Fundamental Studies on Plasticity of Polymer-Modified Cement Based Composite Materials Using PEG
Kazuo SEKINO
Abstract:In recent years, polymer-modified cement based materials composites(PMC) have been used for siding, panel, etc. produced by extrusion molding. The purpose of this study is to evaluate plasticity of the PMC using a water-soluble polymer, namely PEG(polyethylene glycol). The PMC were prepared with various water-powder ratios, polymer-cement ratios, replacing ratios of Mg-rich silicate mineral to silica, and conducted by compression test and penetration resistance test. After the compression test, the shape retention and the fluidity in the plasticity of the PMC were discussed by apparent elastic modulus obtained from the initial slope of stress-strain curve , and by work calculated from area under load-displacement curve, respectively.The results obtained are as follows :(1)The apparent elastic modulus of the PMC was increased with decreasing water-powder ratio, and in particular, provided a noticeable increase with increasing the polymer-cement ratio.(2) The work of the PMC was increased with raising the water-powder ratio, and decreased with an increase in the polymer-cement ratio.(3)The apparent elastic modulus and the work of the PMC were increased with an increase in replacing ratio of Mg-rich silicate mineral to silica.(4)There was a correlation between the apparent elastic modulus and the work of the PMC.(5)The plasticity of the PMC was improved with increasing the polymer-cement ratio.(6)The penetration resistance of the PMC was highly correlated with the apparent elastic modulus tested to the compression.(7)From these results, it was recognized that the plasticity of the PMC produced extrusion molding was able to evaluate by compression test . Key Words:Polymer-modified cement, Plasticity, Shape retention, Fluidity, Polyethylene glycol, Apparent elastic modulus, Work, Penetration resistance