盐渍地区抗腐蚀混凝土耐久性试验研究

研发了适用于西北盐渍地区特殊地质水文环境的掺有粉煤灰和高效减水剂的耐腐蚀双掺混凝土.在实验室对混凝土的抗腐蚀、抗渗、抗碳化、抗冻融性能进行了试验,并在盐渍地区对混凝土的抗腐蚀和抗渗性能进行了现场试验.通过试验得出了粉煤灰掺量与各混凝土耐久性能指标之间的关系.在混凝土中掺加粉煤灰和减水剂的方法能够改善混凝土抗硫酸盐腐蚀的性能和抗渗性能,但掺加粉煤灰对混凝土的抗碳化性能有不利影响;这种配方也使混凝土的抗冻性能变差.经综合考虑,推荐在盐渍地区使用粉煤灰掺量为40%的双掺混凝土,使各项耐久性指标都较高.

Durability of the Corrosion-Resistant Concrete in Saline Soil Area

A kind of corrosion-resistant concrete in which fly ash and water-reducing agent were both added was developed to adapt to the special geological and hydrographic conditions in Northwest China saline soil area.A lab test was performed to investigate the properties of the concrete,such as corrosion resistance,impermeability,carbonization resistance and freeze-thaw resistance,and a field test was done in the saline soil area for the concrete's impermeability and corrosion resistance.The relationships between the amount of fly ash additive and durability indices of such resistances were found.The results showed that adding fly ash and water-reducing agent in the concrete can improve its performance to resist sulphate corrosion and permeation,but fly ash has adverse effect on carbonization resistance.And the existing two-additive compound formulation lowers the freeze-thaw resistance.By a comprehensive analysis,the compound formulation that the fly ash amount is 40% in both additives is recommended for the concrete to be used in the saline soil area,which is available to provide higher durability indices of all resistances as above.