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2019-02-05 Extreme weather conditions and changes in humidity rates significantly affect the concrete compressive strength development. Concrete as one of the substantial material used in residential buildings and infrastructures is subjected to a massive strength change under

This can explain its positive effect on the concrete compressive strength since highly efficient plasticizers or superplasticizers reduce the W/C and have a positive influence on the rates of cement hydration, which results in an enhancement of concrete compressive strength. 4.3. Permeability 4.3.1. chloride permeability test. As mentioned in paragraph 3.5.1, the RCPT was used in this ...

2020-06-29 Upon adding construction and demolition waste aggregates, the compressive strength of concrete after 28 days was comparable to that of the control concrete specimen. An enhancement in the value of compressive strength is perceived when FA is

2020-10-01 The compressive strength of concrete depends on the water to cement ratio, degree of compaction, ratio of cement to aggregate, bond between

Analysis of the collected test results suggests that the moisture content in concrete does have a significant effect on the compressive strength of concrete, but has a much lesser effect on the split tensile strength. As the specimen degrees of saturation increased, the compressive strength fell. However, at nearly saturated condition, an increase in compressive strength can be found. The aim ...

Effects of size distribution of both fine and coarse aggregate and maximum coarse aggregate size on concrete compressive strength were analyzed. Other variables like water cement ratio, aggregate...

2019-11-30 Effect on the compressive strength of concrete Fig. 1. shows the variation of 7 days and 28 days compressive strength of concrete for w/b ratios of 0.47, 0.45 and 0.42. The compressive strength of the A1, B1 and C1 samples was observed to be 24.8 MPa, 29.9 MPa and 34.3 MPa, respectively, after the 7 days of curing.

Impurities in sand impact negatively on compressive strength as well as bond strength between steel reinforcement and concrete and may cause buildings failure. BS 882 [ 11 ] specifies the tests for suitable aggregates.

2020-05-15 There is a significant impact of water curing and time of curing in achieving the strength of the concrete. In addition, curing affects the durability of concrete. The effect of moist curing can be expressed as follows. Allowing concrete to dry out immediately achieve only 40% of the strength

2020-06-29 This study aims to investigate the effect of construction waste, WFS along with additives on the stress-strain behavior and development of compressive strength with age. Design/methodology/approach. The various concrete specimen were prepared in mix proportion of 1: 2: 4 (cement (C): sand: coarse aggregate). The water-cement ratio of 0.5 (decreased by 10% for

The compressive strength of the concrete and concrete testing is must known information in structural design. Compressive strength is initially checked by doing mix design to make sure the grade of concrete considered in the structural design is achieved. Concrete cube testing or cylinder testing is done to check the development of the strength of the concrete. In other words, we test the ...

The crushing strength of concrete at temperatures up to 600°C was independent of the water/cement ratio used but was influenced by the aggregate/cement ratio. Concrete specimens loaded to produce normal design compressive stress during the period of heating showed less reduction in strength than specimens without imposed load. There was afurther loss in the compressive strength of the ...

Changes of the compressive strength of concrete after 28 d of carbonation under different CO 2 concentrations are shown in Figure 6. Temperature and relative humidity were set to 20 °C and 70%, respectively. It can be seen from Figure 6 that the compressive strength of concrete decreased with the increase of CO 2 concentration. Under the same ...

Analysis of the collected test results suggests that the moisture content in concrete does have a significant effect on the compressive strength of concrete, but has a much lesser effect on the split tensile strength. As the specimen degrees of saturation increased, the compressive strength fell. However, at nearly saturated condition, an increase in compressive strength can be found. The aim ...

The static and dynamic compressive strength of concrete under 0–4 MPa water pressure was investigated experimentally, and their changing pattern was analyzed. An interpretation of the underlying mechanism of these changes was provided. 2. Materials and Methods 2.1. Experimental Devices. A set of high water pressure device was designed in order to study the effect of water pressure on ...

"Effect Of Salt Water On Compressive Strength Of Concrete"

2017-12-08 “ The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days (fck). The characteristic strength is defined as the strength of the concrete below which not more than 5% of the test results are expected to fall.” Average 28 days compressive strength of at least three 150 mm concrete cubes prepared with

2014-11-11 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. But from the results it is also concluded that compressive strength

This study considered the effect of different methods of curing on density and compressive strength of concrete. Concrete cube specimens of mix 1:2:4 were prepared with water-cement ratio of 0.65. The cubes were cured using six methods (air curing, water-submerged curing, spray curing, polythene curing, moist sand curing and burlap curing) until testing ages of 3, 7, 14, 21 and 28 days when ...

