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The wastewater from ready-mixed concrete plants is currently being recycled as concrete mixing water. It has attracted significant attention from the construction industry and researchers since it promotes sustainable development through environmental protection, energy-saving, and emissions reduction. This article review first introduces …
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The concrete slurry water used in experiments was separated into supernatant water and concrete slurry waste to obtain equal sludge solids content. The concrete slurry waste was dried at 105 °C until it reached a constant weight. Then, the dried concrete slurry waste was pulverized to control the particle size to 75 µm or below …
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The outcomes of the analysis indicate that the partial replacement of sand with dry sludge in the concrete mix is viable and useful. The result showed that up to …
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Various concrete waste types include demolished concrete, concrete sludge, concrete grinding residue (CGR), and waste concrete fine. Appropriate methods to recycle these diverse concrete waste types need to be identified to allow a circular concrete industry economy to be developed ( Adams et al., 2017 ; Esa et al., 2017 ; …
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Waste-concrete recycling processes using wet-based crushing methods inevitably generate a large amount of alkaline concrete sludge, as well as wastewater, which contains abundant Ca ions. The Ca-rich alkaline wastewater must then be neutralized for reuse in the waste-concrete recycling process. In this study, the feasibility of a …
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However, producers of concrete poles and piles indicate that this process is expensive, ... Several concrete sludge recycling methods have been proposed, including reusing sludge as a raw material ...
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In the activated mortars, two fractions of concrete sludge were used, under 75 μm and 200 μm, due to different silicon oxide contents, while one mortar was cured at 40°C to investigate the ...
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The usage of waste paper sludge ash in the concrete mix has represented the better results when the replacement up to 5% of cement is done; beyond that limit, a noteworthy decrease in the mechanical and durability properties has been observed. ... Influence of industrial by-products and waste paper sludge ash on properties of …
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Ready-mixed concrete manufacturing consumes a lot of cement and generates millions of m3 of concrete sludge waste (CSW). It is known that CSW is heterogeneous and has different chemical and ...
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The sludge content in the sand was varied from 2.5, 5, 7.5, 10, to 12.5 %. The outcomes of the analysis indicate that the partial replacement of sand with dry sludge in the concrete mix is viable and useful. The result showed that up to 7.5 % of sand could be replaced with dry sludge in concrete for structural applications.
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Moreover, the disposal of waste concrete from a batching plant has high environmental impact [6,7]. The main sources of concrete sludge waste in concrete batching plants (CBPs) are unloaded-concrete that returns to batching plants [4,8] and ballast that is still adhered to cement mixer truck walls after unloading blended cement …
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Industrial sludge byproducts contain CaO, SiO2, Al2O3, etc. When industrial sludge is used in ready-mixed concrete, the performance of the concrete can be enhanced due to the hydration reaction. In the present study, activated sludge was used to prepare ready-mixed concrete, and its durability performance was evaluated. Once the activated …
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This study investigated the use of concrete sludge, a by-product of the ready-mix concrete industry, in combination with high-calcium fly ash in binary cementless binders. Concrete sludge was used in substitution rates ranging from 0% to 60% in test fly ash-based mortars to determine potential synergy. The mortars …
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2.1 Use of Waste Sludge in Bricks Production. A mixture of sludge with shale and clay is used to make bricks, called bio-brick, by Alleman and Berman [].The solid content of wastewater sludge (15–25% solid content) can be combined with conventional clay and shale to produce bio-brick, it looks like regular brick, and the smell of bio-brick is …
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To prevent drastic climate changes due to global warming, it is necessary to transition to a carbon-neutral society by reducing greenhouse gas emissions in all industrial sectors. This study aimed to develop …
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Stone industry has generated about 200 million tons of marble waste by marble processing industries whether in the form of sludge or solid blocks. The accumulated marble wastes contaminate water and air and have harmful effects on human health, plants, and animals. This study focuses on exploring the uses of powder obtained by drying and …
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This paper examines the mechanical properties and durability of recycled aggregate concrete (RAC) containing coarse recycled concrete aggregate (RCA) and industrial by-products. The by-products, including waste paper sludge ash (PSA), fly ash (FA), silica fume (SF), and metakaolin (MK) of different proportions (5%, 10%, 15%) …
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Abstract. A bench-scale plant for waste concrete sludge recycling was designed, constructed, and operated. Real concrete sludge generated from a pile and pole production plant and groundwater were ...
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The recycled concrete sludge used in the study has been developed by a two-component admixture Re-Con Zero Evo (high water absorbing polymer and aluminum sulphate). The objective was to use Re-Con Zero dry washing technology to produce recycled aggregates from concrete sludge (RCZ) [25] in combination with wet …
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We invite scholars from around the world to submit to this Special Issue of Sustainability. Topics of interest include but are not limited to: (1) Management on the reclamation of construction and demolition waste; (2) Advanced recycling technologies for concrete watste; (3) Suatainable recycled materials including crushed recycled …
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The purpose of this paper is to address the use of sludge from water treatment plant (WTP sludge), in its natural form (wet), in the construction industry, …
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1. Introduction Concrete slurry waste (CSW) is one of the possible types of waste generated in ready-mix and precast concrete plants. CSW is a product of the …
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This study aims to investigate the feasibility of using different waste sludge and coal combustion residuals in eco-concrete block production. The compressive strength of the eco-concrete blocks produced by waterworks sludge, bottom and fly ashes were 36 MPa, which comply with the standard specifications for paving blocks in Hong Kong. The …
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RCA lowers the density of hardened concrete. Metallurgical sludge waste or RCA usage adversely affect the absorbability and permeability of concrete. Concrete …
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Nielsen and Glavind (2007) indicate that almost 3% of the produced concrete becomes waste in Denmark. According to Kou et al. (2012), about 0.3–0.4% of fresh concrete waste can be produced every day from an RMC plant with a daily production of 1000 m 3 of concrete. Tam and Tam (2007) report that nearly 1.5% of the fresh …
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Concrete sludge is one such waste. At the end of the work day, each 9 m3 concrete mixer truck brings back approx. ... [32]; therefore, concrete producers need to take additional measures to tackle ...
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According to statistics, the total fresh concrete waste generated in ready-mixed concrete plants (extra products, transportation, unqualified products) is 165–350 million tons annually . Fresh concrete waste accounts for 1.0–4.0% of produced concrete in Europe [ 7 ], 1.0–2.0% in Japan [ 8 ], and 1.5% in Hong Kong – which means more …
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Concrete slurry waste (CSW) is generated from ready-mixed concrete plants during concrete production and is classified as a corrosive hazardous material. If it is …
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Recycling waste and by-products in concrete is a sustainable answer to the landfill disposal or incineration: from this point of view, plastic, rubber and metal powders represent the most hazardous waste (in terms of composition, environmental impact and amount), that can be embedded in concrete. ... reference concrete; SS: sewage sludge ...
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3.1 Quarry fines. Stone waste can be utilized as substitution of concrete to accomplish extraordinary properties of cement. The utilization of the substitution materials offer cost effective, energy savings, better-quality products, and less perils in the earth [].The GSW (Granite Sawing Waste) is having more than 20% of silica thus it can be …
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