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| Influences of KH550 Modified SiO2 Aerogel on Mortar Property |
| Received:July 12, 2016 Revised:January 15, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2017.01.017 |
| KeyWord:silane coupling agent thermal insulation mortar SiO2 aerogel mechanical properties shrinking rate thermal conductivity coefficient |
| Author | Institution |
| LIU Zhao-hui |
Dept of Chemistry & Material Engineering, Logistic Engineering University of PLA, Chongqing , China |
| DING Yi-dong |
Dept of Chemistry & Material Engineering, Logistic Engineering University of PLA, Chongqing , China |
| WANG Fei |
Dept of Chemistry & Material Engineering, Logistic Engineering University of PLA, Chongqing , China |
| BAN Guo-dong |
Dept of Chemistry & Material Engineering, Logistic Engineering University of PLA, Chongqing , China |
| LIN Rui |
Dept of Chemistry & Material Engineering, Logistic Engineering University of PLA, Chongqing , China |
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| Abstract: |
| Objective To improve compatibility between SiO2 aerogel and mortar and reduce the thermal conductivity of mortar. Methods SiO2 aerogel mortar was prepared by equal volume replacement method using the modified SiO2 aerogel particles which were modified by the mass fraction of 5% KH550 silane coupling agent as modifier to replace sand. Properties of raw materials and microstructure of mortar were characterized via SEM, XRD, FTIR and contact angle gauge. Effects of different aerogel contents of SiO2 aerogel particles on the density, mechanical properties, shrinkage performance, thermal conductivity, etc. were also investigated. Results The SiO2 aerogel which was modified by silane coupling agent of KH-550 could be set in the mortar stably. It was more closely combined with inorganic gelled material and it could make up holes in mortar, make internal structure of mortar more uniform, and form relatively stable composite system. As replacement rate of SiO2 aerogel particles increased, density, mechanical properties and thermal conductivity of SiO2 aerogel mortar decreased and shrinkage rate increased gradually. When the replacement rate reached 60%, the density decreased from the original 2014.1kg/m3 to 1231.4kg/m3, the compressive and fracture strength of 28 days dropped to 2.15MPa and 0.45 MPa respectively. The value of thermal conductivity fell from 0.6039 W/(m•K) to 0.1524 W/(m•K), and the shrinkage increased to 2729×10-6. Conclusion Under the comprehensive consideration of usability, material cost and insulation performance, etc., the optimal volume fraction is achieved when the replacement rate is 50%. At this point, its density, compressive strength, rupture strength, shrinkage rate and thermal conductivity coefficient are 1387.1 kg•m-3, 8.3 MPa, 2.23 MPa, 1928×10-6 and 0.2248 W/(m•K) respectively.. |
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