Stabilization of Recycled Demolition Aggregates by Geopolymers comprising Calcium Carbide Residue, Fly Ash and Slag precursors

By A. Arulrajah, A. Mohammadinia, I. Phummiphan, Suksun Horpibulsuk, Wisanukorn Samingthong. 2016

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Abstract Calcium Carbide Residue (CCR) is the by-product of acetylene gas production. In this research, the alkali activation of Calcium Carbide Residue (CCR) was studied as an economical and low-carbon precursor for development of geopolymer binder. Recycled Concrete aggregates (RCA) and Crushed Brick (CB) are the two major demolition material sources for the Construction and Demolition (C&D) industry. The cement stabilization of C&D materials has been evaluated in recent years, however due to the large carbon footprint associated with Portland cement, geopolymers which utilize the alkali activation of industrial waste by-products have garnered increasing interest from industry. Evaluation of the geopolymer stabilization of C&D materials with CCR precursor were also compared with traditional Fly Ash (FA) and Slag (S) precursors. In addition, the performance of CCR based geopolymers with supplementary FA and S precursors were also evaluated. The three precursors (CCR, FA, S) were combined with contents of up to 10% for the geopolymer stabilization of the C&D materials. A liquid alkaline activator comprising sodium silicate solution (Na 2 SiO 3 ) and sodium hydroxide (NaOH) was used for the alkali activation of the CCR based geopolymers. The strength and durability of the geopolymer stabilized C&D materials were evaluated to ascertain their application in pavement bases/subbases. The results of Unconfined Compressive Strength (UCS) and Resilient Modulus (M R ) testing of these geopolymer stabilized CB and RCA aggregates indicate that different mixtures of CCR based geopolymers can be used to improve the strength properties of the C&D aggregates for pavement base/subbase applications. CCR + 5% S with the C&D materials resulted in the optimum combination for CCR based geopolymer stabilization of C&D aggregates.

Subfields: Building and Construction, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/63663e0a031779fc7193dd93bde007c6a4176b77

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