Effect of Polymer Utilization on the Properpies of Cement-based Materials

• Main Authors: Cheng-Hsin Cnen, 陳振欣
• Other Authors: R.Huang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/76087131825095942245

博士 === 國立臺灣海洋大學 === 材料工程研究所 === 93 === Abstract This study is aimed to investigate the effect of polymer application on the properties of cement-based materials using material testing method. Testing variables include monomer mixture, impregnation temperature and duration, dosage of MMA monomer, and the application amount of E/G particles. Testing program includes SEM observation, MIP measurements, strength tests, absorption and sorptivity tests, and chloride ion penetration test, etc. SEM microscopy indicates PMMA connects as a linear structure, PEGDMA as a planar structure, and PTMPTMA as a block structure. Specimens with 30% EGAMA or TMPTMA have higher planar or block structures than the specimens with 15% addition. PIC specimens immersed in monomer mixture for 12 hours and polymerized in 70~80℃ water for 6 hours have higher compressive strength, splitting tensile strength, elastic modulus, and resistivity than the control specimens. MIP results reflect that the filling effect of polymer is more prominent in higher water/ratio specimens and the critical pore diameter for PIC specimens is about 50 nm, which is much larger than that of the control specimen (10 nm). The 6-hour accumulated total charge passed and chloride diffusion coefficient of PMC specimens is much lower than those of normal concrete specimens. Polymer modification appears to be effectively to reduce the porosity and minimize the pore size of cement-based composites. The workability of E/G particle concretes are adversely affected by the fine particle size and suitable super-plasticizer should be added in E/G1 and E/G2 mixes. Specimens with 20% E/G particle addition have better quality in comparison with normal specimens, which may result from the filling effect of fine particle or reaction of SiO2 from E/G particle. In general, E/G particle concrete specimens have higher ultrasonic velocity, resistivity, sulfate resistance, and lower absorption than the specimens without E/G particle addition. Keywords：PIC, PMC, soaking time, polymerization temperature, monomer mixture, initiator, E/G particle