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首页> 外文会议>International Symposium on Material Science and Engineering >Effect of Type of Cement and Expansive Agent on the Hardening of Steam-Cured Concrete
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Effect of Type of Cement and Expansive Agent on the Hardening of Steam-Cured Concrete

机译：水泥和膨胀剂类型对蒸汽固化混凝土硬化的影响

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Pre-cast concrete products are sometimes manufactured in two cycles daily. It is ensured that they have the required strength at an early stage of demolding by increasing the steam curing temperature to reduce cost or increase productivity. However, the reduction in durability because of cracking due to thermal stress is a topic of concern. On the other hand, it has been known that fine blast-furnace-slag powder and expansive agents show high temperature dependence. Although they are used even in precast concrete products, the effect of steam curing on these materials is not known. Thus, in this study, the expression of compressive strength and expansion that are critical in improving the quality and productivity of precast concrete products was investigated, using high early-strength cement and two types of expansive agents, namely, ettringite-based and lime-based agents. Consequently, the strength expression was accelerated by the addition of expansive agent to ordinary cement and high early-strength cement. The extent of restrained expansion is greater for the lime-based expansive agent than for the ettringite-based expansive agent, and when an expansive agent is added to high early-strength cement, the extent of restrained expansion falls to a level lower than that in the case of ordinary cement.
机译：预制混凝土产品有时在两个周期内每天制造。这确保了他们在通过提高蒸汽养护温度，以降低成本或提高生产率脱模的早期阶段所需要的强度。然而，因为由于热应力开裂的耐久性降低是一个令人关注的话题。在另一方面，它已经知道，精细化高炉矿渣粉和膨胀剂显示出高的温度依赖性。虽然他们甚至在预制混凝土产品中，蒸汽养护对这些材料的影响尚不清楚。因此，在这项研究中，抗压强度和扩张，在提高混凝土预制产品的质量和生产效率是至关重要的表达进行了研究，采用高早强水泥和两种类型的膨胀剂，即，钙矾石型和石灰基于代理。因此，强度表达通过加入膨胀剂对普通水泥和高早强水泥加速。约束膨胀的程度比对于基于钙矾石膨胀剂更大的石灰基膨胀剂，并且当膨胀剂加入到高早强水泥，约束膨胀程度下降到电平比低普通水泥的情况。

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