(PDF) Environmental Impact of Concrete
A typical concrete mixture consists of 12% Portland cement, 34% sand, 28% crushed stone, and 6% water by weight [6]. Of this mixture, Portland cement alone makes concrete the contributor of 8% of ...
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Exploring the Destructive Impact of Concrete on the …
It consists of a mixture of aggregate (like sand, gravel, or crushed stone), water, and cement, which acts as a binder to hold the aggregate together. Cement is a key ingredient in concrete. The most common type – which is referred to as 'Ordinary Portland Cement' is made by mixing lime, silica, alumina and other components.
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A step towards sustainable glass fiber reinforced concrete …
The present research aims to find the impact of adding glass fiber into sustainable concrete made with silica fume, as a partial replacement of cement, and …
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Recycled construction and demolition concrete waste as …
Superplasticizer content of 0% and 1.3% was used with variable water content to obtain concrete having a slump value of 10 ± 2 cm. Cement contents were 350, 400 and 450 kg/m 3. Silica fume was added to 10% of cement content for Groups (4 and 7). The absolute volume method was adopted to design the mix proportion of the …
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The physical and chemical impact of manufactured sand as a …
1. Introduction. Ultra-High Performance Concrete (UHPC) is one of the most advanced cement-based construction material. It has outstanding mechanical and durability properties, such as compressive strength [2, 3], malleability [4, 5], impact resistance [6], chloride penetration resistance and freezing-thawing resistance [[7], [8], [9]], which has …
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The effects of limestone aggregate on concrete properties
Some of these benefits include good strength, low possibility of alkali-silica reaction and the decrease in drying shrinkage in concrete. This research discusses the consumption and general characteristics of the limestone aggregate in USA and Japan.
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The Effect of Incorporating Silica Stone Waste on the …
Incorporating various industrial waste materials into concrete has recently gained attention for sustainable construction. This paper, for the first time, studies the effects of silica stone waste (SSW) powder on concrete. The cement of concrete was replaced with 5, 10, 15, and 20% of the SSW powder.
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Solved In mix design, which of the following changes will
In mix design, which of the following changes will lead to a lower slump concrete? (Check all correct answers) Increase w/cm Use crushed stone instead of round natural aggregate Increase water content Add 5% of silica fume
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Impact of crushed limestone dust on concrete's properties
This article examines the effect of total substitution of siliceous sand by crushed limestone sand in mortar and concrete with regard to durability. Crushed limestone …
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Impact of crushed limestone dust on concrete's properties
This paper is an experimental investigation of crushed limestone dust to evaluate its feasibility in concrete mix to partially replace fine aggregate. In the paper …
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Respiratory effects of exposure to low levels of concrete …
The average silica content of the dust was 9%. The average cumulative dust exposure was 7.0 mg/m(3) year and cumulative silica exposure was 0.6 mg/m(3) year. Significant associations between exposure to concrete dust and a small lung function (FEV(1)/FVC ratio, MMEF) loss were found, independent of smoking habits and of a history of allergy.
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Development of sustainable concrete using silica fume and stone …
The concrete has been developed by making use of binary and ternary concrete mixes by the use of silica fume and stone dust. The binary and ternary mixes have been prepared by the inclusion of varying percentages of stone dust and silica fume by partially replacing fine aggregates with stone dust by 10%, 20%, 30% & 40% and …
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The Characterization of Crushed Natural Stone …
materials such as river sand and crushed stone are generally used in concrete as aggregates. The properties of the used ... impact of various aggregate kinds on concrete. Wu et al., (2001) examined the ... total sulfur content, alkali-silica reaction (ASR). According to TS EN (Technical Specification European ...
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Mixture composition design of magnesium oxychloride …
Conventional binding materials, such as silicate cement and lime, present high energy consumption, pollution, and carbon emissions. Therefore, we utilize crushed stone as a stabilization material.
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Silica fume as Partial Replacement of Cement in Concrete
Crushed stone sand, i.e. fine aggregate produced by crushing hard stone. ... for 28 days confirmed that silica fume concrete with developed compressive strength (53.42 MPa) could be prepared by ...
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Utilization of rock dust as cement replacement in cement …
Therefore the reduction of cement content in concrete production is one of the major and urgent ... Rock dust is created, in the production process of crushed-stone aggregates. In the course of mechanical treatment and extraction process of rocks and the follow-up sorting, an appreciable amount of waste material, such as rock dust, is …
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Effects of Partial Replacement of Fine …
The suitability of crushed stone dust waste as fine aggregate for concrete was accessed by comparing its basic properties with that of conventional concrete. Crushed stone dust waste can be …
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Combined Impact of Polypropylene Fibers and Silica …
substances such as slag, crushed stone, and gravel. IS: 383 ... (SiO2) content, silica fume, a highly reactive pozzolanic substance, is used Concrete's durability, constructability, ... that are used in concrete to improve resistance to impact, abrasion, and water penetration, as well as to prevent and control fractures. These fibers increase ...
