纤维增强高性能混凝土在醋酸钙镁溶液中的抗腐蚀性

Resistance Corrosion of Fiber Reinforced High Performance Concrete in the Calcium Magnesium Acetate Solution

以醋酸钙镁(CMA)为主要成分的机场道面除冰液对道面高性能混凝土(HPC)具有一定的腐蚀性,纤维增强高性能混凝土(FRHPC)在机场道面除冰液中的腐蚀未知。进行了FRHPC试件在浓度为25%的CMA溶液中的浸泡实验,测定了腐蚀过程中混凝土试件的单位表面积剥蚀量和相对动动弹性模量,跟踪了试件表面的剥落特征,比较了HPC和FRHPC的抗CMA腐蚀性。结果表明:HPC和低弹性模量纤维试件FRHPC1经过1522 d腐蚀,单位表面积剥蚀量均显著增长,相对动弹性模量均在90%以上,HPC表面产生较强的剥蚀,FRHPC1表面产生严重剥蚀;高弹性模量纤维试件FRHPC2经过1522 d腐蚀,单位表面积剥蚀量增长微弱,相对动弹性模量保持在100%以上,表面出现少量剥蚀。采用混杂纤维FRHPC3经过1522 d腐蚀,单位表面积剥蚀量几乎没有变化,相对动弹性模量更是超过110%,表面完好无损。因此,混凝土纤维弹性模量越高抗表面剥蚀效果越好,尤其混杂纤维混凝土抗表面剥蚀效果非常明显。

As the main composition of airport pavement deicers, （CMA） has some corrosive to the pavement of high performance acetic acid calcium magnesium acetate concrete （HPC）. It is unknown for fiber reinforced high performance concrete（FRHPC） in airport pavement deicers. In this paper, the specimen FRHPC at the concentration of CMA solution immersion experiments in 25%. The denudation and the relative dynamic modulus of the unit surface area are measured. The surface exfoliative characteristics are observed. The corrosion resistance between the HPC and the FRHPC in 25% CMA are compared. The results show that： the HPC and the low modulus fiber specimens FRHPC1 being etched in 25% CMA for 1522 d, the denudation of the unit surface area are significantly increased. The relative dynamic elastic modulus are up to 90%. The HPC surface to form strong denudation, however, the FRHPC1 surface appear serious erosion. The high modulus fiber specimens FRHPC2 being etched in 25% CMA solution for 1522 d, the denudation growth of the unit surface area is weak. And the relative dynamic elastic modulus remained is more than 100%. On the other hand, small amounts of erosion is on the surface. The hybrid fiber specimens FRHPC3 being etched in 25% CMA solution for 1522 d, the denudation of the unit surface area is almost no change . And the relative dynamic elastic modulus is more than 110%. The surface is intacted. Therefore, fiber modulus, the better the higher resistance to surface erosion. In particular, hybrid fiber reinforced concrete resistance to surface erosion effect is very obvious.