Use of slaked lime and Portland cement to improve the resistance of MSWI bottom ash-GBFS geopolymer concrete against carbonation

Huang, Guodong; Ji, Yongsheng; Li, Jun; Hou, Zhihui; Cheng, Jian

doi:10.1016/j.conbuildmat.2018.01.089

Cited by 67 publications

(12 citation statements)

References 33 publications

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“…Table 4 shows worse durability properties towards carbonation for geopolymer concretes than Portland ones. This evidence can be explained by several findings deduced in Portland media: (a) CSH gel has intrinsic resistance to carbonation and the reaction with liquid-phase CO 2 is very slow; (b) the presence of CAH crystals leads to the formation of insoluble CaCO 3 phases which reduces the overall porosity of the material [ 83 ]. In geopolymer materials, the penetration of CO 2 produces Na 2 CO 3 or K 2 CO 3 components that are highly soluble in water and easily dissolvable, increasing the porosity and permeability characteristics [ 91 ].…”

Section: Geopolymer Vs Ordinary Pc Mixes: a Comparative Analysismentioning

confidence: 99%

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

2021

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In the direction of reducing greenhouse emissions and energy consumption related to the activities of the cement and concrete industry, the increasingly popular concept of eco-sustainability is leading to the development and optimization of new technologies and low impact construction materials. In this respect, geopolymers are spreading more and more in the cementitious materials field, exhibiting technological properties that are highly competitive to conventional Portland concrete mixes. In this paper, the mix design, mechanical properties, microstructural features, and mineralogical properties of geopolymer mixes are discussed, investigating the influence of the main synthesis parameters (curing regime, type of precursors, activator molarity, mix design) on the performance of the final product. Moreover, recent developments of geopolymer technology based on the integration of functional nanofillers are reported. The novelty of the manuscript is to provide a detailed collection of past and recent comparative studies between geopolymers and ordinary Portland concrete mixes in terms of strength properties, durability, fire resistance, and environmental impact by LCA analysis, intending to evaluate the advantages and limitations of this technology and direct research towards a targeted optimization of the material.

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Section: Geopolymer Vs Ordinary Pc Mixes: a Comparative Analysismentioning

confidence: 99%

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

2021

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“…The pH environment (pH = 11.55, see Table 2 ) that formed by liquid sodium silicate was too low (pH = 11.55, see Table 2 ) to reach a high alkali potential (pH 14). This high alkali potential in turn is needed to promote the precipitation of active substances from BA and GGBFS and could not promote the fusion of active substances to form C-S-H (which is favorable for the formation when the pH ranges between 13 and 14) and C-A-S-H gels (which is favorable for the formation when the pH exceeds 14) [ 39 ]. Therefore, the formation of C-S-H and C-A-S-H gels was significantly reduced in sample A-5 as a result of the significant deficiency of the precipitation of active substances, which seriously hindered the strength development [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Positive Influence of Liquid Sodium Silicate on the Setting Time, Polymerization, and Strength Development Mechanism of MSWI Bottom Ash Alkali-Activated Mortars

Jin

Huang

et al. 2021

Materials

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Setting time and mechanical properties are key metrics needed to assess the properties of municipal solid waste incineration (MSWI) bottom ash alkali-activated samples. This study investigated the solidification law, polymerization, and strength development mechanism in response to NaOH and liquid sodium silicate addition. Scanning electron microscopy and X-ray diffraction were used to identify the formation rules of polymerization products and the mechanism of the underlying polymerization reaction under different excitation conditions. The results identify a strongly alkaline environment as the key factor for the dissolution of active substances as well as for the formation of polymerization products. The self-condensation reaction of liquid sodium silicate in the supersaturated state (caused by the loss of free water) is the major reason for the rapid coagulation of alkali-activated samples. The combination of both NaOH and liquid sodium silicate achieves the optimal effect, because they play a compatible coupling role.

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“…e chemical reactions including the precipitation of calcium silicoaluminate gel (CASH) and sodium silicoaluminate gel (NASH) may occur during the process of setting and hardening, then forming a three-dimensional aluminum silicate network structure which consists of AlO 4 and SiO 4 tetrahedral structure units, which could be used to seal the contaminants tightly in the cavity [30,31].…”

Section: Alkaline Activated Cementmentioning

confidence: 99%

Review on Cement Stabilization/Solidification of Municipal Solid Waste Incineration Fly Ash

Fan

Wang

Zhang

2018

Advances in Materials Science and Engineering

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Municipal solid waste incineration (MSWI) fly ash must be treated properly prior to being disposed in the security landfill due to its serious pollution toxicity. Nowadays, lots of studies have demonstrated that cement-based stabilization/solidification could reduce the toxicity pollution effectively by encapsulating the heavy metals into cement matrix, which leads to greater capacity and weight. This paper compares and discusses the MSWI fly ash treatment with the mostly used matrix materials such as Portland cement, phosphate cement, aluminate cement, and alkaline activated cement. Moreover, immobilization mechanism introduced by the interaction between the MSWI fly ash and hydrated cement matrix materials, such as the physical cementing effect, adsorption, isomorphous replacement, and complex precipitation, was explored in depth. The paper also pointed out some reasonable development directions for cement-based stabilization/solidification technology to improve the effectiveness and application of cement-based stabilization/solidification technology.

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Use of slaked lime and Portland cement to improve the resistance of MSWI bottom ash-GBFS geopolymer concrete against carbonation

Cited by 67 publications

References 33 publications

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

Positive Influence of Liquid Sodium Silicate on the Setting Time, Polymerization, and Strength Development Mechanism of MSWI Bottom Ash Alkali-Activated Mortars

Review on Cement Stabilization/Solidification of Municipal Solid Waste Incineration Fly Ash

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