Seawater-mixed concretes containing natural and sea sand …
Seawater and sea sand concretes (SW-SS) have been undergoing evaluation as viable alternatives in concrete production. •. This review critically evaluates …
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Optimization of the Fine to Coarse Aggregate Ratio for the …
Steel fibers of various shapes and sizes can be produced as ... The results obtained demonstrated that FA/CA ratios can affect the freshness and mechanical properties of concretes with similar paste volumes. 2. ... A fineness modulus of 2.54 was attained by a suitable combination of fine and crushed sand. Open in a separate window.
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Concrete | Definition, Composition, Uses, Types, & Facts
Concrete, in construction, structural material consisting of a hard, chemically inert particulate substance, known as aggregate (usually sand and gravel), that is …
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Concrete | Definition, Composition, Uses, Types,
concrete, in construction, structural material consisting of a hard, chemically inert particulate substance, known as aggregate (usually sand and gravel), that is bonded together by cement and water. Among …
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Utilization of unprocessed steel slag as fine aggregate in …
The concrete strength and steel slag content were considered as the main test parameters in this study. A total of 16 mixture groups were designed, as shown in Table 3, consisting of two kinds of concrete (normal and high strength) and eight replacement percentages of fine aggregate by steel slag (0%, 10%, 20%, 30%, 40%, 60%, 80%, and …
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Sustainable Concretes for the Offshore Wind Turbine …
While the production of equivalent amount of OPC requires 5000 MJ of energy and emits 1 ton of CO 2 into the ... UHPC stands out for its high compressive strengths (±120–200 MPa) similar to the values get for steel. It has a substantial autogenous shrinkage within the ... regardless of the type of sand used. Concretes characterization.
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Durability characteristics of high and ultra-high performance concretes
The amount of silica in SF was 94% with a pozzolanic index of 110 (as per the supplier). FA, sand-1, and sand-2 had silica contents of 56%, 67%, and 75%, respectively. Crystalline silica in sands create a bond between the sand particles and other products in the cementitious matrix during the hydration process.
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All About Concrete – What You Need to Know
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Concrete: A Beginner's Guide | HunkerhunkerCement vs. Concrete: What's the Difference?WebAggregates are granular materials such as sand, gravel, crushed stone, crushed hydraulic-cement concrete, or iron blast-furnace slag. Coarse aggregate is that portion retained on …
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Mechanical and durability performance of sustainable concretes …
Local granite aggregate with a nominal maximum size of 10 mm was used as coarse aggregate in concrete. Due to the global shortage of river sand (Ashish, 2019), crushed granite aggregate with a fineness modulus of 2.72 instead of river sand was used as fine aggregate in concrete. A third-generation polycarboxylate-based superplasticizer …
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(PDF) Effect of fiber section shape and volume fraction on …
This study presents the preparation of steel-fiber reinforced concretes (SFRCs) using straight navicular fibers with annular-sector-shaped sections and corrugated fiber with rectangular-shaped ...
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Utilization of treated saw dust in concrete as partial …
Saw dust passing through 4.75 sieve was treated with water and sodium silicate for 24 h before using in concrete. Natural sand was replaced with 5, 10,15 and 20% water treated saw dust in concrete mixture. The effect of silica fume on properties of concrete containing 5% water treated saw dust was also studied by replacing 4, 8 and …
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Mechanical performance of steel and iron slag concretes: A …
It has been inferred from the literature that the use of SS and IS in concretes resulted in satisfactory performance in compressive strength (CS), split tensile strength …
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Physical Properties and Microstructure of Concrete with …
The reference concrete, i.e., concrete without waste basalt powder, was named C0, and the concretes with different amount of basalt powder replacing 10%, …
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Mechanical performance of steel and iron slag concretes
Sand is a key ingredient in concrete, and type and the volume of sand used in a given concrete mix will affect its final qualities. Concrete's strength is boosted in part …
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Sustainability | Free Full-Text | Use of Iron and Steel Slags in …
In the two last decades, world production of pig iron and steel has undergone a significant increase. In 2018, 1252.87 and 1806.46 million tons of pig iron and steel, respectively, were produced as compared to the 575.78 and 809.94 million tons of 2000. Consequently, the amount of the different types of slags deriving from these production …
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Concrete Calculator
Example calculation Estimate the quantity of cement, sand and stone aggregate required for 1 cubic meter of 1:2:4 concrete mix. Ans. Materials required are 7 nos. of 50 kg bag of …
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Complete re-utilization of waste concretes
Concrete recycling is a well-established industry in many countries, albeit limited to the simple crushing of waste concrete and using only the coarse fraction as aggregate. The fine fractions generally remain undervalued, meaning an obstacle for full re-utilization and commercialisation of waste concrete.
