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首页> 外文期刊>Magazine of Concrete Research >Effect of water-to-cement ratio on sulfo-aluminate type cementitious grouting materials
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Effect of water-to-cement ratio on sulfo-aluminate type cementitious grouting materials

机译：水灰比对磺铝酸盐型水泥灌浆材料的影响

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摘要

Aiming to remedy the deficiency of research related to water-to-cement (w/c) ratio (near 1.0) grouting materials, particularly calcium-sulfo-aluminate (CSA)-type cementitious grouting materials, we discuss the influence of w/c ratio on CSA-type cementitious grouting materials. Various experimental data sets reveal that the cube strength, hydration exothermic rate, total energy released and in situ non-destructive resistivity all decrease with increasing w/c ratio. It is observed that pompom spherulites of ettringite differ from most cementitious materials. A lower solution concentration resulted in thicker ettringite crystal prisms. The results also show that these spherulites form because of excessive dehydrate gypsum, which also causes unexpected X-ray diffraction results in the induction period; the content of ettringite of the 1.0-w/c hardened material was highest, whereas that of the 0.8-w/c material was the lowest, indicating that the contact probability among the Al3+, SO42-, and ye'elimite (C(4)A(3)(S) over bar) crystals that act as nucleation sites becomes low, the ion-dissolution rate of the C(4)A(3)(S) over bar framework and the precipitation rate of ettringite both decrease, the Al-O octahedral nucleation barrier increases and the crystal nucleation critical size increases.
机译：为了弥补与水灰比（w / c）（接近1.0）灌浆材料有关的研究不足，特别是硫酸铝铝酸盐（CSA）型水泥灌浆材料，我们讨论了w / c的影响CSA型水泥灌浆材料的比值。各种实验数据表明，立方体强度，水化放热速率，释放的总能量和原位无损电阻率均随w / c比的增加而降低。观察到钙矾石的绒球晶与大多数胶凝材料不同。较低的溶液浓度导致钙矾石晶体棱镜变厚。结果还表明这些球晶是由于过量的脱水石膏形成的，这也引起了诱导期的意外X射线衍射结果。 1.0w / c硬化材料的钙矾石含量最高，而0.8w / c硬化材料的钙矾石含量最低，表明Al3 +，SO42-和-石之间的接触概率（C（4 ）成核位点的）A（3）（S）晶体变低，棒框架上的C（4）A（3）（S）的离子溶解速率和钙矾石的沉淀速率均降低， Al-O八面体成核壁垒增加，晶体成核临界尺寸增加。

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