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本文采用矿渣水泥、普硅水泥、粉煤灰和矿粉制备某码头C40大体积海工混凝土。通过改变胶凝材料比例、水胶比来考察其对混凝土性能的影响,借助扫描电子显微镜和压汞仪分别分析了试样微观形貌及孔径分布,得出矿渣水泥和普硅水泥试样相关耐久性的差异,最后通过优选原材料、优化配合比和采用保温保湿养护等措施制得大体积海工混凝土实体模型。研究表明:矿渣水泥试样比普硅水泥试样拥有更突出的抗硫酸盐侵蚀性能,经历干湿循环150次后,矿渣水泥试样抗蚀系数保持在95左右,而普硅水泥试样抗蚀系数约为80;普硅水泥试样抗氯离子渗透性能较好,整体孔径分布趋于细化,有害孔比例较小。所有试样6h总电通量低于1000C,达到Ⅰ类抗渗标准。大体积实体模型未出现明显裂缝,无砂斑、砂线等缺陷,表观质量良好。
This paper uses slag cement, general-purpose cement, fly ash and mineral powder to prepare a terminal C40 large-volume marine concrete. The effects of cementitious material ratio and water-cement ratio on the properties of concrete were investigated. The microstructure and pore size distribution of the samples were analyzed by scanning electron microscopy and mercury porosimetry, respectively. Durability differences, and finally through the selection of raw materials, optimization of mixing ratio and the use of thermal insulation and other measures to ensure that large-scale marine concrete solid model. The results show that slag cement samples have more outstanding sulfate resistance than ordinary silicon cement samples. After 150 cycles of wet and dry cycles, the corrosion resistance of slag cement samples remains about 95% The corrosion coefficient is about 80. The ordinary silicon cement sample has better resistance to chloride ion penetration, the overall pore size distribution tends to be refined and the proportion of harmful pores is smaller. All samples 6h total flux less than 1000C, to Ⅰ impermeable standard. Large-volume solid model does not appear obvious cracks, no sand spot, sand lines and other defects, the apparent good quality.