Influence of Polymers on Strength and Micro Structure of Portland Cement Paste
In order to find the absorption principle between polymer and cement, compressive strength and surface tension were tested and inspection of the fresh paste and Ca(OH)2 crystal was carried out using optical microscope. The results showed that when the hydroxypropyl methylcellulose (HPMC) was added into cement paste with the weight ratio of HPMC/cement under 0.1％, the compressive strength of the hardened paste and the surface tension of the water solution of the HPMC show similar change tendency. Optical microscope was used to inspect the pure Ca(OH)2 crystal and Ca(OH)2-HPMC mix crystal. The states of two crystals were obviously different in profile, transparency and accumulation. For the Ca(OH)2 crystal producing from hydration of cement is considered to be a factor which could influence the compressive strength of cement paste, the relation might be that HPMC has some reaction with water molecules and the activity of water molecules influence the Ca(OH)2 crystals production and further influence the compressive strength of cement paste. At the meantime, the polymer film forming on the surface of cement hydration product was viewed under optical microscope for the natural experiment environment. The result showed that the lucent and bright film forms on round cement knots and in worm-like canals.
molecular function crystal type polymer film
Bin Zhang Mingzhong Chen Shiyun Zhong
Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education Sh Shanghai WEIGU engineering Co., Ltd.Shanghai 200237, China Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education Sh
国际会议
6th Asian Symposium on Polymers in Concrete(第六届亚洲聚合物混凝土国际会议)
上海
英文
299-305
2009-10-29（万方平台首次上网日期，不代表论文的发表时间）