Study On Preparation Of Polymer Cement-based Surface Barrier Materials And Properties

With the acceleration of urbanization and industrialization,soil pollution is becoming more and more serious in China.If effective treatment technologies is not adopted,it will cause serious harm to human health and ecological environment.Surface barrier covering technology is an economical and practical management technology for the purpose of risk prevention and control,and it is the key to develop an economical and applicable surface barrier material.Polymer cement-based waterproof material used in the field of construction has shown excellent performance such as good aging resistance,remarkable waterproof effect,high cost performance,strong adaptability to deformation and so on.However,if it is used in the prevention and control of soil pollution risk,the cost is high and the tensile property can not meet the requirements.Therefore,it is necessary to optimize and improve the polymer cement-based waterproof material to improve its performance.In this paper,acrylic emulsion and white cement were used as the main organic and inorganic components to prepare polymer cement-based surface barrier materials with good barrier performance,high cost performance,high tensile strength,high tear strength and certain flexibility.Firstly,the influencing factors of physical properties of polymer cement-based waterproof materials are studied.Secondly,the influence of aluminum sludge on the performance of polymer cement-based waterproof material is studied.Finally,the polymer cement-based waterproof material is used as the matrix to prepare the polymer cement-based surface barrier material by combining with the fetal substrate,and their physical properties are analyzed to provide a theoretical basis for the selection of materials in the surface barrier technology.The main research results are as follows:(1)The effects of the ratio of polymer to cement,additives and the ratio of calcium/quartz powder on the properties of polymer cement-based waterproof materials were studied.The results show that when the ratio of polymer to cement is0.47.The optimal dosage of silane coupling agent,titanate coupling agent QX-311 W,titanate coupling agent QX-201,defoaming agent,film forming agent and dispersant were 1.05%,1.35%,0.75%,0.22%,1.2% and 0.4%,respectively;The optimum ratio of heavy calcium carbonate to quartz powder is 4:1.(2)The addition of aluminum sludge can improve the physical properties and aging resistance of the specimens.When aluminum sludge replaces 20% cement,the comprehensive properties and economic benefits are the best,with 7 d tensile strength of 2.27 MPa,7 d elongation at break of 205.62%,14 d water absorption of 9.06%,tear strength of 13.33 k N /m,and bond strength of 1.42 MPa.Under water,alkali,heat and UV treatment,the retention rates of tensile strength are 114%,118%,153%,125%respectively and the retention rates of elongation at break are 83%,83%,80%,79%respectively.(3)The physical properties of polymer cement-based waterproof materials are improved significantly by the polyester filament geotextile and composite geomembrane(one film one cloth).When the fetal substrate is polyester filament geotextile,the tensile strength,elongation at break and tear strength of the polymer cement-based surface barrier material are 4.81 MPa,91.85% and 36.49 k N/m,respectively.When the fetal substrate is composite geomembrane,the tensile strength,elongation at break and tear strength of the polymer cement-based surface barrier material are 3.4 MPa,138.4% and 28.23 kN/m.