01555665

Component

The purpose of the presented research is to investigate the relationship between Visual Stability Index (VSI), flowabilty, and fresh segregation of Self Consolidating Concrete (SCC). The mixtures were developed using two fly ash classes F and C and different aggregate sizes to study the effects of VSI values of 1 and 2 on different mixtures. The mixtures were designed with 20% cement replacement using Class C fly ash for one mixture and Class F for the other. Each mixture was duplicated 12 times with varying visual stability index values of 1 and 2, different coarse aggregate sizes (ASTM C 33 #57,#67, and #7), and with natural and manufactured sand, while maintaining the water/cementitous material ratio at 0.45. The different VSI’s were achieved by varying the dosage of the high water reducing agent (HWRA). The results of this study have indicated that SCC mixes made with the #57 stone, #67 stone, or manufactured sand, with the VSI value of 2, show high segregation potential. Therefore VSI value of 2 is not recommended with these aggregates. The #7 aggregate is highly recommended in order to produce SCC mixtures with high flowability and with less segregation potential. The use of fly ash C and F was noted as being very important in improving the fresh characteristics of SCC mixtures.

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

01550057

15-4451

English

16p

2015

Transportation Research Board 94th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Aggregate segregation; Concrete placing; Fly ash; Mix design; Paving; Self compacting concrete

Flowability; Visual stability index

Construction; Highways; Materials; Pavements; I32: Concrete; I36: Aggregates; I52: Construction of Pavements and Surfacings

Transportation Research Board Annual Meeting 2015 Paper #15-4451

PRP, TRIS, TRB, ATRI

Dec 30 2014 1:28PM