期刊
CEMENT AND CONCRETE RESEARCH
卷 106, 期 -, 页码 12-22出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2018.01.020
关键词
Foamed concrete; Ultra-stable foam; Nanoparticle modification; Reinforcement; Stabilization mechanism
资金
- National Natural Science Foundation of China [5150080804]
- 973 Program [2015CB655100]
- National Science & Technology Pillar Program [2014BAB15B01-02]
- Technological Development Projects of China Railway Engineering Corporation [2015G002-I, 2015G002-K]
- State Key Laboratory of High Performance Civil Engineering Materials [2016CEM005]
In this study, an ultra-stable foam used for foamed concrete was fabricated by modifying the gas-liquid interface by coupling the effects of an organic surfactant and nanoparticles. A serial of techniques was employed to study the products and microstructure development of foam and foamed concrete, respectively. The results show that nano-silica and hydroxypropyl methylcellulose can slow the coalescence and disproportionation of the bubbles by adsorbing at the air bubble surface and increasing the viscosity of cell wall paste, thus preventing gas transfer and hindering physical drainage between the gaseous and liquid phases. Also, a more homogeneous and finer pore structure is generated with the inclusion of the organic surfactant and nanoparticles. The pozzolanic reaction between the nano-silica and Ca(OH)(2) results in an increased C-S-H content and the densification of the cell wall structure. In addition, the stability of foamed concrete with modification and relevant stabilization mechanisms were also investigated.
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