干湿循环作用下灌注性水泥砂浆抗硫酸盐侵蚀研究

为了研究半柔性路面灌注性水泥砂浆的抗硫酸盐侵蚀性能,通过干湿循环方法分别研究了水胶比、砂胶比、粉煤灰掺量、硅灰掺量、减水剂掺量对抗折和抗压抗蚀系数的影响。结果表明:浓度为5%的硫酸钠溶液对抗压强度的影响比抗折强度的大;抗折抗蚀系数在干湿循环40次时最大;抗压抗蚀系数在干湿循环30次时开始小于1,说明抗硫酸盐侵蚀性能开始下降;水泥砂浆抗硫酸盐侵蚀性能较好的配比为:水胶比0.5,砂胶比0.2,粉煤灰掺量20%～25%,硅灰掺量2.0%～2.5%,减水剂掺量0.3%。

Study on resistance to sulfate attack of poured cement mortar under dry and wet cycle

In order to study the resistance to sulfate attack of poured cement mortar for the semi-flexible pavement,the effect of water-binder ratio,sand-binder ratio,fly ash content,silica fume content and superplasticizer dosage on the coefficient of flexural and coefficient of pressure were studied by the wetting-drying test. The results showed that the effect of 5% sodium sulfate solution on compressive strength is greater than that of flexural strength;the coefficient of flexural had a maximum at 40 cycles of wetting and drying cycles;the coefficient of pressure starts to be less than 1 at 30 cycles of wetting and drying cycles,which illustrates the ability to resist sulfate erosion began to decline;The better dosage of cement mortar against sulfate attack is:water-binder ratio 0.5,sand-binder ratio 0.2,fly ash content 20%~25%,silica fume content 2.0%~2.5%,superplasticizer dosage 0.3%.