01592698

Component

This paper is focused on the experimental evaluation of workability and compressive strength of Self-Consolidating Concrete (SCC) made with different aggregate blending for its use in prestressed bridge girders. The ultimate goal of this paper was to determine an optimum aggregate blending of SCC mixtures in terms of workability and strength necessary for the construction of prestressed bridge girders. Although workability and strength can be easily improved by adjustment with admixtures and/or cement content, coarse aggregates considered the most cost effective variable in the mixture were selected to be modified to achieve the optimum mixture for this study. Specifically, 19.0mm (¾”) and 9.5mm (3/8”) selected as the Maximum Size Aggregates (MSA) were used. Blending configurations that were distributed in intervals of 20% by weight were used to establish multiple SCC mixture samples as per cement Type I/II and Type III. Other parameters, including water-cement ratio (w/c), Sand-Aggregate ratio (S/Agg), cement content along with admixture proportioning, were held constant through the entire testing, so as to study the effect of aggregate blending on the SCC workability and strength. The tests with the samples that were conducted for this study were the slump flow, J-Ring, column segregation and compressive strength tests. Key results indicated that the several blending configurations that met both acceptable workability and required compressive strength release at short curing time were found and the optimum SCC mixture for both cement Type I/II and III was the one made with 40% of 9.5mm (3/8”).

This paper was sponsored by TRB committee AFN40 Standing Committee on Concrete Materials and Placement Techniques.

01584066

16-2455

English

16p

2016

Transportation Research Board 95th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Admixtures; Blending; Coarse aggregates; Compressive strength; Girders; Mix design; Prestressed concrete; Self compacting concrete; Workability

Bridges and other structures; Construction; Highways; Materials

Transportation Research Board Annual Meeting 2016 Paper #16-2455

TRIS, TRB, ATRI

Jan 12 2016 5:05PM