在干湿循环下CaFe-LDHs掺合料对混凝土试块的抗硫酸盐侵蚀研究  

Study on sulfate resistance of CaFe-LDHS admixtures to concrete test blocks under dry and wet cycle

作　　者：马元洁 乔聪 谭维佳[2] MA Yuanjie;QIAO Cong;TAN Weijia(Department of Civil Archiecture,Shangqiu University,Kaifeng 475000,China;School of Geological Engineering and Mapping,Chang'an University,Xi'an 710054,China)

机构地区：[1]商丘学院土木建筑系,河南开封475000 [2]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《混凝土》2024年第1期84-88,94,共6页Concrete

基　　金：国家自然科学基金(41790443);长安大学中央高校基本科研业务费专项资金(300102260105)。

摘　　要：通过化学共沉淀法制备出Ca Fe-LDHs,并用于硫酸盐的吸附及混凝土试块的抗硫酸盐侵蚀研究。吸附试验表明,CaFe-LDHs对硫酸的吸附过程符合拟一级动力学模型和Langmuir模型,这说明CaFe-LDHs对硫酸盐具有更好的吸附性能。在抗硫酸盐侵蚀试验表明,混凝土试件的抗压强度随Ca Fe-LDHs掺量的增加而增加,且随着干湿循环的次数增加而先增加后减少。硫酸盐深度分布曲线表明,随着掺合料的增加能够有效地延缓硫酸盐对混凝土试块的侵蚀,并说明CaFe-LDHs作为掺合料能够有效地降低硫酸盐对混凝土试块的侵蚀。CaFe-LDHs was prepared by chemical co-precipitation,and CaFe-LDHs was employed for sulphate adsorption and anti-sul-phate erosion research on concrete specimen blocks.The adsorption experiments showed that the adsorption process of sulphate by CaFe-LDHs was in accordance with the pseudo-first-order kinetic model and Langmuir model,which suggested that CaFe-LDHs exhibited better adsorption properties for sulphate.In the sulphate erosion resistance experiments showed that the compressive strength of concrete specimens increased with the increasing dosage of CaFe-LDHs.Whereas,the compressive strength of concrete specimens increased and then decreased with the number of drying-wetting cycles.The sulphate depth distribution curve showed that with the increase of admixture could effectively retard the sulfate erosion on concrete specimens,and indicated that CaFe-LDHs as an admixture could significantly re-duce the sulfate erosion on concrete specimens.

关 键 词：CaFe-LDHs 硫酸盐 吸附 砂浆试块 抗硫酸盐侵蚀 

分 类 号：TU528.01[建筑科学—建筑技术科学]