The titled high performance foamed concrete was developed from Portland cement, ultra fine granulated blast-furnace slag, pulverized fly ash and condensed silica fume by means of pre-foaming process. The resultant foamed concrete presents its thermal conductivity of about 0.16-0.75 W/(m·℃) and 28 d compressive strength of about 1.1-23.7 MPa when its mix proportion varies in the range of cement content 280 kg-650 kg/m3, fly ash 42-97 kg/m3, slag 64-146 kg/m3, silica fume 34-78 kg/m3, and sand 0-920 kg/m3. The compressive strength of the foamed concrete with oven dried bulk density of 1500 kg/m3 in appropriate mix proportion and with small amount of superplasticizer reached as high as 44.1 MPa. Meanwhile, the fresh foamed concrete behaves like an excellent flow-ability, therefore, is especially suitable for the application in case of massive foamed concrete casting in situ and in the case of filling casting into large volume underground irregular voids, except for pre-casting of building components like blocks, bricks, and wall panels.
参考文献
| [1] | A M Neville.Properties of Concrete[M].London:Pitman,1973 |
| [2] | E.P. Kearsley;P.J. Wainwright .The effect of high fly ash content on the compressive strength of foamed concrete[J].Cement and Concrete Research,2001(1):105-112. |
| [3] | E.P. Kearsley;P.J. Wainwright .Porosity and permeability of foamed concrete[J].Cement and Concrete Research,2001(5):805-812. |
| [4] | E.P. Kearsley;P.J. Wainwright .The effect of porosity on the strength of foamed concrete[J].Cement and Concrete Research,2002(2):233-239. |
| [5] | E.P. Kearsley;P.J. Wainwright .Ash content for optimum strength of foamed concrete[J].Cement and Concrete Research,2002(2):241-246. |
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