高性能混杂纤维增强膨胀混凝土在硫酸镁溶液中的抗腐蚀性能  

Resistance of High Performance Hybrid Fibers Reinforced Expansive Concrete Exposed to Magnesium Sulfate Solution

作　　者：杨礼明[1] 余红发[1] 麻海燕[1] 白康[2] 曹文涛[2] 

机构地区：[1]南京航空航天大学土木工程系,南京210016 [2]江苏省交通科学研究院股份有限公司,南京211112

出　　处：《硅酸盐通报》2011年第4期764-769,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家973计划项目(2009CB623203);江苏省自然科学基金前期预研项目(BK2005216);2008年西宁市建设委员会项目(2010-001);2010浙江省建设厅科技项目(1006)

摘　　要：采用自然浸泡和干湿循环的方法,研究了粉煤灰混凝土(FAC)、高性能混凝土(HPC)和高性能混杂纤维增强膨胀混凝土(HPHFREC)在5%硫酸镁溶液中的相对动弹性模量变化和质量损失规律。实验结果表明:硫酸镁环境对混凝土具有严重腐蚀性;干湿循环加速混凝土的表面剥落,对混凝土的抗硫酸镁腐蚀性能有劣化作用。在5%硫酸镁中自然浸泡,HPHFREC2具有优良的抗腐蚀性能,三元纤维混杂起到良好的增韧阻裂作用;在干湿循环+硫酸镁双重破坏因素作用下,HPC有较好的抗腐蚀性能,而HPHFREC的纤维增强效果不佳,表面剥落严重,抗腐蚀性能不理想。In this paper, the relative dynamic modulus of elasticity （RDME） and mass loss of fly ash concrete （FAC）, high performance concrete （HPC）, and high performance hybrid fibers reinforced expansive concrete （I-IPHFREC） exposed to 5% magnesium sulfate solution was investigated. Two corrosion regimes were conducted in natural immersion and dry-wet cycles. The results show that the erosion of concrete in magnesium sulfate environment is severe and the dry-wet cycles accelerates the surface peeling of concrete and has the negative effect to the resistance of concrete to magnesium sulfate attack. HPHFREC2 shows the outstanding resistance of concrete in the natural immersion of 5% magnesium solution and gets an obvious reinforced effect of three type hybrid fiber. Subjected to the combined action of dry-wet cycles and magnesium sulfate, HPC has the best resistance, oppositely, the resistance of HPHFREC is unexpected of which the surface peeling is severe and the reinforced effect of the fiber is not available.

关 键 词：混凝土 硫酸镁 干湿循环 相对动弹性模量 质量损失 

分 类 号：TU528[建筑科学—建筑技术科学]