废玻璃粉对泡沫混凝土性能和微观孔结构的影响及其价值工程分析  

Effect of Waste Glass Powder on Properties and Micro Pore Structure of Foamed Concrete and Its Value Engineering Analysis

作　　者：尹鹏翔 李静[1] YIN Pengxiang;LI Jing(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学土木与交通学院,广州510641

出　　处：《硅酸盐通报》2024年第3期1021-1029,共9页Bulletin of the Chinese Ceramic Society

摘　　要：玻璃研磨成粉后的主要成分与粉煤灰相似,具备潜在的火山灰活性。为提高我国对废弃玻璃的循环利用率,将泡沫混凝土与废玻璃粉结合用于改善泡沫混凝土性能,减少水泥消耗量,提高废玻璃的循环利用率。本文研究了以废玻璃粉作为胶凝材料替代部分水泥,并探究废玻璃粉对泡沫混凝土抗压强度、干密度、干缩率、软化系数等的影响。结果表明:在替代胶凝材料总质量的0%~30%(质量分数,下同)时,废玻璃粉会提高泡沫混凝土的抗压强度;且在废玻璃粉掺量为20%时,泡沫混凝土28、56 d抗压强度达到最大值;而在120 d时,废玻璃粉掺量为30%的泡沫混凝土抗压强度达到最大值。废玻璃粉会降低泡沫混凝土的干缩值,且掺量越大,干缩值的降低程度越大,这有助于解决泡沫混凝土易开裂的问题。废玻璃粉能够明显提高泡沫混凝土的软化系数,便于其在潮湿或水下环境应用。此外,从微观孔结构的角度对废玻璃粉引起的泡沫混凝土力学及耐久性能的变化规律做出解释,最后对废玻璃粉引入泡沫混凝土后的价值进行分析,定量证明了废玻璃粉的环保性和经济性。The main composition of glass after grinding is similar to that of fly ash,which has potential pozzolanic activity.In order to improve the recycling rate of waste glass,the combination of foamed concrete and waste glass powder is used to improve the performance of foamed concrete,reduce cement consumption and enhance the recycling rate of waste glass.The effect of waste glass powder used as cementitious material to replace part of cement on compressive strength,dry density,drying shrinkage rate and softening coefficient of foamed concrete were studied.The results show that compressive strength of foamed concrete can improve by adding waste glass powder content within 0%~30%(mass fraction,the same below)of total mass of alternative cementitious materials.When waste glass powder content is 20%,the compressive strength of 28 and 56 d reach the maximum value,while the compressive strength of foamed concrete with 30%waste glass powder content reaches the maximum value at 120 d.Waste glass powder reduces the dry shrinkage value of foamed concrete,and the greater the content,the greater the reduction of dry shrinkage value,which helps to improve the problem of foamed concrete easily to crack.The addition of waste glass powder can significantly improve the softening coefficient of foamed concrete,which is conducive to its application in wet or underwater environments.In addition,from the perspective of changes of micro pore structure,the rules of mechanical and durability properties of foamed concrete caused by waste glass powder were explained.Finally,by analyzing the value of foamed concrete with waste glass powder,its environmental protection and economy were quantitatively proved.

关 键 词：废玻璃粉 泡沫混凝土 力学性能 耐久性能 微观孔结构 价值工程分析 

分 类 号：TU551.33[建筑科学—建筑技术科学]