improving compressive strength of concrete by a twostep

Leave Comment

Improving compressive strength of concrete by a two-step ...

Apr 01, 1996  The properties of the two-step mixed concrete and conventional concrete are compared. At 28-day age, concrete mixed by the two-step mixing method showed about 8 to 17% higher compressive strength than the concrete mixed by the normal method, depending upon the water — cement ratio, the mixing process and the type of mixer.

Get price

Compressive Strength of Concrete Definition, Importance ...

Jan 29, 2017  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

Get price

Compressive Strength of Concrete and Concrete Testing ...

May 15, 2020  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 concrete to check whether it has reached or developed beyond the ...

Get price

Compressive Strength of Concrete - CivilWeb Spreadsheets

Compressive Strength of Concrete. The compressive strength of concrete is a measure of the concrete’s ability to resist forces trying to compress or push the concrete together. Concrete is very strong in compression, particularly in comparison to the concrete’s strength in tension and flexure which are relatively weak.

Get price

IMPROVING THE COMPRESSIVE STRENGTH OF CONCRETE

compressive strength. At 0.5 water/cement ratio, the percentage increase in compressive strength was 35%, 7% and 20% at 7, 14 and 28 days respectively, while at 0.6 water/cement ratio the percen tage increase in compressive strength was 60%, 19% and 29%. Keywords: compressive strength, concrete, curing, lime/water solution. 1. INTRODUCTION

Get price

Improving compressive strength of low calcium fly ash ...

concrete. Geopolymer concrete in the presence of alccofine can be used for the general purpose of concrete as required compressive strength can be achieved even at ambient temperature. The 28 days compressive strength of 73 MPa, when cured at 90-degree Celsius, confirmed that it is also very suitable for precast concrete components.

Get price

Improving Compressive strength of Lightweight Aggregate ...

Test results indicated that replacing cement in the structural lightweight concrete developed, with 5–15% silica fume on weight basis, caused up to 57% and 14% increase in compressive strength ...

Get price

Predicting Compressive Strength of Concrete

of concrete compressive strength. Nipatsat and Tangtermsirikul [1] developed equations for estimating compressive strength of concrete containing fly ash with curing ages from 3 days up to 1 year. Kazberuk and Lelusz [2] proposed regression models to predict compressive strength of concrete with fly ash replacement percentages up to 30%.

Get price

Compressive Strength of Concrete and Concrete Testing ...

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 concrete to check whether it has reached or developed beyond the ...

Get price

How to Evaluate the Compressive Strength of Concrete

Mar 03, 2021  Hence the need to perform concrete testing on-site during a pour. It is estimated that concrete reaches 75% of this 28-day compressive strength in 7 days, and its strength will remain stable or even increase over time. Over time, the Concrete’s compressive strength can continue to increase due to a chemical reaction called hydration.

Get price

Compressive strength prediction of high-performance ...

Dec 20, 2020  The concrete mixture is defined as HPC if the early-stage compressive strength is 20 to 28 MPa at 3 to 12 h or 1 to 3 days, based on ASTM C39 “AASHTO T 22” test . Furthermore, the durability and workability of HPC are important factors in structural applications [1] .

Get price

Compressive Strength of Concrete with Admixtures, How to ...

Apr 03, 2020  Compressive Strength of Concrete with Admixtures, How to Increase Strength of Concrete (IS: 516- 1959),Often it is observed, attainment of early compressive strength in concrete is a challenge. Researchers have tried various admixtures to achieve the objective. This work addresses the issue of achieving early compressive strength in concrete using a bacterium called

Get price

Cellulose-Infused Concrete Is One Step Closer to Reality : CEG

In 2015, their findings on the CNC improving concrete's strength and hydration were published, and in summer 2017, the research was taken out of the lab and into the field.

Get price

Improving Concrete Quality - 1st Edition - Karthikeyan H ...

Jun 25, 2014  Improve the Quality of Concrete, Improve the Quality of Construction Quality measurement is not prevalent in the concrete industry and quality investment is not seen as potentially generating a positive return. Improving Concrete Quality examines how and why concrete quality should be measured, and includes instruction on developing specifications with the aim of improving concrete quality ...

Get price

Compressive Strength of Concrete -Cube Test, Procedure ...

Concrete compressive strength for general construction varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and higher in commercial and industrial structures. Compressive strength of concrete depends on many factors such as water-cement ratio, cement strength, quality of concrete material, quality control during the production of concrete, etc.

Get price

Experimental analysis of a modified two-step corbel for ...

The yield strength and ultimate load of two-step corbels with steel fibres were 25% and 38% higher than the values obtained from two-step corbels without steel fibres. However, due to the great difference observed between the duplicate specimens, it is not possible to confirm that the steel fibres had a significant influence on the corbel strength.

Get price

Concrete Compressive Strength- Cube Test and its Procedure

The concrete compressive strength test or cube test represents the quality of poured concrete on the construction site. If concrete cubes do not acquire the required strength then poured concrete is repaired by different methods such as grouting or injection of chemicals to increase the strength of the concrete.