2001-03-01 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 average core length was 5.62 inches, and the average strength ...

2017-12-08 “The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days (fck). The characteristic strength is defined as the strength of the concrete below which not more than 5% of the test results are expected to fall.”

2014-11-11 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. But from the results it is also concluded that compressive strength

Also, the results show that the compressive strength increases with increasing aggregate size up to 12.5 mm, while the concrete produced using 20 mm had greater compressive strength than those produced using 25 mm aggregate. This established the importance of ensuring that the right aggregate size is used in the production of concrete.

Generally, concrete compressive strength decreases with an increasing specimen section size. Meanwhile, a decreasing rate remains almost constant beyond a certain size limit. Cube compressive strength is normally higher than that measured from a cylinder, but the effect of specimen shape on the size effect is somewhat indecisive.

Size effect for concrete with 40% fly ash replacement of cement significantly reduced. The experimental results also show that, strength, elastic modulus and ultimate strain of concrete are all size-dependent. But there are different size effect trends between strength and deformation properties.

2018-05-18 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. Compressive strength gives an idea of the overall strength and above-mentioned factors.

The compressive strength of concrete specimens cured by submersion in water is presented in Figure 3. It could be observed from the figure that an average compressive strength of 16.6, 17.3, 19.0, 20.3 and 23.6 N/mm2were recorded after 3, 7, 14, 21 and 28 days of curing respectively.

This study uses three curing methods to determine their effects on the compressive strength and density of concrete. These methods are immersion of concrete cubes in curing tank (Ponding), covering of cubes with wet rug (Continuous wetting) and the use of polythene sheet (Water-barrier). Laboratory experimental procedures were adopted. A total of sixty (60) cubes were cast with 1:2:4 mix ...

It is proposed to determine and compare compressive strength and tensile strength of the concrete grades M25 M30 having different percentage of steel fibre (0%, 1%, 1.5% 2%). The chemical admixtures is used to increase the workability of concrete. The experimental investigation is carried out on a total no of 96 specimen by conducting compressive strength test and, and split tensile test.

The effect of saturation coupled with loading rate on the tensile strength and the compressive mechanical properties of concrete, namely static and dynamic

Also, the results show that the compressive strength increases with increasing aggregate size up to 12.5 mm, while the concrete produced using 20 mm had greater compressive strength than those produced using 25 mm aggregate. This established the importance of ensuring that the right aggregate size is used in the production of concrete.

The effect of different curing conditions and concretes with supplementary cementing materials was assessed by measuring the compressive strength after 3,7,21, and 28 days and flexural strength after 7 and 28 days, whereas the hardness of the interfacial transition zone (ITZ) was measured by using the Vickers hardness tests [ 17

The effects of steam curing conditions such as the presteaming period and the maximum curing temperature on the compressive strength of fly ash concrete were investigated and compared with those of plain concrete in order to use fly ash for precast concrete products. The replacement ratios of cement by fly ash were 0, 20 and 40 percent. The presteaming period ( 2, 4 and 6 hours ) and

Compressive strength test results The strength of concrete is a direct requisite of all concrete structures that resist applied loads. The researchers found that one of the main effects of high temperatures on concrete structures was the reduction in compressive strength of concrete.

Abstract: The effect of low temperature (-35°C) on the mechanical properties of concrete with different strength grade such as compressive strength, flexural strength, splitting tensile strength and elastic modulus was studied. The results showed that all of the mechanical properties were improved at -35°C.

Concrete coring is used for determining compressive strength of hardened concrete of elements to evaluate low-strength-test-result concrete or to understand concrete placing quality of existing structure.

The cubes cured by immersion have an average compressive strength of 29.7 N/mm2while the ones cured by wet rug and polythene sheet have average compressive strength of 26.8 and 24.7 N/mm2respectively. The traditional curing by immersion appeared to be the best method to achieve desired concrete strength.

2015-05-25 Abrams's law of compressive strength versus water/cement ratio is well known and many investigators have studied the possible effects of other factors, such as cement content and sand concentration, upon concrete strength.

The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested after 28 days (fck). In field, compressive strength tests are also conducted at interim duration i.e. after 7 days to verify the anticipated compressive strength expected after 28 days.

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