泡沫混凝土孔隙结构的试验研究

Experimental Study on Pore Structure of Foam Concrete

为开展泡沫混凝土细观孔隙结构的研究,采用正交试验法研究水胶比、粉煤灰掺量和砂胶比等三项因素对泡沫混凝土孔隙率和等效平均孔径的影响。试验结果表明:孔隙率具有随水胶比和粉煤灰掺量增大而减小、随砂胶比增大而增大的特征,粉煤灰掺量和砂胶比因素的影响较为显著;等效平均孔径与水胶比、粉煤灰掺量和砂胶比均呈正相关关系,对600级泡沫混凝土三项影响因素的极差分别为0.045、0.097和0.079,粉煤灰的影响最为显著;对900级泡沫混凝土三项影响因素的极差分别为0.031、0.036和0.073,砂胶比的影响最大,且粉煤灰的需水量对平均孔径的影响较大。

For carrying out a research on the mesoscopic pore structure of foam concrete,the orthogonal test was conducted to study on the fly ash content,water-binder ratio and sand-binder ratio＇s influence to porosity and the equivalent mean pore size of foam concrete. The test results shown that the porosity tends to decrease when water-binder ratio and fly ash content lessen and increase while sand-binder ratio raised,in which the influence of fly ash content and sand-binder ratio was remarkable. The equivalent mean pore size was positively correlated with water-binder ratio,fly ash content as well as sand-binder ratio,its range of three factors about 600 grade foam concrete were 0. 045,0. 097 and 0. 079 respectively and the influence of fly ash was the most notably; its range of three factors about 900 grade foam concrete were 0. 031,0. 036 and 0. 073 respectively while the sand-binder ratio had the greatest influence,and the water requirement of the fly ash had a great influence on the mean pore size.