铁水脱硫渣混合土基层材料干缩特性研究  

Study on drying shrinkage performance for hot metal desulphurization slag solidified soil base material

作　　者：时光龙 张众华 张丽[1] 唐刚[1] 张浩[1] 黄伟[1] SHI Guanglong;ZHANG Zhonghua;ZHANG Li;TANG Gang;ZHANG Hao;HUANG Wei(School of Civil Engineering and Architecture,Anhui University of Technology,Ma’anshan Anhui 243002,China;Sinosteel Ma’anshan General Institute of Mining Research Co.,Ltd.,Ma’anshan Anhui 243002,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002 [2]中钢集团马鞍山矿山研究院有限公司,安徽马鞍山243002

出　　处：《化工矿物与加工》2024年第12期14-21,共8页Industrial Minerals & Processing

基　　金：安徽省高校自然科学研究重大项目(KJ2018ZD006);安徽省住房城乡建设科学技术计划项目(2018YF-007)。

摘　　要：干缩引起的开裂是半刚性基层产生裂缝的重要原因,利用铁水脱硫渣遇水膨胀的特点,以铁水脱硫渣和素土为主料,外掺矿渣微粉、硅灰等材料制备铁水脱硫渣混合土(SSMS)半刚性基层材料,控制并利用其体积膨胀以补偿干缩,开展体积膨胀率、失水率、干缩应变、干缩系数的试验研究。结果表明:SSMS中主料铁水脱硫渣占比越大,其体积膨胀率越高,累计失水率、干缩应变和干缩系数越小,其掺量从30%增至70%,体积膨胀率升高了173.88%,干缩系数降低了89.88%;铁水脱硫渣不利于SSMS的体积安定性,但有利于其抗干缩性能;外掺料矿渣微粉、硅灰掺量增加,其体积膨胀率下降,累计失水率、干缩应变和干缩系数增大,矿粉和硅灰掺量分别从20%增至60%、3%增至5%,其体积膨胀率分别降低了67.68%和21.48%,矿渣微粉、硅灰均能有效抑制SSMS的体积安定性。Cracking caused by dry shrinkage was one of the important reasons for the formation of cracks in the semirigid base.The semi-rigid base material of hot metal desulphurization slag mixed soil(SSMS)was fabricated by hot metal desulphurization slag and using its characteristics of expansion in water,which was combined with raw soil as the main material,and the materials such as slag fine powder and silica fume were added to control and use its volume expansion to compensate for dry shrinkage.The volume expansion rate,water loss rate and dry shrinkage strain were studied.The results showed that the bulk expansion rate of molten iron desulphurization slag increased with the increase of the proportion of main material in the mixed soil,and the cumulative water loss rate,dry shrinkage strain and dry shrinkage coefficient decrease.The content increased from 30%to 70%,the volume expansion rate increased by 173.88%,and the dry shrinkage coefficient decreased by 89.88%,indicating that the desulphurization slag was not conducive to the volume stability of SSMS,but was beneficial to its dry shrinkage resistance.The volume expansion rate decreased,the accumulated water loss rate,dry shrinkage strain and dry shrinkage coefficient increased.Mineral fines increased from 20%to 60%and silica fume increased from 3%to 5%,respectively,and the volume expansion rates of SSMS decreased by 67.68%and 21.48%,respectively,indicating that the volume stability of SSMS could be effectively inhibited by the addition of slag fine powder and silica fume.

关 键 词：铁水脱硫渣 固化土 基层材料 安定性 体积膨胀率 干缩性能 

分 类 号：TU521[建筑科学—建筑技术科学]