The effect of recycled aggregate concrete incorporating waste paper sludge ash as partial replacement of cement

Fauzi, Mohd Azrizal; Sulaiman, Hanizam; Ridzuan, Ahmad Ruslan Mohd; Azmi, Ashraf

doi:10.1063/1.4965063

Cited by 21 publications

(15 citation statements)

References 10 publications

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“…However, for structural concrete PSA was mainly proposed as supplementary cementitious material replacing Portland cement in modest amounts (e.g. Fauzi et al, 2016 ; Fava et al, 2011 ; Kadu and Gajghate, 2016 ; Mavroulidou and Awoliyi, 2018 ; Mavroulidou et al, 2013 ; Rajgor and Pitroda, 2013 ). Its use in AAC formulations for structural concrete is mostly unexplored with very rare exceptions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Alkali-activated slag concrete with paper industry waste

Mavroulidou

Shah

2021

Waste Manag Res

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Pulp and paper manufacturing and recycling industries are a resource-intensive sector, generating 25–40% of the annual municipal solid waste worldwide. Waste includes abundant volumes of paper sludge, as well as the product of its incineration, namely paper sludge ash. These two waste materials are both predominantly landfilled. There is thus a drive for additional valorisation routes for these materials. This short communication focuses on the potential use of paper sludge ash in alkali-activated cement concrete; this type of concrete was estimated to potentially reduce CO2 emissions by up to 5–6 times, while it can also incorporate waste materials or industrial by-products in its composition. The paper presents a laboratory study assessing the feasibility of structural alkali-activated cement concrete with ground granulated blastfurnace slag (a by-product of steel production) and paper sludge ash. Paper sludge ash is used mainly as a source of Ca(OH)2 in the alkaline activator solution, and secondly as an additional source of aluminosilicates. A number of factors potentially affecting the activation process and the resulting concrete quality were investigated, including different dosage of activators, curing conditions and curing time. Mixes with paper sludge ash in the activator system developed high early concrete strengths at ambient temperatures and maintained adequate strengths for structural concrete. Further mix optimisation and mechanical and durability testing, accompanied by material characterisation, are required to establish the advantages of using this waste material in structural alkali-activated cement concrete.

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Section: Introductionmentioning

confidence: 99%

Alkali-activated slag concrete with paper industry waste

Mavroulidou

Shah

2021

Waste Manag Res

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“…Ridzuan et al [ 28 ] investigated the mixing characteristics of RCA and WPSA when used to replace Portland cement and evaluated the strength of CLSM based on the optimal content of WPSA (which yielded the maximum strength). Fauzi et al [ 29 ] and Azmi et al [ 30 ] evaluated the strength of WPSA and RCA mixtures. Bai et al [ 31 ] and Mozaffari et al [ 32 ] evaluated the applicability of WPSA and blast furnace slag through physical and chemical evaluation, using them as mixing materials and comparing the strength of mixes containing them with mixes containing ordinary Portland cement.…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics of Controlled Low-Strength Materials with Waste Paper Sludge Ash (WPSA) for Prevention of Sewage Pipe Damage

Park

Hong²

2020

Materials

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In this study, the effects of the mixing conditions of waste paper sludge ash (WPSA) on the strength and bearing capacity of controlled low-strength material (CLSM) were evaluated, and the optimal mixing conditions were used to evaluate the strength characteristics of CLSM with recyclable WPSA. The strength and bearing capacity of CLSM with WPSA were evaluated using unconfined compressive strength tests and plate bearing tests, respectively. The unconfined compressive strength test results show that the optimal mixing conditions for securing 0.8–1.2 MPa of target strength under 5% of cement content conditions can be obtained when both WPSA and fly ash are used. This is because WPSA and fly ash, which act as binders, have a significant impact on overall strength when the cement content is low. The bearing capacity of weathered soil increased from 550 to 575 kPa over time, and CLSM with WPSA increased significantly, from 560 to 730 kPa. This means that the bearing capacity of CLSM with WPSA was 2.0% higher than that of weathered soil immediately after construction; furthermore, it was 27% higher at 60 days of age. In addition, the allowable bearing capacity of CLSM corresponding to the optimal mixing conditions was evaluated, and it was found that this value increased by 30.4% until 60 days of age. This increase rate was 6.7 times larger than that of weathered soil (4.5%). Therefore, based on the allowable bearing capacity calculation results, CLSM with WPSA was applied as a sewage pipe backfill material. It was found that CLSM with WPSA performed better as backfill and was more stable than soil immediately after construction. The results of this study confirm that CLSM with WPSA can be utilized as sewage pipe backfill material.

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“…This is due to the acceleration of the pozzolanic reaction positively influencing strength development at any age, but the rate of strength to increase it depending on the content of active silica and alumina. Furthermore, the WPSA consists of high carbon content that is shown by an ignition loss (LOI) of 4.5% compared to the cement of 0.64% (Fauzi et al, 2016).…”

Section: Flexural Strengthmentioning

confidence: 99%

Influence of Wastepaper Sludge Ash (WPSA) on Ultimate Flexural and Non-Destructive Test (NDT) Results of Ultra High Performance Concrete

Sukri¹,

Kudus²,

Jamadin³

et al. 2022

JSCET

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Nowadays, cement is widely used in the construction industry for the development of this modern era, which causes bad effects on the environment and human health. Besides, waste products such as wastepaper are the other problems facing the environment and land field disposal. In this research, the use of WPSA is not only used as an alternative way to save the environment but also to improve concrete strength in UHPC. WPSA has been added in the range of 5% to 15% of the total weight of cement in UHPC. The prisms with a size of 100 mm x 100 mm x 500 mm with a different percentage of WPSA were tested for flexural tests and non-destructive tests (NDT), which measure ultrasonic pulse velocity and rebound. These tests were carried out to evaluate the flexural strength and mechanical properties of WPSA based on NDT testing. The results show the addition of 5%, 10%, and 15% of WPSA, which are 1.96 N/mm2, 2.26 N/mm2, and 2.11 N/mm2 respectively, in UHPC, which causes the lower flexural strength result. At the same time, the UPV test result shows the concrete is of doubtful quality for all specimens. The average pulse velocity of control UHPC is 2397.38 m/s, which is the highest. This result was also followed by a rebound number that represents low compressive strength as compared to the result of the compressive test. The highest average compressive strength is 38 MPa, which represents the control UHPC. At 5% WPSA addition, the compressive strength started to decrease. The addition of 10% and 15% of WPSA causes a more significant drop in compressive strength.

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The effect of recycled aggregate concrete incorporating waste paper sludge ash as partial replacement of cement

Cited by 21 publications

References 10 publications

Alkali-activated slag concrete with paper industry waste

Alkali-activated slag concrete with paper industry waste

Strength Characteristics of Controlled Low-Strength Materials with Waste Paper Sludge Ash (WPSA) for Prevention of Sewage Pipe Damage

Influence of Wastepaper Sludge Ash (WPSA) on Ultimate Flexural and Non-Destructive Test (NDT) Results of Ultra High Performance Concrete

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