无机土壤固化剂对生土材料的改性及其机理  

Effect of Inorganic Soil Stabilizer on Properties of Raw Soil Material

作　　者：胡明玉[1] 付超[1] 魏丽丽[1] 郑江[1] 

机构地区：[1]南昌大学建筑工程学院,南昌330031

出　　处：《材料研究学报》2017年第6期445-450,共6页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51362021);江西省水利厅科技项目(KT201331)~~

摘　　要：研究了无机土壤固化剂对生土材料强度、耐水性和抗冻性能的影响,和无机土壤固化剂提高生土材料强度、耐水性和抗冻性的机理。结果表明,无机土壤固化剂掺量为20%~25%时60 d抗压强度、软化系数和抗冻性指标(BDR)分别达到8.78 MPa、0.85和38.38%,具有较高的强度、耐水性和抗冻性。无机土壤固化剂与生土中的SiO_2和Al_2O_3反应生成Ca·1.7MgO·3SiO_4、2CaO·Al_2O_3·SiO_2和Na_2CaSiO_4等新产物,再加上无机土壤固化剂中α-C_2S和γ-C_2S水化生成C-S-H凝胶,是使生土材料产生强度、耐水性和抗冻性的主要原因。The effect of inorganic soil stabilizer, as soil modifier, on the compression strength, water resistance, freeze-thaw resistance of the raw soil materials was assessed,whilst the prepared materials were characterized by means of scanning electron microscope and X-ray diffractometer. The results show that the compressive strength, softening coefficient and freeze-thaw resistance（BDR） are 8.78 MPa, 0.85 and 38.38% respectively for the raw soil material with addition of 20%~25% inorganic soil stabilizer after maintenance for 60 days, which indicates that the material has an excellent performance. The inorganic soil stabilizer reacts with SiO_2 and Al_2O_3 in the soil to generate new products such as Ca·1.7Mg O·3SiO_4,2CaO·Al_2O_3·SiO_2 and Na_2CaSiO_4, in the meanwhile, α-C_2S and γ-C_2S within the modified admixture may react with water to produce C-S-H gel, which are the main causes responsible to the enhancement of the performance of the raw soil material.

关 键 词：无机非金属材料 生土材料 无机土壤固化剂 抗压强度 软化系数 抗冻性 

分 类 号：TU521[建筑科学—建筑技术科学]