硫酸溶液环境下赤泥基地聚合物强度特性研究  

Study on Strength Characteristics of Red Mud Based Geopolymer in Sulfuric Acid Solution Environment

作　　者：刘剑平 谢国帅 宁全纪 张继霞 谢向前 曹园章 黄亚康 白晓红[3,4] Liu Jianping;Xie Guoshuai;Ning Quanji;Zhang Jixia;Xie Xiangqian;Cao Yuanzhang;Huang Yakang;Bai Xiaohong(Engineering Test Center,PowerChina Huadong Engineering Corporation Limited,Hangzhou,Zhejiang 310014;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,Zhejiang 310058;College of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024;Key Laboratory of Geotechnical and Underground Engineering of Shanxi Province,Taiyuan,Shanxi 030024)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州310014 [2]浙江大学建筑工程学院,浙江杭州310058 [3]太原理工大学土木工程学院,山西太原030024 [4]山西省岩土与地下工程重点实验室,山西太原030024

出　　处：《非金属矿》2023年第5期90-93,共4页Non-Metallic Mines

基　　金：国家自然科学基金项目(51879180,41807256);中国电建集团华东勘测设计研究院有限公司重大科技攻关项目(KY2023-SY-02-01,KY2019-SY-01)。

摘　　要：通过室内配制硫酸溶液模拟酸性环境中RM-CMK地聚合物的腐蚀试验,研究不同侵蚀龄期下RM-CMK地聚合物外观形貌、应力-应变曲线和抗压强度的变化规律。借助压汞(MIP)测试技术,表征硫酸溶液环境中不同侵蚀龄期RM-CMK地聚合物的孔隙特征。从微观的角度解释硫酸溶液环境中RM-CMK地聚合物宏观特性变化原因。结果表明,RM-CMK地聚合物具有良好的耐硫酸腐蚀性能,经过112 d硫酸溶液侵蚀后,抗压强度仍能达到未侵蚀之前50%以上,但是在28 d侵蚀龄期时,试块表面开始变得粗糙,在56 d侵蚀龄期时,试块开始出现裂纹,并随侵蚀龄期增加愈加明显;RM-CMK地聚合物在硫酸溶液环境中同时进行酸腐蚀反应和地质聚合反应,不同侵蚀龄期阶段两者的强弱不同;RM-CMK地聚合物在硫酸溶液环境中内部的孔隙体积和孔径分布未发生明显改变,无害孔逐渐向少害孔和多害孔转变。The corrosion test of RM-CMK geopolymer in the simulated acidic environment by preparing sulfuric acid solution in laboratory was carried out to study the appearance morphology,stress-strain curve and compressive strength of RM-CMK geopolymer at different erosion ages.The pore characteristics of RM-CMK geopolymer in sulfuric acid solution environment at different erosion ages were characterized by mercury intrusion porosimetry(MIP)testing technology.From a microscopic perspective,the reasons for the macro-characteristics change of RM-CMK geopolymer in sulfuric acid solution environment were explained.The results show that RM-CMK geopolymer has good sulfuric acid corrosion resistance.After 112 d sulfuric acid solution erosion,the compressive strength can still reach more than half of that before erosion.However,the surface of the block begins to become rough at the 28 d erosion age.Cracks begin to appear on the block at 56 d of erosion age,which becomes more obvious with the erosion age.RM-CMK geopolymer undergoes acid corrosion reaction and geological polymerization reaction in sulfuric acid solution environment at the same time.The strength and weakness of two reactions are different at different erosion age stages.The pore volume and pore size distribution of RM-CMK geopolymer does not change obviously in sulfuric acid solution environment,but harmless pores gradually change to less harmful pores and more harmful pores.

关 键 词：地聚合物 硫酸溶液 外观形貌 抗压强度 孔隙特征 

分 类 号：TQ316.3[化学工程—高聚物工业]