Feb 05, 2019· Concrete strength is fairly sensitive to environmental effects. 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 extreme weather conditions.

Abstract- The paper deals with the effects of addition of various proportions of polypropylene fiber on the properties of high strength concrete m20 mixes.An experimental program was carried out to explore its effects on compressive strength under different curing condition. the main aim of the investigation program is to study the effect of ...

so-called size and shape effect of concrete specimens on the compressive strength test results. According to ( Bažant and Planas (1998) ) , siz e effect can be seen when by

False strength of concrete proves fatal as it may fail due to various factors in the long terms. Therefore, to ensure the functional performance and safety of structure it is necessary to determine the true strength of concrete. In this project the effect of high rate of loading on compressive strength of concrete has been studied. As it has

The authors experimentally studied the size effect of axial compressive properties of concrete cube and slenderness ratio of 2:1 prism with cross-section side length of 100mm to 800mm in this paper. Commercial concrete was used for test specimens. Specimens were cast and cured outdoors. To highlight the size factors, accumulation of sand on the end surface of the specimen was used to …

In all curing methods, the compressive strength of the concrete increases with age. The highest compressive strength at all ages was produced by immersion (water) curing. The average compressive strength of water cured concrete was 13.56w/mm 2 …

Feb 23, 2012· In order to determine the effects of coarse aggregate size on the flexural strength of concrete, concrete beams were produced in accordance with BS 1881-108 (1983) and American Society for Testing ...

Effect of Water-Cement Ratio on Strength. The compressive strength of concrete is a major characteristic of the concrete mix. Change in the amount of water changes the strength of concrete. If water is used in more quantity, it may develop more voids and develop honey-combed structure to a large extent in set concrete. It results in decrease in ...

In order to investigate the effect of fiber on compressive strength, a total of twelve standard concrete cubes, 150x150x150 mm, divided into four groups with four fiber percentages 0.5, 1.0, 1.5 and 2.0% are prepared and tested according to standard method specified by ASTM specification (ASTM C39/C39M-03, 2003).The fibers were in 10 mm sieve put and added gradually (spread) to concrete while ...

Ultimate Tensile Strength

The different effects on concrete strength with age are explained in this section. Variation of Concrete Strength with Time. As per studies and researches, the compressive strength of the concrete will increase with age. Most researches were conducted to study the 28th-day strength of concrete.

Feb 05, 2019· Concrete strength is fairly sensitive to environmental effects. 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 extreme weather conditions.

Abstract- The paper deals with the effects of addition of various proportions of polypropylene fiber on the properties of high strength concrete m20 mixes.An experimental program was carried out to explore its effects on compressive strength under different curing condition. the main aim of the investigation program is to study the effect of ...

Feb 26, 2016· Strength of hardened concrete measured by the compression test. The compression strength of concrete is a measure of the concrete's ability to resist loads which tend to compress it. The compressive strength is measured by crushing cylindrical concrete specimens in compression testing machine. The compressive strength of concrete is calculated by the failure load

In all curing methods, the compressive strength of the concrete increases with age. The highest compressive strength at all ages was produced by immersion (water) curing. The average compressive strength of water cured concrete was 13.56w/mm 2 …

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.

Mar 16, 2012· Using higher number of fines modulus without decreasing amount of mixing water, decrease the compressive strength of concrete. Shape And Size Effect On Concrete Strength. Aggregates shape and size has a strong influence on properties of concrete. Rough surface textured particles increase the compressive strength of concrete up to 20-30% ...

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 ...

Concrete structures deflect, crack, and loose stiffness when subjected to external load. Loss of flexural strength of concrete is largely responsible for cracks in structure. In reinforced concrete structures, the mix proportions of the materials of the concrete and aggregate type determine the compressive strength while the composite action of concrete and steel reinforcement supplies the ...

Effect of curing duration on compressive strength development is presented in Figure 1. Figure 1. Moist Curing Time and Compressive Strength Gain. Higher curing temperatures promote an early strength gain in concrete but may decrease its 28-day strength. Effect of curing temperature on compressive strength development is presented in Figure 2 ...

Compressive strength of concrete is inversely proportional to workability of concrete. When workability of concrete increases, its compressive strength decreases. Therefore, concrete workability cannot be increased to improve concrete placement and compaction since it declines concrete strength.

