摘要
以钼尾矿、矿粉为主要原料,消石灰和水玻璃为激发剂,采用振动成型法制备了免蒸压砖,研究了钼尾矿用量、养护温度、激发剂种类及用量等因素对免蒸压砖抗压强度的影响,通过SEM、EDS表征了不同龄期的水化产物,分析了其强度形成机理。结果表明:在钼尾矿-矿粉-石灰体系中,添加水玻璃可以提高石灰常温下的碱激发效果,矿粉中所含的硫酸盐可以加快水化反应,促进水化硅酸钙和水化铝酸钙的形成。免蒸压砖最优配比为:钼尾矿65%、矿粉30%、石灰5%,水玻璃掺量为矿粉质量的0.5%,水灰比0.43,按此制得的免蒸压砖28 d抗压强度为37.8 MPa,符合GB/T 21144—2007《混凝土实心砖》中MU35的要求。
This study using molybdenum tailings,slag powder as the main raw material,hydrated lime and sodium silicate as exciting agent,prepared non-autoclaved bricks with vibration molding method,and this article studies the effect of such factors as molybdenum tailings dosage,curing temperature,types and dosage of exciting agent on the compressive strength of autoclaved brick,characterizes the hydration products of different curing age by SEM and EDS,and analyzes its strength formation mechanism.The results showed that:In the system of molybdenum tailing,mineral powder slag-slaking lime,adding sodium silicate can improve the alkali excited effect of slaking lime at room temperature,and the sulfate contained in mineral powder can accelerate the hydration reaction and promote the formation of calcium silicate hydrate and calcium aluminate hydrate.The optimal ratio of non-autoclaved brick is as follows:65%molybdenum tailings,30%mineral powder,5%lime content,0.5%sodium silicate content of mineral powder and 0.43 water-cement ratio.Under this process condition,the 28 d compressive strength of the non-autoclaved brick is 37.8 MPa,which meets the requirements of MU35 grade in GB/T 21144—2007"Solid concrete bricks".
作者
万欣娣
王今华
李建伟
马炎
张茂亮
杜渐
张冰
WAN Xindi;WANG Jinhua;LI Jianwei;MA Yan;ZHANG Maoliang;DU Jian;ZHANG Bing(Henan Building Materials Research and Design Institute Co.Ltd.,Zhengzhou 450052,China;School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《新型建筑材料》
2023年第3期91-94,共4页
New Building Materials
基金
国家重点研发计划项目(2020YFC1908804)
河南省科学院基本科研项目(220609091,220609108)。
关键词
钼尾矿
矿粉
室温养护
免蒸压砖
molybdenum tailings
slag powder
room temperature curing
non-autoclaved brick
