SiO2气凝胶在粉煤灰基地质聚合物中的稳定性

关键字：SiO2气凝胶,地质聚合物,接触角,稳定性

[中国矿业大学（北京） 化学与环境工程学院，北京  100083]

    摘要：以SiO2气凝胶（AG）、粉煤灰（CFA）、钠水玻璃和氢氧化钠（NH）为主要原料制备气凝胶-粉煤灰基地质聚合物。通过调节氢氧化钠浓度（0～8 mol/L）和蒸养温度（20～80 ℃），研究AG在粉煤灰基地质聚合物中的稳定性。结果表明：AG与不同NH浓度的碱激发剂溶液接触角均大于130°，当NH浓度为6 mol/L时，接触角最大为140.2°；且当蒸汽养护温度达到80 ℃时，AG在地质聚合物中均能稳定存在；当蒸养温度为60 ℃、NH浓度为6 mol/L时，气凝胶-粉煤灰基地质聚合物的150 d抗压强度达到29.0 MPa，AG可以在地质聚合物中长期稳定存在。
    关键词：SiO2气凝胶；地质聚合物；接触角；稳定性
    中图分类号：TU55+1.3          文献标识码：A          文章编号：1001-702X（2017）02-0090-04

Stability of SiO2 aerogel in coal fly ash-based geopolymer
LI Duanle，CUI Yong，LIU Ze，WANG Dongmin，WANG Fujie
（School of Chemical and Environment Engineering，China University of Mining and Technology Beijing，Beijing 100083，China）

    Abstract：SiO2 aerogel（AG），coal fly ash（CFA），sodium silicate and sodium hydroxide（NH） were used to prepare aerogel-coal fly ash-based geopolymer. By adjusting the concentration of NH（0～8 mol/L） and steam temperature（20 to 80 ℃），the stability of AG in coal fly ash-based geopolymer was investigated. The experimental results showed that the contact angle of AG with different concentration of NH of alkali activator solution all larger than 130°，when the concentration of NH was 6 mol/L，the contact angle is the largest of 140.2°. And when the steaming temperature reached to 80 ℃，AG was still stable in geopolymer. When the steam curing temperature was 60 ℃ and the concentration of NH was 6 mol/L，the 150 d compressive strength of AG/CFA lightweight GEO reached 29 MPa and AG can be long-term stability in GEO.
    Key words：SiO2 aerogel，geopolymer，contact angle，stability