Properties of concrete incorporating locally produced Portland limestone cement

Shaker, F.A.; Rashad, Ahmed; Allam, Mohamed

doi:10.1016/j.asej.2017.04.005

Cited by 19 publications

(15 citation statements)

References 27 publications

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“…Although Ordinary Portland Cement (OPC) can be composed of up to 5% limestone, for structural purposes, Portland Limestone Cement (PLC) contains higher limestone amounts; between 6% and 20% (Shaker et al, 2018). The European standard identifies four types of PLC; namely; CEM II/A-L and II/A-LL containing 6-20% limestone and CEM II/B-L and II/B-LL with 21-35% limestone (BS-EN197-1, 2000).…”

Section: Raw Materials For Tiles Manufacturingmentioning

confidence: 99%

“…Some researchers classify them as an "expansion of the ocean" (Rouse et al, 2020). In recent years, governments around the world have sunk different structures in the ocean using varied materials to create or restore habitats for fishes and other species (Santos et al, 2009), but the main problem with these "accidental" reefs is the fact that they do not merge into the surrounding natural environment, become completely invasive or degrade chemical components that may directly or indirectly affect the species settlements (Rittschof and Costlow, 1989).…”

Section: Introductionmentioning

confidence: 99%

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Effect of 3D printer enabled surface morphology and composition on coral growth in artificial reefs

Matus

Alves

Góis

et al. 2021

RPJ

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Purpose The purpose of this paper is to prove and qualify the influence of textured surface substrates morphology and chemical composition on the growth and propagation of transplanted corals. Use additive manufacturing and silicone moulds for converting three-dimensional samples into limestone mortar with white Portland cement substrates for coral growth. Design/methodology/approach Tiles samples were designed and printed with different geometries and textures inspired by nature marine environment. Commercial coral frag tiles were analysed through scanning electron microscopy (SEM) to identify the main chemical elements. Raw materials and coral species were selected. New base substrates were manufactured and deployed into a closed-circuit aquarium to monitor the coral weekly evolution process and analyse the results obtained. Findings Experimental results provided positive statistical parameters for future implementation tests, concluding that the intensity of textured surface, interfered favourably in the coralline algae biofilm growth. The chemical composition and design of the substrates were determinant factors for successful coral propagation. Recesses and cavities mimic the natural rocks aspect and promoted the presence and interaction of other species that favour the richness of the ecosystem. Originality/value Additive manufacturing provided an innovative method of production for ecology restoration areas, allowing rapid prototyping of substrates with high complexity morphologies, a critical and fundamental attribute to guarantee coral growth and Crustose Coralline Algae. The result of this study showed the feasibility of this approach using three-dimensional printing technologies.

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Section: Raw Materials For Tiles Manufacturingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of 3D printer enabled surface morphology and composition on coral growth in artificial reefs

Matus

Alves

Góis

et al. 2021

RPJ

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“…Replacing 5–10% of cement with limestone provides only a similar or higher compressive strength than without [ 13 ]. The data presented reveal that concrete samples with up to 20% of limestone CEM II (A-L or A-LL) had similar values of compressive strength as CEM I 42.5 of concrete samples [ 14 ]. Studies reveal that, at a given water/cement ratio, concrete samples containing limestone could achieve a higher compressive strength and modulus of elasticity than the control samples made of pure Portland cement (CEM I) [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcium Nitrate on the Properties of Portland–Limestone Cement-Based Concrete Cured at Low Temperature

et al. 2021

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The effect of calcium nitrate (CN) dosages from 0 to 3% (of cement mass) on the properties of fresh cement paste rheology and hardening processes and on the strength of hardened concrete with two types of limestone-blended composite cements (CEM II A-LL 42.5 R and 42.5 N) at different initial (two-day) curing temperatures (−10 °C to +20 °C) is presented. The rheology results showed that a CN dosage up to 1.5% works as a plasticizing admixture, while higher amounts demonstrate the effect of increasing viscosity. At higher CN content, the viscosity growth in normal early strength (N type) cement pastes is much slower than in high early strength (R type) cement pastes. For both cement-type pastes, shortening the initial and final setting times is more effective when using 3% at +5 °C and 0 °C. At these temperatures, the use of 3% CN reduces the initial setting time for high early strength paste by 7.4 and 5.4 times and for normal early strength cement paste by 3.5 and 3.4 times when compared to a CN-free cement paste. The most efficient use of CN is achieved at −5 °C for compressive strength enlargement; a 1% CN dosage ensures the compressive strength of samples at a −5 °C initial curing temperature, with high early strength cement exceeding 3.5 MPa but being less than the required 3.5 MPa in samples with normal early strength cement.

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“…Coarse aggregate of crushed limestone and fine aggregate of natural sand have a noticed effect on concrete strength [3]. Crushed stone of different resources can change in concrete strength and properties.…”

Section: Introductionmentioning

confidence: 99%

“…The use for far travelled materials will push for damaging road systems more rapidly, and will add a new additional cost for construction that will not be affordable by the communes. According to Shaker et al in [3]…”

Section: Introductionmentioning

confidence: 99%

Local Aggregate in Production of Concrete Mix in Jordan

Sarireh¹,

Al-Baijat²

2019

OJCE

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Concrete properties such as unit weight and compressive strength are highly dependable on the properties of aggregate. Current research aims to study the effect of aggregate properties on concrete considering the resource of aggregate. The properties of aggregate and fine sand were studied (specific gravity, density, absorption, and abrasion). Also, the properties of concrete were studied (density, unit weight, and compressive strength). Samples of coarse and medium aggregates, and fine sand were collected from different areas in Jordan (Ajloun,

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Properties of concrete incorporating locally produced Portland limestone cement

Cited by 19 publications

References 27 publications

Effect of 3D printer enabled surface morphology and composition on coral growth in artificial reefs

Effect of 3D printer enabled surface morphology and composition on coral growth in artificial reefs

Effect of Calcium Nitrate on the Properties of Portland–Limestone Cement-Based Concrete Cured at Low Temperature

Local Aggregate in Production of Concrete Mix in Jordan

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