水泥品种对混凝土劣化性能的影响

Influence of difference cement on the deteriorate performance of structural concrete

对纯硅酸盐水泥(S)、普硅水泥(PS)、矿渣水泥(KS)、江南粉煤灰水泥(FS)对混凝土碳化、氯离子侵蚀、干湿循环破坏影响程度进行研究。相同碳化时间内粉煤灰水泥混凝土的碳化深度最大,纯硅酸盐水泥混凝土的碳化深度最小,普硅水泥、矿渣水泥混凝土碳化深度很相近;水泥品种对混凝土抗氯离子渗透性能为矿渣水泥>普硅水泥>粉煤灰水泥>纯硅酸盐水泥;研究了纯硅酸盐水泥(S)、普硅水泥(PS)、矿渣水泥(KS)、粉煤灰水泥(FS)混凝土在淡水中干湿循环损伤(质量损失、相对抗压强度比、相对动弹性模量)规律;综合考虑普硅水泥(PS)混凝土比纯硅酸盐水泥、矿渣水泥、粉煤灰水泥混凝土具有更好耐久性能。

The project studies the influence of pure Portland cement （S）, Portland cement（ PS ）, blast furnace slag cement （KS） and fly ash cement （FS） on the carbonation, chloride corrosions, dry-wet cycles.The experimental results confirmed that pure Portland cement （S） was more resistant to carbonation compared to fly ash cement（FS ）, the Portland cement（ PS ）, blast furnace slag cement （KS） have a near depth of carbonation at the same carbonation time.The concrete of adding difference cement has a difference effect on its resistance to chloride ion penetration, furthermore, the effect of blast furnace slag cement（KS） is best, fly ash cement（FS） second, then follows Portland cement（PS ）, finally pure Portland cement （ S ）.The durability performance of pure Portland cement （ S ）, Portland cement （ PS ）, blast furnace slag cement （ KS ） and fly ash cement （ FS ） concrete were studied experimentally by dry-wet cycle in water.The parameters were the weight lost, the relative compressive strength, the relative dynamic of elasticity, the result indicates that durability performance of Portland cement（ PS ） concrete is superior to pure Portland cement（ S ）, blast furnace slag cement（ KS ） and fly ash cement （FS） concrete.