Estimation method for concrete performances based on properties of hydration products

本研究的目的是利用与混凝土材料种类和配合比无关的水化产物的性能来评估混凝土的性能。以不同钙硅摩尔比合成的C-S-H为原料，以高炉渣和飞灰为原料进行了试验研究。研究的具体内容和结果如下：1.研究内容和成果。建立了混合水泥(粉煤灰水泥和矿渣水泥)的水化模型。结果表明：1.水化模型可以预测水泥石中氢氧化钙和C-S-H的含量以及水泥石的钙硅摩尔比。研究了合成的C-S-H的钙硅摩尔比对其密度、比表面积和固氯性能的影响。研究了碳化作用对氯离子固定的影响。从钙硅比的角度解释了C-S-H的离子扩散系数、氯离子结合容量等混凝土性能。因此，可以用C-S-H的化学组成来定性地评价混凝土的耐久性。

The purpose of this study is to estimate the concrete performances using the properties of hydration products independent of the kind of materials and mix proportions of concrete. Synthesized C-S-H with various Ca/Si molar ration and Fly ash and Blast furnace slag were used in the experiments. The details and results of the research are as follows1. A hydration model for blended cement(Fly ash cement and Blast furnace slag cement)was developed. The amount of calcium hydroxide and C-S-H and the Ca/Si molar ratio of hardened cement paste can be predicted by the hydration model.2. Effects of the Ca/Si molar ratio of the synthesized C-S-H on its density, specific surface area and the characteristic of chloride fixation were investigated. The effect of carbonation on chloride fixation was also studied.3. Concrete properties, such as diffusion coefficient of ions, chloride binding capacity, are explained by from the view point of Ca/Si ratio of C-S-H. Therefore, the durability of concrete can be evaluated qualitatively by chemical composition of C-S-H.