玻璃纤维增强水泥耐久性研究的进展

玻璃纤维增强水泥(GRC)具有抗拉、抗弯、抗冲击、重量轻等多种优点。但长期性能降低限制其在更大范围内使用。对其长期性能降低的机理,国内外有许多学说,也提出了多种改善其耐久性的措施,例如改变玻璃纤维化学成分、基体改性、玻璃纤维表面涂覆处理、界面改善等。目前,其耐久性研究面对着确定加速老化试验方法及标准、搞清长期潮湿环境下GRC性能降低的机理、降低低碱度水泥的高成本、进一步改善普通硅酸盐水泥经掺合料改性后引起的早期强度降低和玻璃纤维性能等课题。

PROGRESS OF RESEARCH ON DURABILITY OF GLASS FIBER REINFORCED CEMENT

The glass fiber reinforced cement GRC has several advantages such as good tensile strength, good bending strength, good shock strength and light weight. Its usable range is restricted by reducing performance for a long time. There are many theories for that mechanism in China and abroad. Several measures for improving its durability are put forward such as changing the chemical composition of glass fibers, changing performance of its matrix, treating the surface coating of glass fibers, improving the interface, etc. At present, the study of its durability is facing how to determine the testing method and standard of accelerated ageing, to understand the mechanism of reducing GRC performance under wet envornment for a long time, to reduce the high cost of low alkalinity cement, and to further improve the earlier stage strength reduction of the common silicate cement with admixtures after changing performance, and the galss fiber performance.