01555042

Component

Alkali-activated portland cement-free binders for concrete are a promising sustainable alternative to traditional portland cement based binders and have received much attention in the past decade. Much work has been published regarding the microstructure, reaction kinetics, and strength of alkali activated concrete (AAC), but the industry is reluctant to adopt these new technologies. Prior to practical application in the field, additional research into the engineering properties and long term durability of these binders is necessary. This study seeks to address the former gap; the elastic modulus, Poisson’s ratio, and tensile strength several alkali-activated fly ash and slag concretes were evaluated at both ambient and elevated temperature curing. The effect of binder type, activator type and concentration, and curing condition is discussed. In general, AAC exhibited higher tensile strength and lower Poisson’s ratio than typical of portland cement concrete. Poisson’s ratio was around 0.13 and was unaffected by binder, activator, or curing condition. Tensile strengths were approximately 1/5 of compressive strengths. A linear relationship between compressive strength and elastic modulus was identified, as were multiple-effect models for the compressive strength and elastic modulus of activated slag and fly ash concrete.

This paper was sponsored by TRB committee AFN10 Basic Research and Emerging Technologies Related to Concrete.

01550057

15-4174

English

15p

2015

Transportation Research Board 94th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Alkali aggregate reactions; Compressive strength; Concrete; Durability; Fly ash; Modulus of elasticity; Poisson ratio; Properties of materials; Slag; Tensile strength

Highways; Materials; I32: Concrete; I33: Other Materials used in Pavement Layers

Transportation Research Board Annual Meeting 2015 Paper #15-4174

TRIS, TRB, ATRI

Dec 30 2014 1:22PM