Recycled gypsum powder from waste drywalls combined with fly ash for partial cement replacement in concrete

Hansen, Sarah; Sadeghian, Pedram

doi:10.1016/j.jclepro.2020.122785

Cited by 51 publications

(11 citation statements)

References 29 publications

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“…Wastes like fly ash (FA) and desulfurization gypsum (DG) are two main industrial solid wastes in Baotou city in Inner Mongolia, China [10]. Improving the utilization rate of FA and DG is one of the important technical problems to be solved by the industry [11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

2021

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The utilization of solid wastes (SWs) as a potential resource for backfilling is not only conducive to environmental protection but also reduces the surface storage of waste. Two types of SWs, including fly ash (FA) and desulfurized gypsum (DG), were used to prepare cementitious backfilling materials for underground mined-out areas. Ordinary Portland cement (OPC) was used as cement in mine backfill. To better investigate the feasibility of preparing backfill materials, some laboratory tests, such as uniaxial compressive strength (UCS), scanning electron microscopy (SEM), and energy dissipation theory, were conducted to explore both strength and microstructural properties of backfilling. Results have demonstrated that the main components of FA and DG in this study are oxides, with few toxic and heavy metal components. The ideal ratio of OPC:FA:DG is 1:6:2 and the corresponding UCS values are 2.5 and 4.2 MPa when the curing time are 7 days and 14 days, respectively. Moreover, the average UCS value of backfilling samples gradually decreased when the proportion of DG in the mixture increased. The main failure modes of various backfilling materials are tensile and shearing cracks. In addition, the corresponding relations among total input energy, dissipated energy and strain energy, and stress–strain curve were investigated. The spatial distribution of oxygen, aluminum, silicon, calcium, iron and magnesium elements, and hydration product are explored from the microstructure’s perspective. The findings of this study provide both invaluable information and industrial applications for the efficient management of solid waste, based on sustainable development and circular economy.

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Section: Introductionmentioning

confidence: 99%

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

2021

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“…So far, many construction industries are commonly practicing the importance of diverse waste materials that replace cement in concrete production. Several studies have been conducted on the mechanical properties of concrete with the replacement of cement partially by fly ash [9], wood ash [10], blast furnace slag [11], waste paper sludge ash [12], palm oil fuel ash [13], waste glass [14], rice husk ash [15], and others. e replacement of cement by some waste byproduct with a specified proportion will enhance the mechanical properties of concrete [16,17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Concrete Characteristics Strength with Partial Replacement of Cement by Hybrid Coffee Husk and Sugarcane Bagasse Ash

Tarekegn¹,

Getachew

Kenea

2022

Advances in Materials Science and Engineering

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Concrete is the most extensively utilized construction material globally and is increasingly used due to industrialization and urbanization. Currently, most scientists worldwide are concentrating their attention on effective strategies to adopt materials from large amounts of waste resources as a partial substitute for cement in concrete production due to scarcity of resources and continuous environmental pollution. In this study, an experimental investigation was conducted on the properties of concrete made from the partial replacement of cement by hybrid coffee husk ash (CHA) and sugarcane bagasse ash (SCBA). The study considered different percentages (0%, 5%, 10%, and 15%) of hybrid ash to assess the engineering properties of fresh and hardened concrete of C-20/25. A slump and compaction factor test was conducted to study the workability of fresh concrete. The study showed that, as the percentage of replacement increased from 0% to 15%, the workability of the concrete decreased up to 15.15%. In addition, compression, split tensile, and flexural tests were done on the 7th, 14th, and 28th days to investigate the properties of hardened concrete. Based on the test result, 10% of hybrid ash was the maximum percentage of replacement that showed a compressive and tensile strength greater than the target strength. Therefore, the study concludes that up to 10% replacement of cement by hybrid ash may be employed in concrete production, which in turn is used to minimize the cost of construction and environmental pollution by recycling waste coffee husk and sugarcane bagasse.

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“…Gypsum is commonly used in manufacturing cement and drywall, and gypsum waste can be obtained from plasterboard waste and used factory goods. Several studies have looked into the use of this waste, both in terms of improving the quality of flexible pavement, concrete, embankments, and soil improvement [9][10][11]. The gypsum material's cementitious properties were discovered to induce strength development in the primary material [12].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Gypsum Treated Clay as a Road Subgrade Material

Halim¹

2022

GEOMATE

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Due to clay soil's low bearing capacity and shear strength, mechanical and chemical stability are required. The objective of this study was to increase the California bearing ratio (CBR) value of clay as a subgrade material by utilizing gypsum waste and determining the percentage of gypsum waste added to the soil to produce an optimal CBR value. According to the USCS classification, the soil sample used in this study was a CL soil sample (Clay-Low Plasticity). Gypsum waste is used as a stabilizer in varying proportions of 10%, 15%, 20%, and 25%, based on the weight of the soil sample. The untreated soil's maximum dry density (MDD) was 1.53%, and the maximum water content was 23.91%. The addition of 25% gypsum resulted in a maximum dry density of 1.571 g/cm3 and an optimum water content of 18.95%. Furthermore, 25% gypsum-treated soil increased the value of both soaked and unsoaked CBR. The addition of 17% gypsum resulted in the best CBR value. The Unconfined Compression Test results revealed that the highest compressive strength (qu) was obtained at 21 days cured and 17% gypsum, with an MDD value of 1.593 kg/cm 2 .

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Recycled gypsum powder from waste drywalls combined with fly ash for partial cement replacement in concrete

Cited by 51 publications

References 29 publications

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

Experimental Investigation of Concrete Characteristics Strength with Partial Replacement of Cement by Hybrid Coffee Husk and Sugarcane Bagasse Ash

The Effect of Gypsum Treated Clay as a Road Subgrade Material

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