Effect of Different Mineral Powders on Properties of Fresh and Hardened Self-Consolidating Concrete

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Title: Effect of Different Mineral Powders on Properties of Fresh and Hardened Self-Consolidating Concrete

Author(s): C. Shi

Publication: Special Publication

Volume: 233

Issue:

Appears on pages(s): 65-76

Keywords: flowability; fly ash; ground glass powder; limestone dust;self-consolidating concrete (SCC); shrinkage; slag

Date: 3/9/2006

Abstract:
Chemical admixtures and mineral powders are often used together in self-consolidating concrete (SCC) to achieve required flowability, passing ability and good segregation resistance. In this study, coal fly ash, blast furnace slag, limestone dust and ground glass powder are used as mineral powders. Different amounts of superplasticizer are added to give the same initial flowability. The properties of both fresh and hardened SCCs are measured. All these SCCs exhibit similar flowability changes with time except the SCCs with limestone powder lose their flowability faster than the rest. Although SCCs with fly ash and glass powder show similar flowability with time during initial time period, they have different setting times. Because blast furnace slag is a cementitious material, fly ash and glass powder are pozzolanic materials, and limestone dust is neither a cementitious nor a pozzolanic material, SCCs with slag exhibit the highest and SCCs with limestone dust the lowest strength from one to 28 days. However, the SCCs with limestone dust show the lowest autogenous and drying shrinkage among the four SCCs.