Chemical Resistance and Water Ezclusion Properties of Natural Rubber Latez-modified Concrete (NRL-MC)
Deterioration of concrete due to chemical aggression normally through transporting agents is a serious menace to the two major qualities of concrete; strength and durability. This paper reports the findings of a study conducted to assess the effect of natural rubber on resistance to the ingress of sodium sulphates (Na2SO4) and moisture into hardened concrete. Two principal categories of concrete (normal and modified) involving different grades and sizes were developed. Latex concentrate consisting of several centrifuged clonal latices is used. The quantity of the latex was varied from 0 - 5％ and 0 - 10％ latex/water (L/w) ratios for the chemical resistance and water absorptions respectively. A simulated aggressive medium containing 2.5％ Na2SO4 serves as the curing environment for the chemical detections. Results have shown that attack due to Na2SO4 and moisture absorptions are seriously influenced by the amount of latex added into the mix and period of exposure. It is further comprehended that the general moisture ingress is significantly affected by concrete grade and size. In fact, within the time frame considered in this work, the optimum amount of latex concentrate for maximum resistance to Na2SO4 penetrations is 1.5％ (L/w) and that of minimum water absorption is 5％ (L/w). The outcome of the work therefore, identifies and indicates the level of efficiency and importance of using appropriate quantity of latex concentrate in the modification process of normal concrete, especially in the areas of sulphates attack and water ingress.
latez-modified concrete natural rubber latez latez concentrate chemical resistance sodium sulphates and water absorption
Mohammad Ismail Bala Muhammad Nur Aiza Mohamad
Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor Bahru, Johor, MALAYSIA
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
393-399
2009-10-29（万方平台首次上网日期，不代表论文的发表时间）