@inproceedings{Kim2004SIZEEO, title={SIZE EFFECT ON COMPRESSIVE STRENGTH OF CONCRETE}, author={J. Kim and S. T. Yi}, year={2004} } J. Kim, S. T. Yi Published 2004 It is important to consider an effect of a member size when estimating the ultimate strength of a concrete member loaded for all types of ...

Dec 01, 2003· That tensile strength is the basis for its ability to resist bending, or its flexural strength. ACI 207R, Effect of Restraint, Volume Change, and Reinforcement on Cracking of Mass Concrete, states in Chapter 3 that concrete’s tensile strength is often taken as 6.7 times the square root of its compressive strength. It also notes that where a ...

Plot of Compressive Strength of Concrete vs. Cemen-Water Ratio Fig. 2. Plot of Compressive Strength of Concrete vs. Age Fig. 3. Effect of Cement-Water Ratio on Density of Concrete Cement-Water Ratio (kg/cm 2) 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 75 100 125 150 175 200 225 250 275 7 days after casting 14 days after casting 28 days ...

Feb 05, 2019· Concrete strength is fairly sensitive to environmental effects. 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 extreme weather conditions.

Abstract- The paper deals with the effects of addition of various proportions of polypropylene fiber on the properties of high strength concrete m20 mixes.An experimental program was carried out to explore its effects on compressive strength under different curing condition. the main aim of the investigation program is to study the effect of ...

The compressive strength of concrete is determined by performing compression test on standard sizes of concrete either cubes or cylinders. The proportions of concrete affect partly the strength of concrete, however, water-cement ratio consider the most important factor affecting the strength of concrete [3].

Feb 26, 2016· Strength of hardened concrete measured by the compression test. The compression strength of concrete is a measure of the concrete's ability to resist loads which tend to compress it. The compressive strength is measured by crushing cylindrical concrete specimens in compression testing machine. The compressive strength of concrete is calculated by the failure load

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.

Compressive Strength of Concrete Using Sawdust as Aggregate Daniel Yaw Osei, Emmanuel Nana Jackson Abstract—This paper reports on experimental investigations on the effect of replacing sand with sawdust on the properties of concrete. A concrete mix of 1:2:4 was used as control while sawdust was used to replace 25%, 50%, 75% and 100% of sand ...

Compressive strength of concrete is inversely proportional to workability of concrete. When workability of concrete increases, its compressive strength decreases. Therefore, concrete workability cannot be increased to improve concrete placement and compaction since it declines concrete strength.

Concrete structures deflect, crack, and loose stiffness when subjected to external load. Loss of flexural strength of concrete is largely responsible for cracks in structure. In reinforced concrete structures, the mix proportions of the materials of the concrete and aggregate type determine the compressive strength while the composite action of concrete and steel reinforcement supplies the ...

Effect of curing duration on compressive strength development is presented in Figure 1. Figure 1. Moist Curing Time and Compressive Strength Gain. Higher curing temperatures promote an early strength gain in concrete but may decrease its 28-day strength. Effect of curing temperature on compressive strength development is presented in Figure 2 ...

It should be clear from what has been said above that the detrimental effects of storage of concrete in a dry environment can be reduced if the concrete is adequately cured to prevent excessive moisture loss. Read More: Compressive Strength of Concrete -Cube Test, Procedure, Results. Testing of Concrete Cores for Strength – Sampling and Procedure

@inproceedings{Kim2004SIZEEO, title={SIZE EFFECT ON COMPRESSIVE STRENGTH OF CONCRETE}, author={J. Kim and S. T. Yi}, year={2004} } J. Kim, S. T. Yi Published 2004 It is important to consider an effect of a member size when estimating the ultimate strength of a concrete member loaded for all types of ...

Dec 01, 2003· That tensile strength is the basis for its ability to resist bending, or its flexural strength. ACI 207R, Effect of Restraint, Volume Change, and Reinforcement on Cracking of Mass Concrete, states in Chapter 3 that concrete’s tensile strength is often taken as 6.7 times the square root of its compressive strength. It also notes that where a ...

Plot of Compressive Strength of Concrete vs. Cemen-Water Ratio Fig. 2. Plot of Compressive Strength of Concrete vs. Age Fig. 3. Effect of Cement-Water Ratio on Density of Concrete Cement-Water Ratio (kg/cm 2) 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 75 100 125 150 175 200 225 250 275 7 days after casting 14 days after casting 28 days ...

Jun 29, 2020· 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).