Design and Mix Proportioning of Green Concrete Using 100% Fly Ash Based Hydraulic Binder

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Title: Design and Mix Proportioning of Green Concrete Using 100% Fly Ash Based Hydraulic Binder

Author(s): Raj Patel and Fred Kinney

Publication: Special Publication

Volume: 294

Issue:

Appears on pages(s): 1-20

Keywords: eGC, fly ash, Green cement, Green concrete, Mix proportioning, Sustainable concrete.

Date: 10/4/2013

Abstract:
The fly ash based hydraulic binder (FAHB) described in this paper is comprised of ASTM Class C fly ash, ASTM class F fly ash and two proprietary non-caustic liquid activators. FAHB, a zero carbon footprint binder, is successfully used in making Green Concrete (eGC.) The eGC neither needs wet curing like Portland cement Concrete (PCC) nor needs elevated curing temperature like geopolymer cement concrete. The water demand of eGC is much lower than the water demand of PCC. Though, eGC follows Abrahms’ water-to-cement ratio (W/C) law, it has different sets of curves to estimate the W/C from the required 28-day compressive strength of concrete (f’cr). A little different approach is needed for proportioning the eGC using FAHB. This paper presents the model for estimating the water demand of eGC, the approximate relation between the W/C and f’cr and the step- by- step guideline for mix proportioning of eGC using FAHB, a carbon neutral binder system consisting of no Portlannd cement. The mixture proportioning method proposed in this paper will help concrete engineers and ready mixed concrete producers in designing cost effective and durable eGC. This method permits users to design eGC for wide range of workability and compressive strength.