decrease of CO_(2) absorption,thus affecting the carbonization and solidification effect of sediment.The long-term carbonization can cause some carbonization products to undergo metamorphic reaction,so the strength of sediment increases first and then decreases with the increase of carbonization time.The encapsulation,cementation and pore filling of soil particles by hydration products and carbonization products are the main mechanism of reactive MgO carbonization solidification of sediment.

关 键 词：疏浚底泥 活性MgO 碳化 影响因素 微观机理 

分 类 号：U416.1[交通运输工程—道路与铁道工程]