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Measuring crystalline silica in stone
Measuring the crystalline silica content of your stone is a vital step in understanding the level of risk. Stone Initiatives can facilitate crystalline silica content analysis with one of two main methods: ... autoclaved aerated concrete: 20% to 40%; concrete: less than 30%; brick: 5% to 15%;
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Recycling of crushed stone powder as a partial replacement for silica
Therefore, the property of hardened cement with the recycled crushed stone powder was compared to that of the silica powder with KS L 5105 [16] test method. The application of the crushed stone powder was evaluated when the amount of silica powder was reduced by 50% and replaced with crushed stone powder. The evaluation …
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Alfred University, Silica-X tout environmental impact of novel concrete …
Researchers at Alfred University and Silica-X officials believe the novel concrete will stand up to the rigors of a marine environment better than concrete made from Portland cement and has the potential to replace traditional concrete in the manufacture of sea walls and, eventually, as a primary building material in coastal …
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The Effect of Incorporating Silica Stone Waste on the …
This paper, for the first time, studies the effects of silica stone waste (SSW) powder on concrete. The cement of concrete was replaced with 5, 10, 15, and 20% of the SSW …
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Sustainable precast concrete blocks incorporating recycled concrete …
Sustainable precast concrete blocks incorporating recycled concrete aggregate, stone crusher, and silica dust. Author links open ... Quartz sand can replace up to 60% river sand in concrete without having significant impact of its properties (Soumya et al., 2017). ... Crushed stone waste produced by the stone crushing in the production of ...
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Non-destructive test analysis on concrete with rice husk ash …
CS carries a higher percentage of stone powder, so it does not require any kind of sorting. In this paper, cement (5% − 25%) is replaced with RHA and natural sand (20% − ) is replaced with crushed stone (CS). Surface hardness properties of concrete were studied using rebound hammer test and ultrasonic pulse velocity test …
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Environmental impact of concrete containing high volume …
1. Introduction. Concrete is the most widely used construction material due to its wide range of applications, and the current global concrete consumption has reached approximately 15 billion tonnes (Serres et al., 2016; Valipour et al., 2014).Concrete production has a significant environmental impact due to high energy consumption and …
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Correlation Between Materials Finer Than No. 200 Sieve and …
A total of 100 samples of natural silica sand and 100 samples of crushed sand were collected from the stock-piles of different ready mixed-concrete plants in Riyadh. Also, the effects of silica and crushed sands (using different values of sand equivalent and passing No. 200 sieve) on water demands of mortar were investigated.
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6: Specific Gravity Test on Crushed Stone
Download scientific diagram | 6: Specific Gravity Test on Crushed Stone from publication: Partial Replacement of Coarse Aggregate with Broken Ceramic Tiles in Concrete Production | The study ...
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Sustainable valorisation of sand concrete properties using …
To evaluate the impact of limestone sand incorporation, analysed physical and mechanical characteristics through tests such as density, compressive and flexural …
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Experimental Investigation and Machine Learning Prediction …
The Table 9 presents summary statistics for various features of concrete mixtures, including the amount of cement, sand, fine aggregate (FR), metal, coarse …
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Impact of crushed limestone dust on concrete's properties
Workability is reduced with the increase in content of crushed limestone dust in concrete. Compression strength increases up to 20% incorporation of waste dust in …
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A step towards sustainable glass fiber reinforced concrete …
For the control sample, we went for M20 grade concrete in which there were no CS aggregates, glass fibers, and silica fume. The complete mix design can be seen in Table 6.Crushed stone coarse ...
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Mixing design and microstructure of ultra high strength concrete …
The fly ash, GGBS and silica fume were used as supplement cementitious material in this investigation. The fly ash has a specific surface area of 376 m 2 /kg, and the 0.045 mm screen residue of the fly ash was 4.7%. The GGBS meet the S-5 grade with a specific surface area of 403 m 2 /kg. The silica fume has SiO 2 content of more than …
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Mixture composition design of magnesium oxychloride …
We determined the best approach and dosage for improving the water resistance of MOC-stabilized crushed stone by comparing the effects of four …
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Effects of crushed stone waste as fine aggregate on mortar …
In this study, effects of crushed stone waste from Katunun's quarry as fine aggregate on mortar and concrete properties will be examined. Samples with varying …
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