Asbestos fiber cement boards are still widely used domestically,despite that asbestos can leads to serious and fatal illness such as lung cancer.Nowadays,people concern more about environmental protection and health problem,asbestos-free fiber cement siding boards become more popular.The mechanical properties and durability of the paper pulp fiber reinforeced cement board are studied and the influences of Ca/Si ratio and wollastonite microfiber content are also investigated.The results show that with the Ca/Si molar ratio of raw materials between 0.5～0.6 can produce boards with higher flexural strength.Wollastonite microfiber about 5wt%can also improve the water saturated flexural strength and decrease the water sorptivity.The properties of commonly used boards with and without asbestos are analyzed,and the results indicate that the latter has higher tensile strength perpendicular to face and higher water saturated flexural strength,meanwhile,its freeing-thawing resistance,hot-shower resistance,hot-water resistance,and dry-wet resistance can also meet the requirements of relevant Chinese standards.
NETL
NSTL
维普
万方数据
