纳米改性CFA-MSWI复合地聚合物的耐久性  

Durability of Nano-Modified CFA-MSWI Fly Ash Composite Geopolymer

作　　者：郭晓潞[1,2] 施惠生[1,2] 董文靖[2] 

机构地区：[1]先进土木工程材料教育部重点实验室(同济大学),上海201804 [2]同济大学环境材料研究所,上海201804

出　　处：《水泥技术》2014年第2期30-34,共5页Cement Technology

基　　金：国家自然科学基金(51172164和51208370);教育部博士点基金(20110072120046);中央高校基本科研业务费专项资金(0500219170)

摘　　要：利用城市垃圾焚烧飞灰(MSWI)和高钙粉煤灰(CFA)制备地聚合物,并采用纳米SiO2和γ-Al2O3对MSWI-CFA复合地聚合物进行改性研究,研究了纳米改性复合地聚合物的耐久性。结果表明:MSWI-CFA复合地聚合物本身具有很好的耐高温性能;化学侵蚀对复合地聚合物的影响依次为HCl溶液>NaOH溶液>Na2SO4溶液。纳米微粒对MSWI-CFA复合地聚合物的干缩性能、抗化学侵蚀性能和耐高温性能均有较好的改善作用,且纳米SiO2对地聚合物的改善作用优于纳米γ-Al2O3。SEM和BET研究进一步证实,纳米微粒能够有效改善地聚合物的微观结构和孔结构,使地聚合物大孔体积减少,体系结构更为致密,增强了地聚合物的耐久性。The geopolymers were explored and prepared from municipal solid waste incineration fly ash （MSWI） and class C fly asia （CFA）. The durability of geopolymers modified by nano-partieles of SiO2 and γ-A12O3 was studied. The resuhs show thal the CFA-MSWI fly asia composite geopolymers have good high-temperature resistance. The negative effects of chemical corrosion on the composite geopolymers were HCI 〉NaOH 〉Na2SO4 solution. The dry shrinkage, chemical corrosion resistance and high temperature resistance could be improved by nano-partieles anti the effect of SiO2 was better than that of γ-Al2O3. SEM and BET results further confirmed that mierostructure and pore structure of the geopolymers could be modified effetively by nano-partieles whichean reduce volume of the large pores, compact system structure, and strengthen durability of the geopolymers.

关 键 词：垃圾焚烧飞灰(MSWI) 高钙粉煤灰(CFA) 地聚合物 纳米微粒 耐久性 

分 类 号：TQ317[化学工程—高聚物工业]