Effects of blending manufactured sand and offshore sand on rheological, mechanical and durability characterization of lime-cement masonry mortar

Arulmoly, Branavan; Konthesingha, Chaminda; Nanayakkara, Sma

doi:10.1080/19648189.2021.1995506

Cited by 8 publications

(10 citation statements)

References 32 publications

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“…Firstly, no significant difference was noticed between the MS concretes and RS concrete at the selected MFA replacement levels. MS has angular shape and rough surface texture particles which are produced due to the planer failure along the mineralogical compositions of parent rocks during the crushing stages at the production 8,9 . The RS particles are round shaped and smooth textured due to the years of attrition as they are naturally available 6,8,9 .…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, Gotmare and Sheth 14 reported that the increment in MFA content advanced the water demand and thus a reduction in strength and an increase in drying shrinkage of concrete. Based on the characterization analysis done by Branavan et al, 9 higher water absorption of MS mortar was noticed than river sand mortar, which was due to the increase in MFA content. Furthermore, the study made by Grassl et al 15 mentions that the average width and length of shrinkage cracks in concrete and mortar was increased with the aggregate diameter.…”

Section: Introductionmentioning

confidence: 92%

“…8,9 The RS particles are round shaped and smooth textured due to the years of attrition as they are naturally available. 6,8,9 These characteristics of RS and MS are contrast which could considerably influence the hardened performance of concrete. Especially, the angular and rough textured particles when they are bound with cement paste create a better interlocking behavior.…”

Section: Compressive Strengthmentioning

confidence: 99%

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Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Arulmoly

Konthesingha

Nanayakkara

2022

Structural Concrete

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Manufactured sand (MS) has been started utilizing as an alternative in constructions due to the escalated demand for river sand (RS). The microfine aggregate (MFA) is a salient constituent in manufactured sand, which is a crushed reactive form of parent rocks having particles less than 0.075 mm. This paper presents the effects of varying microfine aggregate levels on bleeding, plastic shrinkage cracking (PSC) and compressive strength of MS made concrete. Two types of MS were utilized: MS from Hornblende‐Gneiss rock (MH) and MS from Charnockite rock (MC) and the MFA level was ranged from 0% to 12% at 3% increments and the reference concrete was prepared with RS alone. With the MFA levels, the bleeding of MS concretes was reduced where, at 0% MFA level the maximum bleeding rates were observed for MC (1.63 kg/m2) and MH (0.84 kg/m2) concretes. PSC results were analyzed from an image processing technique, which revealed an increasing trend of mean and maximum crack widths, crack length and crack area with the MFA levels. At 0% MFA, the mean crack width of MC (0.19 mm) and MH (0.17 mm) concretes manifested marginally similar to RS concrete (0.17 mm). The decreasing bleeding with the MFA levels can be attributed to the increasing severity to PSC. Moreover, the optimum 28 days compressive strength of MC (57.5 MPa) and MH (56.1 MPa) concretes was achieved at 3% MFA level which are higher than RS concrete (51.5 MPa). Consequently, the MFA level should be limited to 3% for better plastic and hardened performance of MS made concrete.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Compressive Strengthmentioning

confidence: 99%

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Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Arulmoly

Konthesingha

Nanayakkara

2022

Structural Concrete

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“…However, generally improvements in fexural strengths as compared to the control mixes can be due to better bonding achieved by the shape of quarry dust aggregates. Te angular particles help in providing better bonding along the crack path developed during the fexural strength test [15].…”

Section: Flexure Strengthmentioning

confidence: 99%

“…It was found that using the manufactured sand needs more water/cement (w/c) ratio for workability equal to that of natural sand concrete. Tis is due to the angular nature of the manufactured sand particles [15]. Te modulus of rupture and compressive strength of manufactured sand concrete is more than that of natural sand concrete at the same w/c ratio [16].…”

Section: Introductionmentioning

confidence: 99%

Performance of Concrete Developed by Enhanced Gradation of Natural Fine River Sands by Partial Replacement of Waste Quarry Dust

Akmal

Fatima

Khurram

et al. 2023

Advances in Civil Engineering

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As construction activity continues to increase on a daily basis, the demand for fine and coarse aggregates is also rising. However, relying on a few sources would quickly deplete the natural sources of aggregates. In Lahore, Punjab, Pakistan, costly coarse pit sand from northern areas is used for concrete, as the local river sands (Ravi and Chenab) are fine and do not meet ASTM specifications for fine aggregates. To alleviate the pressure on one source, it is necessary to improve the gradation of natural river sand by utilizing quarry dust obtained during the process of crushing rock into crushed stones. This study conducted detailed experimental work to enhance the gradation of natural river sand by adding normalized quarry dust. Concrete mixes with three strengths of 21 MPa, 28 MPa, and 35 MPa were prepared by partially replacing natural river sand with quarry sand. Workability and hardened concrete properties were evaluated for all mixes, and cost analysis was performed for 28 MPa concrete. The results were compared with control concrete made with coarse pit sand. When river sand was enhanced by combining 40% river sand and 60% normalized quarry dust, the resulting sand met ASTM requirements. Furthermore, when some fines were removed from river sand and replaced with 50% normalized quarry dust, the sand also met ASTM grading requirements. The compressive and flexural strengths of concrete made with enhanced sand gradation increased by 10–25% and 9–17%, respectively, for 28 MPa concrete compared to the control concrete. Cost analysis showed that 28 MPa concrete made with enhanced natural river sand gradation was 8.6% more economical than concrete made with coarse pit sand.

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Effects of microfine aggregate in manufactured sand on bleeding and plastic shrinkage cracking of concrete

Arulmoly

Konthesingha

Nanayakkara

2022

Front. Struct. Civ. Eng.

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Effects of blending manufactured sand and offshore sand on rheological, mechanical and durability characterization of lime-cement masonry mortar

Cited by 8 publications

References 32 publications

Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Performance of Concrete Developed by Enhanced Gradation of Natural Fine River Sands by Partial Replacement of Waste Quarry Dust

Effects of microfine aggregate in manufactured sand on bleeding and plastic shrinkage cracking of concrete

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