水灰比对高抗硫硅酸盐水泥混凝土抗侵蚀性能的影响

Influence of Water-cement Ratio on Resistance to Erosive Ability of High Sulfur Resistant Cement

对高抗硫硅酸盐水泥配制的不同水灰比的胶砂试件进行硫酸盐侵蚀实验。结果表明,高抗硫水泥混凝土的抗侵蚀能力受水灰比和养护龄期的影响,在较大水灰比或较短养护龄期情况下,难以长期抵抗较高浓度硫酸盐溶液的侵蚀;在硫酸根离子浓度≤10 000mg/L的侵蚀溶液中,降低高抗硫水泥混凝土的水灰比,可增强其抗侵蚀能力,但是,当硫酸根离子浓度≥20 250mg/L时,即使降低水灰比,也难以保证长期抵抗硫酸盐侵蚀的能力;在相同水灰比情况下,养护3d高抗试件的抗蚀能力明显低于养护28d高抗试件。

The objective of this study was designed to conduct a sulfate erosive experiment on mortar specimen with different water-cement ratio prepared with high sulfur resistant cement.The result showed that the resistance to erosive ability of high sulfur resistant portland cement concrete were affected by wa-ter-cement ratio and curing age, which were hard to resist the erosion of higher concentration sulfate solu- tion for a long time under the conditions of higher water-cement ratio and shorter curing age^In the erosive solution of sulfuric acid root ion concentration of less than or equal to 10 000 mg/L,reducing the water-ce-ment ratio of high resistance of sulfur cement concrete sulfate can enhance its ability to resist erosion. How-ever, when the erosive solution of sulfuric acid root ion concentration was more than or equal to 20 250 mg/L, even if cutting down the water-cement ratio can hardly guarantee the long term resistance to sulfate erosive ability; In the case of the same water-cement ratio,the ability of the resistance to erosion of 3 days＇ maintenance of high corrosive resistance of the specimens are significantly lower than that of 28 days＇.