甲基硅酸钠改性发泡石膏性能的试验研究
Experimental Study on Properties of Sodium Methyl Silicate Modified Foamed Gypsum
韩月 1谢辉 1刘俊超1
作者信息
- 1. 重庆大学建筑城规学院,重庆 400045;重庆大学山地城镇建设与新技术教育部重点实验室,重庆 400045
- 折叠
摘要
为提高脱硫石膏的耐水性,拓宽其在室内潮湿环境中的应用范围,本试验以烟气脱硫石膏(FGD)、白色硅酸盐水泥为主要原料,采用复合发泡工艺,制备了 1种新型耐水型多孔石膏吸声材料.通过内掺甲基硅酸钠(SM)及表面喷涂SM共2种方式对发泡石膏进行改性实验,研究SM对改性发泡石膏力学性能、耐水性能和吸声性能的影响.结果表明:内掺2.59 wt％的甲基硅酸钠后降噪系数(NRC)提高22.22％,且315～2 000 Hz频段吸声性能明显增强;随甲基硅酸钠含量从0 wt％增至2.59wt％,中低频吸声系数逐渐增大,表面接触角也从0°增至120.4°.表面喷涂2 ml浓度为30％的甲基硅酸钠可增强材料耐水性,吸水率较基准组下降25.18％,表面接触角从0°扩大至143.4°,NRC较基准组持平.通过扫描电镜观察材料的微观结构后发现:内掺甲基硅酸钠通过增大材料的孔径和微孔数量,增强发泡石膏的中频(250～2 000 Hz)吸声性能.
Abstract
In order to improve the water resistance of flue gas desulfurization gypsum(FGD)and expand its application scope in an indoor humidity environment,a kind of water-resistant porous gypsum sound absorption material based on FGD and Portland cement was prepared by composite foaming process.Through the two ways of internal doping sodium methylsilicate(SM)and surface spraying SM,the foamed gypsum experiments were conducted to study the effects of modified foamed gypsum mechanics,water resistance,and sound absorption properties.The results showed that the noise reduction coefficient(NRC)was increased by 22.22％after internal doping with 2.59wt％SM,and the sound absorption of 315～2 000 Hz was significantly enhanced.With the SM content increased from 0wt％to 2.59wt％,the low-frequency sound absorption coefficient gradually increased.The surface contact angle also increased from 0° to 120.4°.Surface spraying 2 ml 30％SM can enhance the water resistance of the material.The water absorption rate was reduced by 25.18％,and the surface contact angle expanded from 0° to 143.4°.The NRC was the same as the baseline group.The micro-structure of the material was observed by SEM,and results show that inner doping SM improves medium frequency sound absorption(250～2 000 Hz)by increasing the pore size and number of micro-pores of the material.
关键词
甲基硅酸钠/脱硫石膏/发泡石膏/微观结构/耐水性能/吸声性能Key words
sodium methylsilicate/desulfurization gypsum/foamed gypsum/micro-structure/waterproof property/sound absorption properties引用本文复制引用
基金项目
国家自然科学基金项目(52078077)
中央高校基本科研业务费资助项目(2021CDJYGRH-001)
出版年
2024
NETL
NSTL
万方数据