期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 131, 期 -, 页码 512-516出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2016.11.105
关键词
Foam concrete; Carbon nanotube; Tetraethyl orthosilicate; Physical property; Water absorption; Impedance
资金
- National Natural Science Foundation of China [51208272, 51378270]
- Research Program of Qingdao Application Foundation [14-2-4-48-jch]
- International Study Program of the Excellent Young and Middle Aged Teachers in Shandong Province
- Taishan Scholar
Foam concrete plays an important role on the roof, non load bearing walls and thermal pipe insulation layer application because of its special porous structure and excellent insulation performance. In this paper, the effect of multi-walled carbon nanotube (MCNT) loading (w(MCNT)) on the physical properties, water absorption, and AC impedance (Z) of MCNT reinforced foam concrete (MCNTFC) before and after tetraethyl orthosilicate (TEOS) impregnation were studied. Results reveal, MCNT can improve the pore structure and decrease the average pore diameter of the foamed concrete. When w(MCNT) alters in the range of 0%-0.1%, the dry density of MCNTFC smoothly changes between 290 and 320 kg/m(3), the maximal compressive strength reaches 0.302 MPa, and has the increment of above 27% with respect to the plain; The Z with 0.05% w(MCNT) is the lowest, and W-MCNT has almost no influence on the polar corrosion durability seen from electrochemical Nyquist curves. After TEOS impregnation, and its surface contact angle of MCNTFC is much larger than 90 degrees, and the corresponding maximal water absorption rate is decreased by more than 40%. The surface hydrophobic feature of porous MCNTFC product is good for developing it to a kind of anti-permeable light-weight thermal insulation layer. (C) 2016 Elsevier Ltd. All rights reserved.
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