磷石膏植生混凝土的制备及性能研究  

Study on preparation and properties of phosphogypsum planting concrete

作　　者：魏鹏程 曾辉[2] 杨进[2] 张海龙 储洪强[1] 张风臣[1] 蒋林华[1] WEI Pengcheng;ZENG Hui;YANG Jin;ZHANG Hailong;CHU Hongqiang;ZHANG Fengchen;JIANG Linhua(College of Mechanics and Materials,Hohai University,Nanjing 211100,China;China Changiang Power Co.,Ltd.,Beijing100000,China)

机构地区：[1]河海大学力学与材料学院,江苏南京211100 [2]中国长江电力股份有限公司,北京100000

出　　处：《混凝土》2024年第1期169-173,共5页Concrete

基　　金：江苏省重点研发计划项目(BE2020780);国家自然科学基金(52079048)。

摘　　要：传统护坡由于资源消耗量大、植被存活率较低等问题,正逐步被植生混凝土护坡取代。用固体废弃物磷石膏制备植生混凝土,可提高其综合利用率,减少不可再生资源消耗,还能改善混凝土的植生性能。试验以磷石膏掺量和设计孔隙率为变量,研究磷石膏对植生混凝土抗压强度、实际孔隙率、透砂率、碱度的影响。结果表明,磷石膏植生混凝土的抗压强度随设计孔隙率的增大而减小;当设计孔隙率不变时,抗压强度随磷石膏替代率的增大而减小,7 d抗压强度可达9.0 MPa,28 d抗压强度可达13.7 MPa;磷石膏植生混凝土总孔隙率磷石膏替代率的增加而减小;掺入磷石膏可使植生混凝土的p H值最低降至9.4。Traditional slope protection is gradually replaced by planting concrete slope protection due to the large consumption of resources and the low survival rate of vegetation.Using solid waste phosphogypsum to prepare planting concrete can improve its comprehensive utilization rate,reduce the consumption of non-renewable resources,and improve the planting performance of concrete.The test takes phosphogypsum content and design porosity as variables to study the effect of phosphogypsum on the compressive strength,actual porosity and sand permeability of planting concrete,and select the optimal mix ratio,and conduct alkali reduction treatment by soaking in various solutions.The results show that the compressive strength of phosphogypsum planting concrete decreases with the increase of design porosity.When the design porosity is constant,the compressive strength decreases with the increase of phosphogypsum replacement ratio,and the compressive strength can reach 9.02 MPa at 7 d and 13.65 MPa at 28 d;The total porosity of phosphogypsum planting concrete is mainly determined by the design porosity,and decreases with the increase of phosphogypsum replacement rate;The lowest pH value of planting concrete can be reduced to 9.4 by adding phosphogypsum.

关 键 词：植生混凝土 磷石膏 抗压强度 孔隙率 碱度 

分 类 号：TU528.2[建筑科学—建筑技术科学]