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4.2. Compressive strength Figures 2 and 3 shows a summary of the e ect of curing method on the compressive strength with curing age for all the curing methods used. It could be seen that there was a signi cant increase in concrete strength with age depending on the curing method adopted. Compressive strength when arranged in de-

This study presents the results of investigation of the effects of elevated temperatures on the compressive strength of Grade 40 concrete. A total of thirty cube specimens were cast, cured in water at ambient temperature in the laboratory and subjected to various temperature regimes before testing. A concrete mix of 1:1:3 (cement: fine aggregates: coarse aggregates) with water content ratio of ...

Normal strength concrete made with basalt and gravel gave similar compressive strength while the concrete containing limestone attained higher strength. The effects of content and particle size distribution of coarse aggregate on the compressive strength of concrete have been investigated (Meddah, Zitouni, and Belâabes 2010).

Normal reduction in strength of concrete by use of air-entrained admixtures varies from 3 to 7%. This variation of strength shall be considered in the mix design of concrete so that a desired compressive strength is achieved with required amount of admixture and workability.

content also has adverse effect of the strength of concrete due to poor adhesion. Researchers have therefore develop various models for predicting the effect of sand fines and W/C on the strength of concrete. However, there is a gap in literature for the combined effect of sand fines and water/cement ratio's effect on the properties of concrete.

The age of concrete structures have lots to do with its strength and durability properties. Understanding the strength-time relationship of concrete helps The age of concrete structures have lots to do with its strength and durability properties. Understanding the strength-time relationship of concrete structures helps to know the effect of loading at a later age.

Nov 05, 2015· Effect of Steel Fibres on Compressive & Tensile Strength of Concrete using M -Sand as Fine Aggregate - written by Shivang. D. Jayswal, Prof. A. G. Hansora, Prof. A. A. Pandya published on 2015/05/11 download full article with reference data and citations

Mar 01, 2001· The specification for the floor of a maintenance building called for a 6-inch slab thickness and concrete with a design compressive strength of 3000 psi. The actual average cylinder strength for the floor concrete was 3630 psi. Four months after the floor was placed, 10 cores were drilled, measured, and tested in compression.

The effects of hot and dry environments on high-strength concrete with different water/binder ratios (0.30, 0.35, and 0.40), using (30%) fly ash for all mixes, and (0%, 5%, and 10%) silica fume with the binder (450, 480, and 520 kg), respectively, were separately investigated, and the effects of curing under different conditions were evaluated ...

Feb 26, 2015· Factors Affecting Strength Test Results of Concrete Compressive strength is the most important property of concrete. The compressive strength of concrete is determined in the laboratory in controlled conditions. On the basis of this test result we judge the quality of concrete. But sometimes the strength test results vary so widely that it becomes difficult […]

The effects of the addition of different nanosilica dosages (0.5%, 1%, and 1.5% with respect to cement) on compressive strength and durability properties of concrete with water/binder ratios 0.65, 0.55, and 0.5 were investigated. Water sorptivity, apparent chloride diffusion coefficient, electrical resistivity, and carbonation coefficient of concrete were measured.

What is the effect of coarse aggregate size in compressive strength of concrete? When we design mix the concrete, its target strength is much less than the compressive strength of the aggregates used in the formation. It can also be clearly seen in the mix design procedure that greater the maximum size of coarse aggregate used, less is the ...

No systematic study of specimen shape effect on dynamic strength of concrete material can be found in literature yet, although some studies of specimen size effects have been reported, . 1.1. Previous studies on static compressive strength of concrete

The concrete strength development factor ξ cc (t/tu) is defined as the ratio of the mean compressive strength at the loading time to the maximum mean compressive strength obtained in the test. The strategies for targeted regulation and control of ξ cc ( t / tu ) were discussed by establishing an artificial neural networks model for strength ...

May 18, 2018· The strength of the concrete depends upon many factors like individual compressive strength of its constituents (Cement, Sand, aggregate), quality of materials used, air entrainment mix proportions, water-cement ratio, curing methods and temperature effects.

The variations of the compressive strengths of concrete and lateritic concrete mixes with watercement ratios of range 0.55 and 0.80, within 7 to 28 days after casting, were experimentally investigated in this research work. The experiment was carried out at the same ambient temperature and the compressive strengths of both concrete and lateritic concrete mixes were found to increase with age ...

Nov 11, 2014· For m2, compressive strength is increased to 50.15 MPa, it also showed an increase in compressive strength. Compressive strength of m3 is decreased to 49.3 MPa that showed a decrease n compressive strength. So the results of test show that compressive strength does not follow a regular trend from m0 to m3.

the effect of the cover thickness and concrete compressive strength on the tension stiffening effect but not the splitting cracks. As a result of the experimental study, the tension strengthening effect decreases when splitting cracks occur

the effect of the cover thickness and concrete compressive strength on the tension stiffening effect but not the splitting cracks. As a result of the experimental study, the tension strengthening effect decreases when splitting cracks occur

examining the slump in pervious concrete was 0 cm in all mixed variation and the result of maximum compressive strength test of 28 days of 15.66 MPa in the mixture with the value of a/c = 2.0 that had permeability of 0.26 cm/s and porosity of 14.7%.

The Effect of Aggregate Properties on Concrete Concrete is a mixture of cementious material, aggregate, and water. Aggregate is commonly considered inert filler, which accounts for 60 to 80 percent of the volume and 70 to 85 percent of the weight of concrete. ... The compressive aggregate strength is an important factor in the selection of ...

Oct 30, 2019· These effects of confinement on concrete's compressive behaviour have been investigated for decades, indicating that conventional FRPs successfully provide ample increase in compressive strength. However, only few studies have been investigated on effect of natural fibre reinforced polymers on confined compressive strength of concrete.

"Effect Of Salt Water On Compressive Strength Of Concrete"

Through evaluating the compressive strength, it was found that the compressive strength of porous concrete with cementless binder decreased in comparison to the compressive strength of porous concrete with ordinary Portland cement (OPC), but the difference was insignificant, at 0.6–1.4 MPa.

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