Effect of synthesis parameters on the quality of construction and demolition wastes (CDW) geopolymers
TL;DR: In this article, the compressive strength of concrete, bricks and tiles collected from various demolished buildings were mixed with the activating solution (NaOH and Na 2 SiO 3 ), and various synthesis conditions (curing at 60-90°C, 8-14 m NaOH molarity, particle size) were considered.
About: This article is published in Advanced Powder Technology.The article was published on 2015-03-01. It has received 194 citations till now. The article focuses on the topics: Compressive strength & Geopolymer.
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TL;DR: In this paper, the effect of alkali activator concentration and curing conditions on consistency and strength of waste clay brick powder-based geopolymer composites was investigated, and it was determined that the microstructure analysis results were consistent with the compressive strength results.
Abstract: The effect of alkali activator concentration and curing conditions on consistency and strength of waste clay brick powder-based geopolymer composites was investigated. For this purpose, geopolymer mortars with twenty different activator concentrations were produced and those mixtures having optimum alkali activator concentration were subjected to different curing conditions. Test results indicated that the optimum alkali activator concentration corresponded to M s (SiO 2 /Na 2 O) ratio of 1.6 and Na 2 O content of 10% by weight of the binder. A maximum compressive strength of 36.2 MPa was achieved by curing at 90 °C, 40% RH for 5 days. In order to characterise the morphology and the structure of the resultant composites, x-ray powder diffraction analysis, thermogravimetric analysis, fourier transform infrared spectroscopy analysis, scanning electron microscopy analysis and micro computed tomography analysis were performed. It was determined that the microstructure analysis results were consistent with the compressive strength results. Denser structure was observed by microstructure analysis in the mixtures having high compressive strength.
167 citations
TL;DR: In this paper, the pozzolanic activity of CBP and properties of blended cement containing CBP were investigated, and the results showed that with the increase of grinding time, the CBP particles tend to be refined and spherical, which will increase the specific surface area and pozzolane activity of blended CBP.
147 citations
TL;DR: In this article, the alkali activation process potential of the industrial byproduct called waste fired clay bricks (Grog) as well as the effects of the addition of granulated blast-furnace slag (S) on the properties of the final products has been studied.
146 citations
TL;DR: In this article, a review summarizes the usage of brick waste as potential partial cement and aggregate replacement materials whereby the performance in terms of the mechanical strengths and some durability-related properties of the concrete were discussed.
136 citations
TL;DR: A review of recent advances in the production of natural fiber-reinforced geopolymers produced from industrial byproducts and waste materials as promising sustainable construction materials is presented in this article.
132 citations
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TL;DR: In this paper, the mechanism of activation of fly ash with highly alkaline solutions is described, and the product of the reaction is an amorphous aluminosilicate gel having a structure similar to that of zeolitic precursors.
1,779 citations
TL;DR: In this paper, the authors present the work carried out on the chemical reaction, the source materials, and the factor affecting geopolymerization, and demonstrate that certain mix compositions and reaction conditions such as Al2O3/SiO2, alkali concentration, curing temperature with curing time, water/solid ratio and pH significantly influences the formation and properties of a geopolymers.
Abstract: Geopolymerization is a developing field of research for utilizing solid waste and by-products. It provides a mature and cost-effective solution to many problems where hazardous residue has to be treated and stored under critical environmental conditions. Geopolymer involves the silicates and aluminates of by-products to undergo process of geopolymerization. It is environmentally friendly and need moderate energy to produce. This review presents the work carried out on the chemical reaction, the source materials, and the factor affecting geopolymerization. Literature demonstrates that certain mix compositions and reaction conditions such as Al2O3/SiO2, alkali concentration, curing temperature with curing time, water/solid ratio and pH significantly influences the formation and properties of a geopolymer. It is utilized to manufacture precast structures and non-structural elements, concrete pavements, concrete products and immobilization of toxic metal bearing waste that are resistant to heat and aggressive environment. Geopolymers gain 70% of the final strength in first 3–4 h of curing.
1,078 citations
TL;DR: In this paper, the relationship between the mineralogical and microstructural characteristics of activated fly ash mortars and its mechanical properties has been established, and the results of the investigation show that in all cases (whatever the activator used) the main reaction product formed is an alkaline aluminosilicate gel, with low-ordered crystalline structure.
873 citations
TL;DR: In this paper, the relationship between composition and temperature on the final chemical and physical properties of a geopolymer derived from waste materials is investigated and it is shown that the differences in reactivity of source materials, used during the synthesis of waste-based geopolymers, significantly affect the final properties of the material.
781 citations
TL;DR: In this paper, ground fly ash (GFA), with a median particle size of 10.5μm, was used as source material for making geopolymers cured at room temperature, and compressive strength tests and microstructure observations using SEM, EDX, XRD and FTIR were performed.
755 citations