Accelerated carbonation curing of 5% ethylene/vinyl acetate copolymer modified low heat portland cement paste

作者：Chen Deping^*; Sakai Etsuo; Ohba Yoko; Daimon Masaki

来源：Journal of the Chinese Ceramic Society, 2006, 34(10): 1263-1269.

• Carbon dioxide absorption
• Ethylene vinyl acetate (EVA) copolymer
• Low heat portland cement (LHC)
• Pore size distribution
• Quantitative analysis
• Vaterite

Carbonation curing was adopted to accelerate the hydration of low heat portland cement (LHC) paste modified with 5% ethylene/vinyl acetate copolymer(EVA). The phase composition and the hydration rate of C3S and C2S were tested by X-ray powder diffraction and quantitative analysis. The amount of absorbed CO2 was measured by a total organic carbon analyzer equipped with a solid sample module. The pore size distribution was determined with mercury intrusion porosimetry. The results show that hydration of LHC is greatly accelerated by curing in CO2, accompanied with the formation of vaterite. The total pore volume of the paste decreases considerably after curing, but a significant number of larger capillary pores remaines. These larger capillary pores are reduced by precuring in water before carbonation curing; however, it leads to a low hydration rate of the cement, and results in a remarkable decrease of both the amount of absorbed CO2 and the bending strength.

• 出版日期2006
• 单位北京科技大学