超速硬ポリマーセメントコンクリートの調合設計法の提案
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概要
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In recent years, ultrarapid-hardening polymer-modified cement concretes have been used for the repair works of concrete structures. The purpose of this study is to establish the mix design method for the ultrarapid-hardening polymer-modified cement concretes, and to examine its applicability in the field. The ultrarapid-hardening polymer-modified cement concretes for the laboratory test were prepared with various polymer-cement ratios, unit cement contents, water-cement ratios, sand-aggregate ratios and retarder-cement ratios, and tested for slump, air content, handling time (which was defined as the elapsed time when the slump decreased to about 2 cm) and compressive strength. The conclusions obtained from the test results are summarized as follows: (1) The slump of the ultrarapid-hardening polymer-modified cement concretes with various mix proportions may generally be expressed by the following equation : Sι=Ae^<-B(Vag+Vc)/Vω> where Sι is the slump of the ultrarapid-hardening polymer-modified cement concretes, V_<ag> V_c and V_ω are the volumes of aggregate, cement and water per unit volume of the ultrarapid-hardening polymer-modified cement concretes respectively, and A and B are empirical constants. (2) The compressive strength and handling time of ultrarapid-hardening polymer-modified cement concretes with various mix proportions may generally be expressed as a function of "void-cement ratio (α)", "retarder-cement ratio (β)" and "polymer-cement ratio (γ)" by the following equations: F=J/(K^α・L^β・M^γ) Ht=S・T^α・U^β・V^γ where F and Ht are the handling time and compressive strength of the ultrarapid-hardening polymer-modified cement cencretes respectively, α is the void-cement ratio [α=(V_ω+V_α)/V_c], β is the retarder-cement ratio (β=V_γ/V_c), γ is the polymer-cement ratio (γ=V_p/V_c), V_α, V_γ and V_p are the volumes of air, retarder and polymer per unit volume of the ultrarapid-hardening polymer-modified cement concrete respectively, and J, K, L, M, S, T, U and V are empirical constants. (3)The mix design system for the ultrarapid-hardening polymer-modified cement concretes is proposed by use of the respective equations for slump, handling time and compressive strength predictions. (4) The applicability of the mix design system for the ultrarapid-hardening polymer-modified cement concretes is confirmed in the field.(
- 社団法人日本材料学会の論文
- 1995-03-15
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