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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Pumpability of Blast-Furnace Slag Aggregate Concrete
Author(s): Hideo Kasami, Tadashi Ikeda, Shinichi Numata,
and Hisamitsu Harada
Publication: Special Publication
Appears on pages(s): 1143-1164
Keywords: absorption; aggregates; blast furnace slag; coarse
aggregates; compressive strength; field tests; fine aggregates;
porosity; pumped concrete; ready-mixed concrete; slump tests;
Abstract:Laboratory and field studies were conducted on blast-furnace slag aggregates to establish nationwide material standards and recommended practices. Absorption of air-cooled blast-furnace slag kept in water was 2 to 9 times that of natural gravel, while that under pressure of 2.0 MPa was 1.2 to 4 times that kept in water. Absorption characteristics of air-cooled blast-furnace slag under pressure varied depending on its porosity and pore size distribution. Field studies were conducted on the pumpability of blast-furnace slag aggregate concretes. Air-entrained concretes containing air-cooled and granulated blast-furnace slags, and those containing crushed stone and natural sand were pumped and tested for pumping pressure and properties before and after pump-ing. Concrete with air-cooled blast-furnace slag indicated higher pumping pressure than that with crushed stone due to pressure absorption, while no significant change was found for granulated blast-furnace slag concrete. It is concluded that blast-furnace slag aggregate concrete is pumpable without significant slump-loss when such aggregate does not have excessive absorption, and is properly presoaked in water before the mixing of concrete.
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