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This study was undertaken to compare the setting time and compressive strength (CS) of MTA Plus with various additives. Materials and Methodology: MTA Plus powder was mixed with following ...
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Here's an overview of the types; A. Water Reducing Additives. These additives lower the water content, in the mix while maintaining its workability. This …
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Therefore, Artificial Neural Network (ANN), which is a computing system that simulates the human brain processes, can be helpful tool for prediction of the compressive strength of green concrete.
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Increase strength (compressive, tensile or flexural). Increase durability or resistance to severe condition of exposure. Decrease permeability of …
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The compressive strength of the concrete cube test provides an idea about all the characteristics of concrete. By this single test one judge that whether Concreting has been done properly or not. Concrete compressive strength for general construction varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and higher in commercial and industrial ...
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Abstract. The construction industry commonly uses steel-reinforced concrete despite the high levels of pollution in its production process. In this research, it was studied the dossing effect of nopal mucilage and Ixtle fiber as additives for the enhancement of concrete's mechanical properties: compression strength, flexural strength, heat …
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The effect of nine cement additives on the unconfined compressive strength (UCS) of warm and ice-rich frozen soils was analyzed. After 7 days of curing at −1 °C, the UCS at −1 °C, the freezing-point depression and changes in the water content of soil samples were measured to explore the additive effect and mechanism.The optimum …
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A total of 1030 sets of concrete compressive strength tests is collected to train and test the learners, in which the concrete mixture components (e.g., coarse/fine aggregates, cement, water, additive, etc.) and the curing time are set as the input data while the compressive strength value is set as the output data.
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High Performance Concrete Additives. Concrete additives are added to the mixture of water cement and aggregate in small quantities to increase the durability …
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The compressive strength of lightweight concrete increases with bagasse content up to 15% and beyond this there is possibility of drastic reduction in strength and this 15% bagasse ash replacement ...
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The water reducer doesn't evaporate; it helps increase the slump or flow without adding water. It also allows you to maintain the desired strength that you need in the concrete. This admixture will reduce the amount of water used while increasing or maintaining the compressive strength of the concrete mix.
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Fillers can fill pores in concrete due to gaps from aggregates, if the empty space is reduced, the compressive strength value of the concrete will increase because the cavities in the concrete can ...
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They can increase the strength by 20-40% at the age of 28 days at dosages of 1.6-6% with a decrease in water-cement ratio and a decrease of cement amount by 20%. ... Additives highly increase the ...
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The difference is mainly caused by the strength increase caused by the additional hydration of cement matrix products at the temperature range of up to 300 °C. The presented models do not account for this strength increase as it cannot be guaranteed, and thus, the models conservatively assume that the strength increase …
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The compressive strength of the concrete declined from 25.2 to 10.3 MPa, 27.1 to 11.7 MPa, 30.7 to 13.6 MPa, 31.4 to 14.5 MPa, 30.9 to 14.2 MPa, and 28.4 to 13.8 MPa, after the incorporation of 25 ...
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The use of an organic-mineral additive in the mixture was leaded to increase the compressive and flexural strength of concrete at the age of 28 days, respectively, from 8% to 93% and from 6% ...
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It has also been obtained that with increase in fly ash content, there is reduction in compressive strength of concrete. The optimum replacement of cement with fly ash is 30%. View full-text
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Concrete admixtures are liquids or powders which are added to the concrete during mixing in small quantities. The dosage is usually defined based on the cement content …
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Ans: Compressive strength is the applied pressure at which a given concrete sample fails. Whereas, Characteristic compressive strength would be that compressive strength below which not more than 5% of the samples are expected to fail. Thus atlas 95% of the samples have higher compressive strength than the …
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It is found that the increase of the compressive strength with the density is more or less described by a linear trend and is more pronounced when protein ing agents are employed in the mix ...
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Compressive Strength of Concre te at 7, 14 ... relative to limestone cement as an additive at 15% and 20% can be accepted, consequently, 15 percent and 20 percent addition of ground sandcrete ...
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In addition to cement, sand, gravel, and water, the current investigation of the influence of additives on the compressive strength of concrete at 28 days …
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(PC) whereas there is a drop in compressive strength of about 4-70% for concrete with rubber content varying from 5- 50%. [10] In addition, the size of the rubber is another factor that affects the compressive strength of concrete with rubber additive compared to PC which shows an inverse relationship between the two variables. [10].
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Plasticizers and Superplasticizers- These admixtures work to increase the strength of the concrete and help to increase slump. Slump is the consistency of the concrete mix. …
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additives e.g. compression strength, flexural tensile strength, density (as light weight concrete) and their influences on concrete behavior. The additives included in this work are, rubber
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1. Introduction1.1. General. For concrete to be good, it needs to be easy to work with. Different situations call for different levels of workability in concrete [1].High workability is needed for things like deep beams, thin walls of water-holding structures with a high percentage of steel reinforcement, column and beam junctions, tremie concreting, …
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A 30 o F increase in mix temperature can cut setting time in half, increase water requirements, and reduce the 28-day compressive strength as much as 25%. A switch from ASTM C494 Type A to Type D water …
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Their compressive strength, compared to standard-strength concrete, was raised by no less than 60 MPa after the standard 28-day period . The first report …
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Over 32.86% of the data had concrete with a compressive strength between 3.84 and 20 MPa, 42.54% had concrete with a compressive strength between 20 and 40 MPa, 14.9% had concrete with a compressive strength between 40 and 55 MPa, and less than 9.7% had concrete with a compressive strength between 55 and 72.48 …
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The tests considered for study are, slump test and compressive strength test The results show that the increase of superplasticizer dose in concrete leads to gain of good ability in addition to slump.
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