Utilization of sludge from ready-mixed concrete plants as a substitute for limestone fillers

Audo, Mariane; Mahieux, Pierre-Yves; Turcry, Ph

doi:10.1016/j.conbuildmat.2016.02.044

Cited by 48 publications

(24 citation statements)

References 12 publications

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“…When the specimens were cured in air, the replacement of cement was not allowed to exceed 5% for ignorable negative influence. To compare the effect of slurry powders and limestone in mortar, the compressive strength of the mortars was tested at 7 and 28 days . After being cured in water for 7 days, the mortars with slurry powder presented a compressive strength which was 11–28% lower than that of the group with same amount of limestone filler.…”

Section: Utilization Of Slurry Waste Solidsmentioning

confidence: 90%

“…The maximum amount of slurry powders accounting for 10% of cement was determined based on the requirement of workability due to its negative effects. Slurry powders substituted for all limestone fillers and a small fraction of sand for an identical distribution of particle sizes was also investigated in mortar . To achieve the same slump class, the mixtures with slurry powders required twice as much superplasticizer as the reference group at least.…”

Section: Utilization Of Slurry Waste Solidsmentioning

confidence: 99%

“…Slurry powders substituted for all limestone fillers and a small fraction of sand for an identical distribution of particle sizes was also investigated in mortar. 53 To achieve the same slump class, the mixtures with slurry powders required twice as much superplasticizer as the reference group at least. Férriz-Papi 58 further replaced the sand and cement in mortar with 5-25% slurry granules, respectively, and compared the two substitutions.…”

Section: Effects Of Slurry Waste Solids On Workabilitymentioning

confidence: 99%

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Recycling fresh concrete waste: A review

Wang

Zhang

2018

Structural Concrete

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Disposal of fresh concrete waste is a worldwide problem. In recent years, many studies have claimed that fresh concrete waste from a reclaiming system can be efficiently recycled into concrete. This paper gives a comprehensive review of the characteristics and applicability of fresh concrete waste in phase of slurry wastewater, fresh paste, and recycled solids. The effects of fresh concrete waste in the three phases on workability, strength, and durability such as permeability, water absorption, shrinkage, and acid resistance of concrete have also been reviewed in this paper.

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Section: Utilization Of Slurry Waste Solidsmentioning

confidence: 90%

Section: Utilization Of Slurry Waste Solidsmentioning

confidence: 99%

Section: Effects Of Slurry Waste Solids On Workabilitymentioning

confidence: 99%

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Recycling fresh concrete waste: A review

Wang

Zhang

2018

Structural Concrete

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“…Low stability of CSW due to the high content of lime is crucial factor blocking its massive application in concrete industry. Audo, Mahieux, and Turcry (2016) focused their research on the direct utilization of CSW to concrete production. The significant problem of CSW is fluctuating activity, which highly depends on the composition of produced concrete, predominantly on the content of clinker.…”

Section: Introductionmentioning

confidence: 99%

Application of concrete slurry waste in cement screeds

Reiterman

Keppert

2019

Modern Building Materials, Structures and Techniques (MBMST)

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Sedimented concrete slurry waste (CSW), containing cement, mineral additives, fine fillers, admixtures and water, is currently a waste without an additional use and has to be fully landfilled. Current CSW management is very expensive and introduces number of environmental risks due to its high pH, exceeding 11.5. This paper deals with the application of two types of CSW as cement replacement in cement screed. The evaluation was carried out in terms of workability and basic mechanical performance of the obtained composites. The applied cement replacement was up to 10 wt.% due to the negative impact on the rheology of fresh mixtures. Reduced workability consequently caused higher content of air in the fresh mixture. It was reflected by lower values of bulk density in hardened state for both studied CSW. These aspects were the reasons of decreased mechanical performance by approximately 15% per 5 wt.% of replacement. Conducted experimental program declared significant limits of CSW application in cement based composites, however additional processing of CSW could significantly modify its properties.

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“…This remaining concrete is generally discharged into large containers and, after hardening, the concrete can be crushed and used as recycled aggregate for further construction. After emptying the rest of fresh concrete, the agitation truck is washed with large amount of water, 700-1300 litres per truck, and the scattered mass settles in large sedimentation tanks [12,13]. Due to the large amount of suspended substances and high alkaline conditions, untreated sludge water cannot be legally discharged into municipal sewer systems [1].…”

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confidence: 99%

Reuse of Waste Material “Waste Sludge Water” from a Concrete Plant in Cement Composites: A Case Study

et al. 2019

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Featured Application: The results of the research indicate the possible useing of waste sludge water directly in the concrete plant where they are produced. It will reduce waste generation and reduction of payments for their liquidation.Abstract: This paper presents the results of research dealing with the use of recycled waste sludge water from a concrete plant (CP) as partial or complete replacement of mixing water in cement mixtures. The need to recycle waste sludge water generated as a by-product (waste sludge water) during the production of fresh concrete in the concrete plant results from the environmental and economic problems associated with the operation of the concrete plant. Mixing water was replaced with recycled waste sludge water in the amount of 25%, 50%, 75%, and 100%. In order to determine the effect of partial or complete replacement of mixing water with waste sludge water from the concrete plant in the production of cement composites, laboratory tests of waste sludge water were carried out to determine whether the waste sludge water complies with the requirements for mixing water defined in CSN EN 1008. The tests also determined the properties of fresh cement mortar and hardened cement composites. These were tests of the beginning and end of cement mortar setting, and the strength characteristics (flexural strength, compressive strength). The results of these tests show that it is possible to replace the mixing water by waste sludge water from the concrete plant in the amount of up to 25% without significantly affecting the tested properties, in comparison with the formula containing pure mixing water.Appl. Sci. 2019, 9, 4519 2 of 12 water-cement ratio for proper hydration, as shown by the studies [5][6][7][8]. Knowing the interactions of the individual components of cement composites, the desired properties of the resulting composites can be achieved. The knowledge of interactions does not only apply to waste mixing water, but can also be applied to other waste products, as suggested by the studies [9][10][11]. In fact, it is estimated that a truck with the volume of 9 m 3 carries approximately 300 kg of returned concrete a day. This remaining concrete is generally discharged into large containers and, after hardening, the concrete can be crushed and used as recycled aggregate for further construction. After emptying the rest of fresh concrete, the agitation truck is washed with large amount of water, 700-1300 litres per truck, and the scattered mass settles in large sedimentation tanks [12,13]. Due to the large amount of suspended substances and high alkaline conditions, untreated sludge water cannot be legally discharged into municipal sewer systems [1]. Water is an important component of concrete. It participates in the hydration of cement, but also contributes to the workability of fresh concrete. The quality of mixing water is therefore crucial for the properties of fresh concrete, including the strength and durability. Most standards specify that water used as mixing water must be clean ...

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Utilization of sludge from ready-mixed concrete plants as a substitute for limestone fillers

Cited by 48 publications

References 12 publications

Recycling fresh concrete waste: A review

Recycling fresh concrete waste: A review

Application of concrete slurry waste in cement screeds

Reuse of Waste Material “Waste Sludge Water” from a Concrete Plant in Cement Composites: A Case Study

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