新型珍珠岩保温砂浆力学性能及影响机理研究  

Reaching on the Mechanical Properties of New Pearlite Thermal Mortar and Its Function Mechanism

作　　者：王双超[1] 徐方[1] 阮景新 林秀根 李柠旭 

机构地区：[1]中国地质大学工程学院,武汉430074

出　　处：《科学技术与工程》2015年第21期189-194,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51308518);中央高校基本科研业务费专项资金项目(CUGL150412);中国地质大学(武汉)大学生自主创新启航项目(1410491A16)资助

摘　　要：普通墙体珍珠岩保温砂浆在使用过程中易出现脆性大、抗裂及抗渗性能差等问题。为有效改善普通珍珠岩保温砂浆的相关问题,通过加入橡胶粉、聚合物、聚酯纤维对其进行复合改性。采取正交试验方法,通过各影响因素水平的变化,获得新型珍珠岩保温砂浆的工作性能和力学性能变化规律。实验结果表明：丁苯乳液对砂浆的稠度影响最大,珍珠岩次之。珍珠岩、橡胶粉、丁苯乳液和聚酯纤维四种材料对砂浆复合改性之后的新型珍珠岩保温砂浆的抗折强度相对于空白试样降低幅度为17%~45%,抗压强度降低幅度为25%~65%,折压比增大幅度为8%~56%。当改性组分为珍珠岩20%＋橡胶粉10%＋丁苯乳液10%＋聚酯纤维0.050%时,抗折、抗压强度满足规范要求,折压比最大,此时砂浆的柔韧性最佳。通过砂浆的微观结构观察可得,丁苯乳液的掺入能够有效填充砂浆内部的宏观与微观缺陷,提高界面过渡区的密实程度。Regular pearlite mortar behaves badly such as high brittleness, poor crack resistance and impermea- bility at work. In order to solve the problem, rubber powder, styrene-butadiene rubber and polyester together were mixed to change its performance. By adopting orthogonal test and analyzing each effect of changing factor, mechani- cal properties and working performance rule of new pearlite thermal mortar were gained. The result shows ： styrene- butadiene rubber has the greatest effect in the consistency of mortar, and the pearlite is the second one. The new pearlite thermal mortar＇s flexural strength relative to the blank sample one＇s has reduce the range of 17% -45%, and the compressive strength has reduce the range of 25% - 45%, and ratio of bending-compressive strength has improve the range of 8% -56%. When the modifying component is that ：20% of pearlite and 10% of rubber pow- der and 10% of styrene-butadiene rubber and 0. 05 % of polyester, this mortar＇ s flexural strength and compressive strength all meet the specification requirements, and in this time it＇ s ratio of bending-compressive strength is big- gest, mortar＇ s flexibility is the best at this time. Through observing the micro structure, styrene-butadiene rubber stuffing the macro and micro defect inside mortar, enhances the compactness of ITZ consequently.

关 键 词：保温砂浆 珍珠岩 橡胶粉 丁苯乳液 聚酯纤维 

分 类 号：TU528.041[建筑科学—建筑技术科学]