Get price

COMPRESSIVE STRENGTH PROPERTIES OF GLASS FIBER CONCRETE

VII. CONCLUSION The compressive strength of all the three mixes, that is M20, M25 and M30, increases with the addition of glass fibers as compared to compressive strength of conventional concrete. Tests are done after 7 days and 28 days. The compressive strength goes on increasing when the amount of glass fibers is increased in the mix.

Get price

3 Curing Techniques to Improve the Compressive Strength of ...

May 07, 2021  Curing for Compressive Strength of Concrete. Freshly mixed concrete normally contains more water than is required for hydration of the cement; however, excessive loss of water by evaporation can delay or prevent adequate hydration,

Get price

Experimental Study on Improving the Compressive Strength ...

The compressive strength of the material can be improved to some extent by changing the water-cement ratio, the proportion of each component of the material, and the curing method; however, the effect is negligible [6–8].Therefore, a method to improve the compressive strength of a cylindrical turntable by imposing external constraints is proposed in this paper.

Get price

Improving Mechanical Properties of High Strength Concrete ...

E ect on Compressive Strength Values of the compressive strength at 28 days and the variation percentage of magnetic concrete strength in comparison with non-magnetic concrete, were pre-sented in Table 4. In the 28-day sample, we observed an increase of compressive strength in the 400 and 450 cement content. At an age of 90 days, the strength

Get price

Compressive Strength of Concrete Concrete Cubes What ...

Jul 07, 2016  Compressive strength as per American Codes. In case of American codes, compression strength is defined in terms of cylinder strength fc’. Here compressive strength of concrete at 28 days curing is obtained from a standard cylindrical specimen 150mm diameter and 300mm high loaded longitudinally to failure under uniaxial compression loading.

Get price

Influence of the compressive strength of concrete on the ...

Influence of the compressive strength of concrete on the temperature increase due to cyclic loading. November 2020 In book: Proceedings of the fib Symposium 2020 (pp.773 - 780)

Get price

(PDF) CONCRETE MIX, SLUMP AND CONCRETE COMPRESSION TEST ...

The compressive strength of concrete test cube, cylinder and lintel has been determined in the 7th day after making the test. For the average compressive strength of 7th day concrete test cube is 4.63 MPa. The compressive strength of our concrete design is expected to have increased if there were more specimens similar to the tested ones but of ...

Get price

Compressive Strength of Road Pavement - CivilWeb Spreadsheets

The compressive strength of road pavements is commonly specified in concrete road and pavement specifications. This however is slightly odd in that the compressive strength is not a critical parameter for pavement performance, the flexural strength is much more important from a structural point of view.

Get price

Factors Affecting Strength of Concrete - The Constructor

Factors Affecting Strength of Concrete Concrete strength is affected by many factors, such as quality of raw materials, water/cement ratio, coarse/fine aggregate ratio, age of concrete, compaction of concrete, temperature, relative humidity and curing of concrete. Quality

Get price

What measures can be taken to improve the tensile strength ...

Tensile strength of concrete can be increased by increasing its compressive strength as tensile strength is proportional to square root of compressive strength. Further you can add steel or glass fibers to the concrete mix. This will have the most...

Get price

Avoid the False Alarm for Low-Strength Concrete For ...

Jan 16, 2013  The specified strength (f c ’) is the concrete compressive strength used by engineers in the design calculations to determine member sizes and reinforcement details of concrete structures.

Get price

What Is Concrete Compressive Strength? (with pictures)

Concrete may be poured over rebar or other materials in order to increase its compressive strength. People in different parts of the world use different rating systems for measuring concrete compressive strength. In the United States, concrete strength is measured using pounds per square inch, or PSI.

Get price

Study on Effect of Performance of Recycled Aggregate ...

[3] Rejeb Saeed Khalaf, Improving compressive strength of concrete by a two-step mixing method, J. Cement and Concrete Research, 1996, 26 (4) 585-592. DOI: 10.1016/0008-8846(96)00030-0 [4] Sun Chengcheng, Yuan Dong, Song Jianxue, Study on effect of compressive strength of recycled aggregate concrete with secondary mixing process, J. Concrete ...

Get price

Method for increasing the rate of compressive strength ...

Jan 01, 1997  The present invention relates to concrete, mortar and other hardenable mixtures comprising cement and fly ash for use in construction. The invention provides a method for increasing the rate of strength gain of a hardenable mixture containing fly ash by exposing the fly ash to an aqueous slurry of calcium oxide (lime) prior to its incorporation into the hardenable mixture.

Get price

Dynamic behaviour of concrete: the structural effects on ...

Dynamic behaviour of concrete: the structural effects on compressive strength increase H. Le Nard Université d'Orléans, Laboratoire Energétique, Explosions, Structures, 63, avenue de Lattre de Tassigny, 18020 Bourges cedex, France

Get price
Contact us

Submit online

Please leave a message below and we will contact you as soon as possible.