Fresh and hardened properties of self-compacting concrete modified with lightweight and recycled aggregates

Angelin, Andressa Fernanda; Lintz, Rosa Cristina Cecche; Barbosa, Luísa Andréia Gachet

doi:10.1590/s1983-41952018000100005

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…The SCC/10SF/30MGR/2.5R mixture has shown a 14.5% reduction in the compressive strength when compared with the SCC/10SF sample. The decrease in compressive strength with the increase of rubber content is also previously reported [16,37,39,[64][65][66]. This occurrence is attributed to two main reasons: (a) firstly, the cracks are rapidly initiated at neighboring the rubber particles and concrete paste, and (b) the rubber particles are weakly adhered to the paste, behaving like voids in the concrete matrix [16,64].…”

Section: Hardened State Propertiessupporting

confidence: 77%

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Hooked-End Steel Fibers Affecting Damping Ratio of Modified Self-Compacting Concrete with Rubber and Marble/Granite Additions

Gomes,

Gachet,

Lintz

et al. 2024

Preprint

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The aim of this investigation is focused on the effects of hooked-end steel fibers on both fresh and hardened properties of modified self-compacting concretes (SCC). For this purpose, the steel fibers are associated with other residues contents (i.e. marble, granite and rubber). This concatenated materials contents constitutes a novelty since no investigations are reported. It is found that the increase of rubber content, a better ability to absorb energy is observed. This indicates that a good alternative of structural material is provided. Fresh properties are evaluated by using flow, T500 time, V-funnel, J-ring methods. The mechanical behavior is evaluated in terms of compressive strength, tensile strength, static and dynamic modulus of elasticity, and damping ratio. Experimental results of the water absorption, porosity and density are also attained. It is also found that a SCC mixture containing steel fiber, marble/granite residue and rubber content is a potential mixture to be considered when in SCC designing associated with improved damping ratio. Although the rubber content decreases the mechanical behavior and slump flow, the concatenated utilization of MGR and steel fiber contents provide a slight improve in the damping result. An environmental benefit can also be associated since the cement consumption is decreased with marble additions.

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Section: Hardened State Propertiessupporting

confidence: 77%

“…Similarly when the SCC/20SF/30MGR/5R and the SCC/20SF samples are also compared. In previous studies this behavior is also reported [16,23,[64][65]. From this point, it is important to remark the decision to rubber content be adopted in the proposed mixture examined in the present investigation.…”

Section: Hardened State Propertiessupporting

confidence: 77%

Hooked-End Steel Fibers Affecting Damping Ratio of Modified Self-Compacting Concrete with Rubber and Marble/Granite Additions

Gomes,

Gachet,

Lintz

et al. 2024

Preprint

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“…By the chemical characterization it was observed the presence of 76.34% of SiO 2 and 12.49% of CaO in the ornamental rock waste, close to those found in the literature [16,[44][45][46], while lime is mostly composed of CaO, around 93.43%. In the mineralogical analysis of ornamental rock waste, the predominant minerals were quartz and dolomite, showing good correlation between the chemical analysis performed and studies previously carried out on these materials [8,12,18,20,24,45]. Lime is predominantly composed of portlandite and calcite [46].…”

Section: Chemical and Microstructural Characterizationmentioning

confidence: 60%

“…The rock beneficiation process is divided into two stages: the blocks extraction and their beneficiation. According to Angelin et al [12], in this last stage, the waste generation can reach 20 to 30% of the block volume. Furthermore, during the extraction of marble and granite, the loss can reach 60%, and this activity produces a fine dust that can cause health problems and damage the soil [10,11,13].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Analysis of Mortar Development with Ornamental Rock Waste for Coating Application by Mechanized Projection

Paes¹,

Alexandre²,

Xavier³

et al. 2022

Sustainability

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The industrial production of lime generates greenhouse gases, which contributes to increase the global warming. Therefore, the present study evaluated the feasibility of replacing lime by ornamental rock waste (ORW) as a by-product of the related stone industry, and developed a cost-effective mortars. These new low-costing mortars are intended as fresh fluid paste coatings to be applied on walls by the mechanized projection technique. The ornamental rock waste was collected from a marble and granite industry as ground stone. It was finely crushed before mixing with cement, sand, water and superplasticizer in amounts of 1.0% (R01), 1.2% (R02) and 1.3% (R03), to prepare the mortars, which had the mixture, cement: ORW: sand, 1:1:4 in wt.%. These novel mortars were characterized in both fresh, for well projection, and hardened state, to evaluate the properties after curing performance. The results showed that mortar R03, achieved the best results and did not present cracks in the hardened state. Its water retention was found above 30%. Both tensile strength of 0.312 MPa and compressive strength 7.88 MPa, which are above the corresponding minimum required by the standard for external coating. Water absorption by immersion of 19.37% and void content of 20.23% were close to the corresponding values for hydrated lime mortar. Dry shrinkage showed that the new R03 mortar reached more than 90% of their total retraction at 7 days of cure without sign of cracking. These findings revealed the R03/ornamental rock waste -based mortar applied by mechanized projection as a promising sustainable substitute for common lime-based mortar.

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“…The rubber residue from waste tires has important physical and mechanical characteristics, which make it strongly recommended to be used in civil construction in concrete [14][15][16][17][18] and mortar [19][20][21][22] . Seeking to mitigate the harmful effects of its disposal on the environment 23 .…”

Section: Literature Reviewmentioning

confidence: 99%

Thermal and Acoustic Properties of Rubberized Mortars for Coatings

Oliveira,

Silva,

Angelin

et al. 2023

Mat. Res.

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Recycled crumb rubber can be sustainable used in mortar both to mitigate nature aggregate consumption, reducing environmental pollution, as well, to improve the acoustic and thermal performance of buildings, without damaging its mechanical properties. This paper explores workability, microstructure, mechanical, thermal and acoustic properties considering increasing contents of crumb rubber (0%, 5%, 10%, 15% and 20% replacement, by volume, of fine aggregate). Mortar characterization tests were carried out in the fresh and hardened state. It has been found that replacing the aggregate with scrap tyre rubber reduced the compressive strength on average 12% and 67% and for tensile strength 35% and 53%, for the contents of 10% and 20% respectively, compared to the reference. Furthermore, it was found that the reductions in thermal conductivity reached 16% and 29% and an increase in acoustic attenuation on average 12% and 13%. Moreover, scanning electron microscopy images were analyzed, justifying the mechanical results obtained. Although the experimental results indicated that the workability and mechanical strengths decreased with the increase of rubber replacement rate, the studied mixtures met the standard specifications, and thus suitable for walls and ceilings coating applications, improve the acoustic and thermal performance of buildings and as a sustainable material.

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Fresh and hardened properties of self-compacting concrete modified with lightweight and recycled aggregates

Cited by 10 publications

References 16 publications

Hooked-End Steel Fibers Affecting Damping Ratio of Modified Self-Compacting Concrete with Rubber and Marble/Granite Additions

Hooked-End Steel Fibers Affecting Damping Ratio of Modified Self-Compacting Concrete with Rubber and Marble/Granite Additions

Feasibility Analysis of Mortar Development with Ornamental Rock Waste for Coating Application by Mechanized Projection

Thermal and Acoustic Properties of Rubberized Mortars for Coatings

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