管道压浆浆液外加剂类型及掺量影响研究  

The Influence of the Type and Content of Additives on Pipeline Grouting Slurry

作　　者：戎密仁 薛志坤 李向国 刘喜坤 李帅 RONG Miren;XUE Zhikun;LI Xiangguo;LIU Xikun;LI Shuai(School of Urban Geology and Engineering,Hebei GEO University,Shijiazhuang,Hebei 050031;Hebei Underground Artificial Environment Smart Development and Management Technology Innovation Center,Shijiazhuang,Hebei 050031;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043;Hebei Academy of BuildingResearch Co.,Ltd,Shijiazhuang,Hebei 050227)

机构地区：[1]河北地质大学城市地质与工程学院,河北石家庄050031 [2]河北省地下人工环境智慧开发与管控技术创新中心,河北石家庄050031 [3]石家庄铁道大学土木工程学院,河北石家庄050043 [4]河北省建筑科学研究院有限公司,河北石家庄050227

出　　处：《地质与勘探》2023年第2期398-407,共10页Geology and Exploration

基　　金：国家自然科学基金青年项目(编号:51908344);河北省建设科技研究指导性计划项目(编号:2022-2090)联合资助。

摘　　要：预应力管道压浆浆液外加剂种类及配合比的选取是管道压浆工艺的重要部分。为研究减水剂和矿物掺和料对管道压浆浆液的影响及作用机理,进而研制一种流动性、保水性及力学性能优异的管道压浆浆液,本研究采用单组分掺和试验的方法,对掺有减水剂与矿物掺合料两种不同压浆浆料进行流动性、压力泌水率、沉积密度比、抗压及抗折性能试验研究,并得到不同掺量外加剂对压浆浆液和易性与力学性能的影响和作用机理,以及合适的外加剂掺量配比。研究表明:聚羧酸减水剂30 min与60 min流动度最佳,且压力泌水率表现也较为良好,综合考虑聚羧酸减水剂为压浆浆液的优良减水剂;聚羧酸减水剂掺量在0.4%~0.5%时,浆液的流动性与保水性表现良好,随掺量的继续增加,流动性提升较小;微珠由于其物理性质以及化学性质,对提高压浆浆液和易性与力学性能的效果较为明显;微珠掺量在10%~15%时,压浆浆液的和易性达到临界状态。The selection of admixture type and proportion of prestressed pipeline grouting is important for the pipeline grouting technology.This work aims to determine the effect and action mechanism of superplasticizer and mineral admixtures on pipeline grouting,in an attempt to develop a pipeline grout with excellent fluidity,water retention and mechanical properties.The method of single component admixture tests was adopted to test the liquidity,pressure bleeding rate,deposition density ratio,compressive strength and flexural performance of two different grouting slurries mixed with superplasticizer and mineral admixtures.The effects and mechanism of different admixtures on workability and mechanical properties of grouting slurry were obtained,and the ratio of appropriate dosage of admixture was determined.Results show that the polycarboxylic superplasticizer has the best fluidity at 30 min and 60 min,with good performance of pressure bleeding rate.The polycarboxylic superplasticizer is an excellent superplasticizer for grouting slurry.When the dosage of polycarboxylic superplasticizer ranges between 0.4%and 0.5%,the fluidity and water retention of the slurry is good,and the fluidity increases slightly with the dosage of polycarboxylic superplasticizer.Cenosphere can well improve the workability and mechanical properties of the grouting slurry due to its physical and chemical properties.When the dosage of cenosphere is 10%to 15%,the workability of grouting slurry reaches a critical state.

关 键 词：压浆浆液 单组分掺和试验 外加剂 和易性 力学性能 

分 类 号：TU997[建筑科学—市政工程]