Properties of Low-Heat Generating Concrete Containing Large Volumes of Blast-Furnace Slag and Fly Ash
Properties of Low-Heat Generating Concrete Containing Large Volumes of Blast-Furnace Slag and Fly Ash
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DOI：
10.14359/1974
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发表时间：
1992-05
期刊：
影响因子：
--
通讯作者：
K. Kanazawa;K. Yamada;S. Sogo
中科院分区：
文献类型：
--
作者：
K. Kanazawa;K. Yamada;S. Sogo
明石海峡大桥锚碇采用大体积混凝土，水平尺寸为60 m x 85 m，高度为45 m。对混凝土进行预冷和管道冷却，以防止大体积混凝土的热开裂。对各种低热水泥混凝土的基本性能进行了比较，以选择适合工程的低热水泥。本文介绍了低热型水泥混凝土的强度和绝热温升，以及矿渣和粉煤灰对混凝土性能的影响。虽然低热产生混凝土通常在凝结时间上表现出延迟，并且表现出更多的泌水，但是发现使用非常细磨的高炉矿渣和细磨的石灰石粉改善了混凝土的和易性，减少了泌水，并且对于早期强度的发展是有效的。
The anchorages of Akashi Kaikyo Bridge are of mass concrete, and have horizontal dimensions of 60 m x 85 m, and a height of 45 m. Precooling and pipe cooling of concrete will be done to prevent the thermal cracking of the mass concrete. Comparisons have been made of the basic properties of concrete using a variety of low-heat generating cements so as to select the ones suitable for the project. This paper gives results of the strength and adiabatic temperature rise in concrete using low-heat type cements, and the influences of the slag and fly ash on the properties of concrete. Although the low-heat generating concrete generally shows retardation in the setting time and shows more bleeding, it was found that the use of very finely ground blast-furnace slag and finely ground limestone powder improved workability of concrete, reduced bleeding, and is effective for the developemnt of early-age strength.