The innovations of this paper lie in three aspects: (1) RF models are trained based on the data of the selected concrete mixture indicators to obtain efficient and accurate concrete durability prediction models (2) A mapping function obtained through RF training is used as the surrogate model for iterative optimization calculations to reduce ...
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Rebound Hammer Test. The Rebound Hammer Test is a non-destructive testing method used to evaluate the surface hardness and compressive strength of concrete by measuring the rebound of a spring-loaded hammer. The test involves striking the surface of the concrete with the rebound hammer and measuring the rebound distance using the graduated …
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In order to investigate the influence of carbonation treatment on the rebound strength measurement curve of machine-made sand concrete, this study conducted research on the carbonation mechanism sand concrete rebound strength measurement curve through rebound and compressive strength tests using carbonation degree and concrete strength …
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The test results show that the sand rate has the greatest degree of influence on slump and slump expansion. The mineral admixture has the greatest effect on the 7-day …
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are obvious differences between machine-made sand and natural river sand. So, there are some problems in the performance of concrete prepared with machine-made sand. At present, the machine-made sand is often mixed with natural river …
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Under the same water-binder ratios investigates full solid waste-based concrete composed of machine-made sand and a mixture of full solid waste-based ... 50080-2016 "Standard for Performance Test Method of Ordinary Concrete Mix" to identify the point at which flow ceases, with the average expansion diameter serving as an indicator of ...
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Due to many different characteristics such as irregular polygon particle with pointed edges, rough surface and larger content of stone powder, machine-made sand has ignorable effects on the properties of concrete. As the basis for the design of concrete structures, the relations among the basic mechanical properties of concrete such as compressive strength, tensile …
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Detailedly, the ordinary concrete is totally destroyed when impact velocity is 10 m/s, but the desert sand concrete still maintains the cone shape at impact velocity of 18 m/s, which indicates ...
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Concrete; 7 Methods for Testing Concrete Strength. There are many different practices aside from cylinder break tests that can be used.
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Ordinary Portland Cement (OPC) concrete is your go-to material for countless construction projects. It's made from cement, water, sand, and gravel, and it stands out for its strength, durability, and versatility. You'll find it in important …
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Although the machine-made sand was widely used for concrete in recent years in China, it was short of studies on the relations among the basic mechanical properties of fly-ash concrete with ...
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Due to many different characteristics such as irregular polygon particle with pointed edges, rough surface and larger content of stone powder, machine-made sand has ignorable effects on the properties of concrete. As the basis for the design of concrete structures, the relations among the basic mechanical properties of concrete such as compressive strength, tensile strength, …
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In order to study the effect of polypropylene fibers on the frost resistance of natural sand and machine-made sand concrete, polypropylene fibers (PPF) of different volumes and lengths were mixed ...
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Understanding concrete slump is vital for anyone involved in the construction industry. Concrete slump reflects the consistency of a concrete mix and influences its workability, impacting the final quality of your build. Our guide delves into measuring slump with the slump test, interpreting its value, and troubleshooting common issues to ensure your …
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The fine aggregate used was machine-made sand from Chongzhou, with an apparent density of 2630 kg/m 3, a bulk density of 1640 kg/m 3, a fineness modulus of 2.9, and a stone powder content of 5.0%. For coarse aggregate, Chongzhou crushed stone with a continuous gradation of 5–25 mm was utilized, with an apparent density of 2660 kg/m 3, a …
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Machine-made sand instead of natural sand has become an inevitable choice for the sustainable development of the concrete industry. Orthogonal experiment and grey correlation analysis were used to ...
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Economic limitations often hinder the extensive use of fiber-reinforced concrete in full-scale structures. Addressing this, the present study explored localized reinforcement at critical interfaces, deploying a novel synchronized casting mold that deviates from segmented casting interface studies. The research prioritized the flexural, compressive, and shear characteristics …
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Three strength grades of concrete C30, C40 and C50, and the contents of stone powder in machine-made sand of 5%, 9% and 13% in mass were considered in the mix proportion of concrete with machine ...
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In this paper, the temperature field during the pouring process of machine-made sand concrete is numerically simulated, and the variation law of the temperature field with …
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Semi-destructive concrete exposure methods were used to determine resistance parameters: the impact echo test to determine internal structure, the Figg test for air permeability, the initial ...
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Concrete Compression Testing Machine. A concrete compression testing machine is an apparatus that applies compressive force to concrete specimens. This force is applied gradually until the specimen fails and the maximum load is recorded. The maximum load is then used to calculate the compressive strength of the concrete. Components
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This article presents 755 groups splitting tensile strength tests data of concrete with manufactured sand (MSC) in different curing age ranged from 1 day to 388 days related to the …
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Machine-made sand self-compacting concrete is a kind of self compacting concrete with machine-made sand as fine aggregate, which could fill formwork only by its own gravity, without concrete vibration. ... This paper discusses the characteristics and construction differences between machine-made sand self-compacting concrete and ordinary ...
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The content of needle flakes in machine-made sand is most sensitive to the crushing index value. The crushing index value of machine-made sand is generally above 30%, or even higher. For mixing ordinary concrete, machine-made sand …
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This paper mainly studies the influence of various performance indexes of machine-made sand on the adaptability of polycarboxylic acid and the work performance of concrete, which …
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powder into machine-made sand concrete to improve the overall performance of concrete. The machine-made sand contains stone powder with a particle size of less than 0.075 mm, which is one of the significant differences between machine-made sand and natural sand[4]. Stone powder is a by-product of machine-made sand. If it is not used, it will cause
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As a replacing product of the natural sand, machine-made sand has been widely used in infrastructure at present. However, there are some different properties between machine-made-sand concrete ...
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For a large construction task requiring lots of concrete, machine mixing is often necessary. However, for a smaller, do-it-yourself project with flexible timeframes, hand mixing might work just fine. Curing Concrete. Curing is an essential step in concrete production. It influences the final strength and durability of the concrete.
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The test objects made were tested for compressive strength. There were 6 test objects made in this study with a size of 15 cm x 30 cm. In detail, 3 test objects were made of pumice sand, while the other 3 test objects were made of ordinary sand. The coarse aggregate for all test objects was crushed stone.
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The modulus of elasticity of the concrete with stone powder was predicted by a three-phase composite model. The results show that with the increase of stone powder content, the slump …
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