摘要
通过喷淋-热辐射和碳化-喷淋试验,研究了环境因素对普通和高性能玻镁外挂墙板(GRMCS)弯曲性能的影响,并采用X射线衍射和扫描电镜分析了环境因素影响下GRMCS的劣化机理.结果表明,GRMCS在喷淋-热辐射循环侵蚀条件下的抗弯强度保留率均在80%以上,而在碳化-喷淋循环侵蚀条件下,普通GRMCS的抗弯强度保留率仅为48.88%.在喷淋-热辐射循环侵蚀条件下,普通GRMCS中Mg(OH)_2含量明显比高性能GRMCS中Mg(OH)_2含量高,且其微观结构酥松;在碳化-喷淋循环侵蚀条件下,普通GRMCS的主要强度相5Mg(OH)_2·MgC_l2·8H_2O(5·1·8)相基本消失,最终产物为4MgCO_3·Mg(OH)_2·4H_2O(4·1·4)相和MgCO_3,而高性能GRMCS的主要物相仍为5·1·8相.高性能GRMCS纤维表面光滑,而普通GRMCS则出现了较多的腐蚀微孔,说明高性能GRMCS较普通GRMCS具有更好的耐久性.
The effects of the environmental factors on the bending performance of common glass fiber reinforce magnesium oxychloride cement exterior cladding wall(GRMCS) and high performance GRMCS were studied by using the spray-heat radiation and carbonization-spray tests.The degradation mechanism of the GRMCS under the influence of the environmental factors was analyzed by using Xray diffraction and scanning electron microscopy.The results show that the flexural strength retention rate of the GRMCS under spray-heat radiation is above 80%,while that of the common GRMCS specimen in the carbonization-spray experiments is only 48.88%.After the spray-heat radiation cyclic erosion,the content of Mg(OH)_2 in the common GRMCS specimen is significantly higher than that in the high performance GRMCS,and loose structures are observed in the common GRMCS.After the carbonation-spray cyclic erosion,the 5 Mg(OH)_2·MgCl_2·8 H_2O(5·1·8)phase,the major strength phase in the common GRMCS,disappears,and the final hydration product are 4 MgCO)3·Mg(OH)_2·4 H)2O(4·1·4) phase and MgCO_3,while the main phase in the high performance GRMCS is still 5·1·8 phase.The surface of the high performance GRMCS is smooth,while many corrosion pits are observed on the surface of the common GRMCS,indicating that the high performance GRMCS outperforms the common GRMCS in durability.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第6期1201-1207,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(21276264
U1407104
U1507120)
中国科学院"百人计划"资助项目
关键词
玻镁外墙挂板(GRMCS)
喷淋
碳化
热辐射
微观结构
glass fiber reinforce magnesium oxychloride cement exterior cladding wall(GRMCS) spray
carbonation
thermal radiation
microstructure