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(PDF) Seawater-mixed concretes containing natural and sea sand …
understanding seawater-mixed and sea sand (SW-SS) concretes (including dredged sand, coral sand, and coral aggregates). Fig. 2 shows an in-depth analysis of raw materials used in various
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Aggregates for Concrete
material such as sand, gravel, crushed stone, blast-furnace slag, and lightweight aggregates that usually occupies approxi-mately 60 to 75% of the volume of concrete. Aggregate properties significantly affect the workability of plastic concrete and also the durability, …
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Utilization of solid waste from tunnel excavation as manufactured sand
According to Chinese standard GB/T 14684-2022 [30], the particle size distribution of manufactured sand can be divided into three different zones based on its cumulative screening residue rate, as shown in Fig. 1 (c) with three distinct colors.In terms of the manufactured sand of different lithology used in this study, the green grading curve in …
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Evaluation of the mechanical properties of sea sand-based …
The amount used is determined by the amount required for the number of specimens needed. ... A series of tests were performed to compare the strength of the geopolymer concretes with sea sand and river sand. Mixtures GS and GR with sea sand and normal sand, respectively, were used. ... the steel was attacked and corroded in …
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(PDF) The use of steel slag in concrete
The concretes were prepared from reference cement CEM I 42,5 N, the mixtures of CEM I 42,5 N and antimicrobial ground granulated blastfurnace slag BIOLANOVA (GGBS) (with amount of GGBS 65 mass ...
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(PDF) Effect of sand content on strength and pore
For this purpose, SHMSHCs utilizing microsilica sand and river sand with a median particle size of 0.18 mm and 1.10 mm, at varying sand-to-MgO weight ratios from 0 to 1.60, were experimentally ...
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Effect of fine aggregate/coarse aggregate ratio on the fresh …
It was found that the increase in the sand-aggregate ratio has a negative effect on the compressive strength, knowing that the sand-aggregate ratios were …
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The Improvement of Durability of Reinforced …
Nevertheless, recent studies have shown that steel bars in CSA reinforced concretes, when put in chloride-free environments, seem to be protected from corrosion, despite that their alkalinity (pH = 11.5–12.0) …
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Novel applications of waste foundry sand in conventional …
It was also observed that increasing the percentage of substitution of the waste in relation to the amount of natural sand, the dry density increased, on average, 23.7% and the saturated density ...
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Carbonation Rate and Reinforcing Steel Corrosion of Concretes …
The corrosion rates of steel embedded in these concretes have been measured by the lineal polarization resistance technique. The results indicate that to use RCA and SCM increase the carbonation ...
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Strength prediction models for steel, synthetic, and hybrid …
Steel and synthetic fibers, namely hooked‐end steel (HF) and polyamide (PA) synthetic fibers of total volume of 0.25, 0.5, and 0.75% were added in single and hybrid forms to concrete mixes.
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Concrete Buying Guide
Example: For a 12-foot-by-12-foot slab, the square footage is 144. The desired depth of the slab is 6 inches, which is 0.5 feet. Multiply 144 by 0.5 to get 72 cubic feet. Divide 72 by 27 to get 2.67 cubic yards. Add an extra 10% to allow for spillage. The total amount of concrete you'll need is 2.94 cubic yards.
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Effect of steel fibers on the durability properties of sand concrete
As a function of time, the water absorption of concretes containing steel fibers evolves slowly in the same way and with the same kinetics, whatever the percentage of steel fibers. This gradual increase of the absorption coefficient is proportional to the dosage of steel fibers incorporated into the sand concrete lightened by treated barley …
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