Optimization and mechanical-physical characterization of geopolymers with Construction and Demolition Waste (CDW) aggregates for construction products

Panizza, Matteo; Natali, Marco; Garbin, Enrico; Ducman, Vilma; Tamburini, S.

doi:10.1016/j.conbuildmat.2020.120158

Cited by 34 publications

(16 citation statements)

References 42 publications

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“…The maximum size of CA used was in the range between 12 and 20 mm. As per IS 383 (2016), the grading curves for fine, CA and RCA are shown in Figure 1, the proportion of the CA and RCAs used in this study was 60:40 based on earlier research work (Ben Nakhi and Alhumoud, 2019;Puthussery et al, 2017;Malešev, 2020;Panizza, 2020).…”

Section: Methodsmentioning

confidence: 98%

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Kanagaraj

Kiran

Anand

et al. 2022

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Purpose This study aims to develop geopolymer concrete (GPC) using manufactured sand (M-sand) and recycled concrete aggregate (RCA) under different curing conditions. GPC is a sustainable construction material developed with industrial waste products such as fly ash to eliminate the use of cement in the production of concrete. GPC requires heat curing for the attainment of early age strength. The development of GPC under heat curing conditions is a hard process in practice. To overcome such circumstances, an attempt was made to develop the GPC under different curing conditions with the aid of coarse aggregate (CA) and RCA. The influence of different curing conditions on strength gain and microstructural characteristics of GPC is investigated. Mechanical properties of GPC such as compressive strength, tensile strength, flexural strength and elastic modulus are reported and discussed. Design/methodology/approach This study focuses on the assessment of mechanical and microstructure characterization of eco-efficient GPC developed with natural CA and RCAs. The required optimum quantity of binder, alkali activator, alkaline liquid to binder ratio and aggregates was determined by appropriate trials. Three types of curing methods, namely, ambient, oven and water, were used for the development of GPC mixes. Following the properties of RCA, it is realistic to substitute up to 40% of coarser aggregates as the resulting aggregate mix falls within the requirements of the analyzed mix. Findings Special attention is required for the mix with RCA because the mix’s consistency is affected by the high water absorption of the RCA mix. GPC specimens cured at ambient and water conditions exhibited marginal variation in the compressive strength for both CA and RCA. The compressive strength of GPC mixes prepared with RCA was marginally higher than that of the GPC made with CA under different curing regimes. RCA can be used as a sustainable material in lieu of CA in GPC. Originality/value The main significance of this research work is to develop the optimal mix design with appropriate mix proportion. The present study proposes a satisfactory methodology that enhances the mechanical strength of GPC as the guidelines are not available in the standards to address this problem. Effective use of waste materials such as fly ash and recycled aggregate for the development of GPC is another major research focus in the proposed investigation.

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Section: Methodsmentioning

confidence: 98%

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Kanagaraj

Kiran

Anand

et al. 2022

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“…The average of four values is reported with the related standard deviation error bars of each paste. According to [56], the recorded compressive strengths might be about 19% larger than those obtainable via EN 196-1 [55] specimens. The paste mixing procedure for the calorimetric and strength experiments was similar to the paste mixing for the rheological experiments, mixing larger quantities of materials in a mechanical stirrer with a turbine blade.…”

Section: Methodsmentioning

confidence: 99%

Influence of cellulose nanofibrils on the rheology, microstructure and strength of alkali activated ground granulated blast-furnace slag: a comparison with ordinary Portland cement

et al. 2021

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This paper reports on the effect of cellulose nanofibrils (CNFs) on the fresh-state properties of alkali activated ground granulated blast-furnace slag (GGBS). Surface functionalized (oxidized) CNFs were added to alkali activated GGBS water suspensions (hydraulic pastes). The rheological behaviour of the pastes was compared with OPC and interpreted based on the CNF-mineral surface interaction, and on the CNF-water interaction and swelling. The water dispersion of CNFs with different surface functionalization degrees resulted in gels of different viscosity and yield stress, due to their different hydrophilicity and water adsorption properties. On increasing the CNFs surface oxidation degree, the viscosity of the CNF water dispersion decreases and the CNF water adsorption increases, while the viscosity of fresh pastes increases because of the reduced amount of available mixing water. In the hardened state, the hydraulic pastes show differences in mechanical strength related to the type and the amount of CNF influencing the porosity of the matrix as evidenced by the microstructural investigation performed by X-ray microtomography. The presence of higher amounts of CNFs induces the formation of porous agglomerates that may act as stress concentrators due to the swelling ability of nanofibrils.

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“…Construction waste management is essential in today's building industry. It involves handling, recycling, and disposing of materials left over from construction (Ginga et al, 2020). This process is crucial for environmental and economic reasons.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Waste Management in Construction: A Policy Development Approach for Sustainable Practices

Kayenat

2024

Preprint

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The construction industry is pivotal in advancing infrastructure but also contributes significantly to environmental degradation through waste generation. This research investigates waste management practices in three construction projects in Chittagong, Bangladesh, aiming to develop a feasible waste management policy. Through a rigorous analysis of site-specific data, the study identifies the types and quantities of waste generated and evaluates existing waste management practices. The paper proposes a policy focused on reducing waste through strategic planning, efficient resource utilization, and enhanced recycling efforts. While the study provides a foundational policy framework and contributes to sustainable construction practices, it also acknowledges its limitations due to the sample size and geographical focus. Future research directions include broader application and longitudinal studies to assess the policy's impact, integration of advanced technological tools for waste tracking, and a more in-depth stakeholder analysis to foster inclusive and comprehensive waste management solutions. This work serves as a stepping stone towards more sustainable construction practices, with implications for environmental, economic, and regulatory aspects of construction waste management

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Optimization and mechanical-physical characterization of geopolymers with Construction and Demolition Waste (CDW) aggregates for construction products

Cited by 34 publications

References 42 publications

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Influence of cellulose nanofibrils on the rheology, microstructure and strength of alkali activated ground granulated blast-furnace slag: a comparison with ordinary Portland cement

Optimizing Waste Management in Construction: A Policy Development Approach for Sustainable Practices

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