Effects of pre-wetting aggregate on the properties of mortars made with recycled concrete and lightweight aggregates

Jochem, Lidiane Fernanda; Aponte, Diego; Bizinotto, Marilda Barra

doi:10.1590/s1517-707620190002.0677

Cited by 9 publications

(6 citation statements)

References 20 publications

(43 reference statements)

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“…This behavior is essential for both fresh and hardened states because it can promote reductions in superplasticizer content and its possible effects of delaying the setting time. Increases in mechanical strength can also be achieved due to possible reductions in the water-cement ratio for concretes with similar workability [24]. Other factor resulted due the slag incorporation is impact in the cement consumption.…”

Section: Workability and Physical Propertiesmentioning

confidence: 99%

Blasted copper slag as artificial fines in ecofriendly concrete

Oliveira,

Casagrande,

Marinho

et al. 2022

Matéria (Rio J.)

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The present work assessed the feasibility of applying blasted copper slag (BCS) as addition to cementitious composites. Series with 0-15% of BCS were produced and characterized by compression strength, durability, spread and specific gravity. In fresh state, the workability was enhanced in until 250% when adding the slag. Besides, both mechanical strength and durability indicators of BCSR-added concrete were also improved. Although the greater strength at the ages of 7 and 28 days was achieved for the reference concrete, concretes containing 5% and 7.5% of BCSR also reached the expected resistance of 30 MPa at 28 days. Concretes containing 5% and 10% of the slag were the ones that less absorbed water. The reduction in capillary absorption reached 63% in comparison to the ref concrete for 5% BCSmodified concrete. The incorporation of BCS improved the performance of the reference concrete in terms of both mechanical strength and durability. So, the reuse of the BCS produced after abrasive blasting in concretes was viable and sustainable disposal alternative.

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Section: Workability and Physical Propertiesmentioning

confidence: 99%

Blasted copper slag as artificial fines in ecofriendly concrete

Oliveira,

Casagrande,

Marinho

et al. 2022

Matéria (Rio J.)

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“…With regard to RFA pretreatment, prewetting the aggregate is a process that improves behavior; it is easy to implement, it is cheap, and it is environmentally friendly [ 21 , 22 , 23 ]. Various researchers have proven that the prewetting process of RAs reduces the amount of water needed to create a mortar mixture, improving the workability and compression resistance of concrete [ 22 , 24 , 25 ] and mortar [ 23 , 26 , 27 ] samples. Cuenca-Moyano et al [ 28 ], Cabral et al [ 29 ], Zhao et al [ 30 ], and Etxeberria et al [ 31 ] recommended prewetting the RA to 80% of its entire absorption capacity for best performance.…”

Section: Introductionmentioning

confidence: 99%

Recycled Fine Aggregates from Mortar Debris and Red Clay Brick to Fabricate Masonry Mortars: Mechanical Analysis

et al. 2022

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In this research, the mechanical behavior of masonry mortars made with partial substitution of sand by recycled fine aggregates (RFAs) of mortar (MT) and recycled clay brick (RCB) was compared. Mortar specimens were built in two groups (MT and RCB) considering different replacement proportions by dry weight. To reduce the water absorption of RFAs during mortar making, the prewetting method was utilized. All the mixtures were assembled with a volumetric cement-to-aggregate ratio of 1:4 and a consistency of 175 ± 5 mm. The properties in the fresh and hardening state of mortars were analyzed separately. The experimental results showed that the properties of mortars in a fresh state (bulk density and air content) were affected if RFA was added to the mixture; however, mortars assembled with up to 40% and 50% of MT and RCB, respectively, accomplished a compressive strength value of reference for new mixtures. Both mortar groups showed good results in adhesive strength values, with the RCB mortars standing up as they achieved greater adherence than the control mortar with substitution percentages of up to 30%. Therefore, the reutilization of both RFAs is feasible, notably in rendering and bonding functions.

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“…There are two methods used to reduce the water absorption potential of the RFA: increasing the water required during the mix [ 11 , 12 , 20 ] and pre-wetting the RA before mixing [ 21 , 22 , 23 , 24 , 25 ]. Some researchers [ 26 , 27 ] have used RA pre-wetting without altering the amount of mixing water, obtaining slight improvements in workability and the values of resistance to compression of concrete samples.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Wetting Recycled Mortar Aggregate on the Mechanical Properties of Masonry Mortar

et al. 2021

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In this research we evaluated the use of recycled fine mortar aggregate (RFMA) as a fine aggregate for new masonry mortar creation. The pre-wetting effect on the aggregate before creating the mixture was analyzed as a method to reduce its absorption potential. A control mixture of conventional mortar and two groups of recycled mortars were designed with a partial replacement of natural sand by RFMA (pre-wetted and not pre-wetted) performed in different proportions. The results established that the pre-wetting process allows a reduction in the amount of water required during the creation of new mixtures, regulating the water/cement (W/C) ratio and improving the properties of recycled mortars such as air content, fresh and hardened densities, and compressive and adhesive strength for all substitution levels. Mortar made with a 20% substitution and pre-wetted until it was at 67% of its absorption capacity displayed adhesive values higher than the ones shown by the reference mortar. The pre-wetting process proves to be an easy performance technique; it is inexpensive, environmentally friendly, and the most valuable fact is that specialized equipment is not necessarily needed. This process is the most profitable option for improving RFMA exploitation and reuse.

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Effects of pre-wetting aggregate on the properties of mortars made with recycled concrete and lightweight aggregates

Cited by 9 publications

References 20 publications

Blasted copper slag as artificial fines in ecofriendly concrete

Blasted copper slag as artificial fines in ecofriendly concrete

Recycled Fine Aggregates from Mortar Debris and Red Clay Brick to Fabricate Masonry Mortars: Mechanical Analysis

Effect of Pre-Wetting Recycled Mortar Aggregate on the Mechanical Properties of Masonry Mortar

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