实验参数对固废基发泡混凝土试块性能的影响研究

发布时间：2018-09-11 06:40

【摘要】：以超细粉煤灰和钢渣超微粉为主要原料,配加少量水泥和铝粉发泡剂制备发泡混凝土试块。实验系统考察了不同水灰比、发泡剂掺量、发泡温度对发泡混凝土试块的绝干密度、抗压强度、吸水率和孔隙率的影响。结果表明,铝粉发泡剂掺量从1‰增加到7‰,所得试块的绝干密度和抗压强度分别降低36%和84%;而对应的吸水率和孔隙率增加幅度分别高达79%和30%。水灰比从0.65增加到0.95,所得试块的绝干密度和抗压强度分别降低26%和82%;而对应的吸水率和孔隙率均出现"先增后减"趋势,其中吸水率增加幅度为34%,降低幅度为24%;孔隙率增加幅度为18%,降低幅度为9%。发泡温度从25℃增加到90℃时,试块的绝干密度和抗压强度整体上呈"先降后升"趋势,绝干密度降幅约为30%,升幅约为60%;抗压强度降幅为50%,升幅高达140%。优化后的实验条件为:铝粉掺量1‰~3‰、水灰比65%~75%、发泡温度40℃左右。试块抗压强度与绝干密度随制备条件变化幅度不一致,这说明有可能通过制备工艺优化获得"高强度、低密度"的发泡混凝土产品。
[Abstract]:Superfine fly ash and steel slag ultrafine powder were used as the main raw materials, and a small amount of cement and aluminum powder foaming agent were added to prepare the foamed concrete test block. The effects of water cement ratio, foaming agent content and foaming temperature on the dry density, compressive strength, water absorption and porosity of foamed concrete were systematically investigated. The results show that when the amount of foaming agent increases from 1 鈥，

本文编号：2235914