Improve The Compressive Strength Of Foam Concrete

In the thesis, the effects of cement and vesicant, ratio between water and solid materials, early intensifier and micron slag powder on the compression strength of cement-mortar foamed concrete have been studied. The relation between the compression strength of the net cement foamed concrete and its proportion, the relation between the compression strength of the cement-mortar foamed concrete and its proportion, the relation between the compression strength of the net cement foamed concrete and its proportion when different slag and coal cinder powder are mixed. The effects of two kinds of exciter, plaster of paris and sodium sulfate of the growth of intensity, especially forepart intensity of the cement-mortar foamed concrete have also been studied. The conclusions is deduced that the compression strength of the foamed concrete in different level may decrease if sand and admixtures are added into cement. However, if two kinds of exciter with 2% are added, the compression strength of the foamed concrete will increase 30% in 14 days.Furthermore, the connection between the compression strength and thermal conductivity of the foamed concrete and its proportion has also been studied. Through pre-foaming process, foamed concrete with good performance has been prepared from Portland cement, slag, coal cinder powder, and silica powder. When its raw material consumption is as follow, cement 280~650kg/m~3 , coal cinder powder 42-97kg/m~3 , slag 64~146kg/m~3 , silica powder 34~78kg/m~3, sand 0~920kg/m~3, the density of the foamed concrete is about 430-1500kg/m~3, its thermal conductivity is about 0.16-0.75W/(m.℃) and its compression strength is about l.l-23.7MPa. If dry density is controlled to 1500kg/m~3, with proper proportion and adding suitable super plasticizer, the compression strength can reach 44.1MPa. It has excellent flow ability and especially suitable for the application in case of massive foamed concrete site casting and in case of filling casting into underground irregular void of that foamed concrete produced by this process. Besides, it also may be widely used for the pre-casting building components like blocks, bricks and wallpanels.