【摘要】 相比于普通轻骨料,矿渣膨珠表观密度高,当用于泡沫混凝土制备时,将出现轻骨料下沉。以矿渣膨珠为轻骨料,采用物理发泡法制备了干表观密度600 kg/m3的矿渣膨珠轻骨料泡沫混凝土,同时引入无机矿物增稠剂钙基膨润土增加体系浆体黏性,阻滞轻骨料下沉。结果表明:钙基膨润土的掺入可有效解决矿渣膨珠下沉问题并提高矿渣膨珠轻骨料泡沫混凝土的密度均匀性,同时也可优化其气孔结构和孔径分布,进而提升泡沫混凝土的力学性能和保温隔热性能。当掺入质量分数1%的钙基膨润土时,泡沫混凝土抗压强度为4. 1 MPa,导热系数为0. 191 7 W/(m·K)。更多还原

【Abstract】 Granulated blast titanium slag lightweight aggregate( GBLWA) has higher apparent density compared with conventional lightweight aggregate. When used in the preparation of foamed concrete,the lightweight aggregate will sink. In this study,GBLWAs were used to prepare lightweight aggregate foamed concrete( LWAFC) with dry density of 600 kg/m3 through physical foaming method. Calcium bentonite was used as inorganic mineral thickener to increase the viscosity of fresh LWAFC slurry,so as to block the sinking of lightweight aggregate. The results show GBLWA can be uniformly distributed in LWAFC without sinking and the density uniformity will also be improved with the addition of calcium bentonite. Pore structures and pore size distribution will be optimized,thus improving the mechanical properties and thermal insulation performance of LWAFC. Compressive strength and thermal conductivity of the LWAFC reach 4. 1 MPa and 0. 191 7 W/( m·K),respectively,when 1% of calcium bentonite is used.更多还原