提高泡沫混凝土抗压强度的研究www.pmhnt.net.doc

提高泡沫混凝土抗压强度的研究 摘要 本文通过实验得出水泥掺加量多少和水化后的抗压强度决定了泡沫混凝土的抗压强度，掺加量越高，泡沫混凝土抗压强度越高；水泥标号越高，泡沫混凝土抗压强度越高。泡沫混凝土中水在满足水泥水化、硬化的前提条件下，水料比越小，混凝土抗压强度越高，反之亦然。在泡沫混凝士中掺入矿渣微粉，能提高泡沫混凝土的抗压强度，尤其在早强剂的作用下，效果更加明显，但过多的矿渣会带迸更多的惰性组分，反而会降低强度，矿渣微粉的掺入量与合理的范围，一般每立方中混凝土不宜超过1OOkg。无机早强剂 CaCl2、Na2S04与三乙醇胺对泡沫混凝土的抗压强度有明显的促进作用，非常适合做泡沫混凝土的早强激发剂。其激发效果次序：三乙醇胺+Na2S04三乙醇胺+CaCl2三乙醇胺 Na2S04 CaCl2。其中，0．1％的三乙醇胺和2．5％的Na2S04复掺的情况下，激发效果最好。 本文还探讨了泡沫混凝土的强度和导热系数与其配合比之间的关系，同时考察了粉煤灰、矿渣等水泥混合材的掺入对泡沫混凝土性能的影响。利用硅酸盐水泥和矿渣、粉煤灰及硅灰等混合材，采用预制气泡后混合的方法制备出高性能泡沫混凝土。当水泥的用量280～650kg/m3，粉煤灰42～97kg／m3，矿渣为64～146kg／m3，硅灰为34～78kg／m3，砂为O～920kg/m3时制成的泡沫水泥混凝土的相应密度为430～1500kg／m3，导热系数为0．16～O．75 W／m·℃，抗压强度为1．1～23．7MPa。控制干燥密度1500kg/m3，选择适当的配合比并添加适量超塑化剂，泡沫混凝土的抗压强度可达44.1 MPa。用本方法制备的泡沫混凝土，由于新拌浆体具有极好的流动性，混凝土浇筑时无需机械振动捣实，特别适用于大体积现场浇筑工程和地下不规则空间的混凝土填充浇筑，也可以在工厂预制成砖块、砌块、墙板等建筑构件。 关键词：泡沫，混凝土，抗压强度，保温，轻质 ABSTRACT 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 oftwo kinds ofexciter，piaster ofparis 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 stu