Aggregate is classified as two different types coarse and fine Coarse aggregate is usually greater than 4 75 mm retained on a No 4 sieve while fine aggregate is less than 4 75 mm passing the No 4 sieve The compressive aggregate strength is an important factor in the selection of aggregate

Effects of Coarse Aggregate Size on the Compressive Strength of Concrete This study investigates the effect of aggregate size on the compressive strength of concrete Two nominal mixes that is 1 2 4 and 1 3 6 were used in the study Concrete cubes were produced with 6 10 12 5 20 and 25 mm aggregates for the two nominal mixes and they were

The aggregate strength is usually not a factor except in lightweight and high strength concrete However aggregate characteristics other than strength such as the size shape surface texture grading and mineralogy are known to affect concrete strength in varying degrees Size The maximum size of a well-graded coarse aggregate of a given

COARSE AGGREGATES IN HIGH STRENGTH CONCRETE Given the critical role that the interfacial transition plays in high-strength concrete the mechanical properties of coarse aggregate will have a more pronounced effect than they would in conventional-strength concrete

Jul 07 2014· According to size the aggregates are classified as Fine Aggregate Coarse Aggregate All in Aggregate Fine Aggregate It is the aggregate most of which passes 4 75 mm IS sieve and contains only so much coarser as is permitted by specification According to source fine aggregate may be described as Natural Sand it is the aggregate …

While we talk about the strength of coarse aggregates it refers to the crushing strength of the aggregate itself However the required information on strength of coarse aggregates can be obtained from indirect tests crushing strength of prepared rock samples crushed value of bulk aggregate and performance of aggregate in concrete

The properties of concrete were studied when the proportions of 37 5 and 19 5 mm stone in the coarse aggregate were varied With the cement content of 160 kg m 3 and the ratio of water cement w c greater than 0 9 the compressive strength is maximum at 25 percent by weight w o of 37 5 mm stone Conversely for the cement content of 350 kg m 3 and w c ratios of less than 0 50 maximum

Jimoh A A and Awe S S 2007 A study on the influence of aggregate size and type on the compressive strength of concrete J of Research Information in Civil Engin 4 157-168 6 Xie W Jin Y and Li S 2012 Experimental research on the influence of grain size of coarse aggregates on pebble concrete compressive strength Applied Mechanics and

The effects of aggregate type size and content on the behavior of normal and high-strength concrete and the relationships between compressive strength flexural strength…

It can also be clearly seen in the mix design procedure that greater the maximum size of coarse aggregate used less is the cement required to achieve the target strength So undoubtedly greater the maximum size of aggregate the greater the compressive strength of concrete made

In this study the control of the cement content is intended to properly understand the compressive strength for different concrete mixes without being influenced by the cementitious material effects Many combinations of aggregates were tested and the optimum aggregate sizes to increase the compressive strength were selected

Tests were carried out to study the effect of the coarse aggregate type on the compressive strength splitting tensile strength fracture energy characteristic length and elastic modulus of

May 18 2018· Compressive Strength of concrete is defined as the Characteristic strength of 150mm size concrete cubes 28 days Compressive strength of Concrete and its importance - As we all know that concrete is a mixture of sand cement and aggregate

This is similar to the effect of aggregate size on the compressive strength Also the reason could be due to the counterbalance between the benefit from the more cementitious paste matrix produced and the adverse effect from the larger stress concentration caused when the larger-size coarse aggregates …

The effects of aggregate type size and content on the behavior of normal and high-strength concrete and the relationships between compressive strength flexural strength and fracture energy are discussed The concrete mixtures incorporate either basalt or crushed limestone aggregate sizes of 12 mm h in or 19 mm Y in and

It was found that the size of the coarse aggregate that offered a maximum compressive strength is in the range of 12 5 25 mm Furthermore the size of the coarse aggregate does not affect the trend results on ambient vs oven-cured specimen as well as the days of curing

processing Also unit weight slump ultrasonic pulse velocity and compressive strength of concrete were determined The test results indicated that there is a good correlation between the some shape properties of aggregate and compressive strength Keywords Aggregate shape Digital image processing Concrete Compressive strength

compressive strength decreases with the increase in the maximum coarse aggregates size Bhiskshma and Florence 7 assessed the effect of size in higher grade concrete using high volume fly ash and found out that maximum size of coarse aggregates of 12 5mm gave the highest compressive…

There is much controversy concerning the effects of coarse aggregate size on concrete compressive strength Tests by Zhou Barr and Lydon 6 show that compressive strength increases with increase in coarse aggregate size However most other studies disagree Walker and …

compressive strengths The results show that the smallest coarse aggregate size gave the highest compressive strength and lowest slump at constant water cement ratio A regression analysis also shows that the relationship between the maximum coarse aggregate size and the compressive strength follows a polynomial with R 2= 1

Effect of Aggregate Size on Strength How To Posted on March 01 1980 Problem Clinic Effect of Aggregate Size on Strength If the quantities of coarse aggregate fine aggregate cement and water are the same for both mixes the mix with l l 2-inch aggregate will have greater slump and will probably bleed more If both mixes are plastic the

This research comparison of compressive and flexural strength of concrete made from different coarse aggregates written in accordance to British standard The different sizes of coarse aggregates used are 10mm 12 mm and 20mm These aggregates were used to produce concrete cubes 150mm x 150mm x 150mm and beans 150 x 150mm x 150mm

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

Abstrsct Aggregate grading is an important element in concrete mixing and the resultant compression strength An experiment was conducted to determine the effect of aggregate size on the

Increasing the granular composition of the aggregate increases the efficiency utilization of cement in concretes working in compression At the same time there is a reduction in deformation and an increase in Young s modulus and unit weight of the concrete The tensile strength of the concrete is severely affected by increasing the size of the aggregate On increasing the maximum grain size

Sep 02 2014· 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 use

strength Kaplan 8 studied the effects of the properties of coarse aggregates on the flexural and compressive strength of high-strength and normal-strength concrete Walker et al 9 studied the effects of coarse aggregate size on the properties of normal-strength concrete Their work demonstrates that an increase in aggregate size

aggregates exhibited more compressive strength for both 1 weeks and 4 weeks than A-2 coarse aggregates Compressive strength was increased moderately for both type crushed aggregates with the decrease of w c ratio For A-1 coarse aggregate lower compressive strength 14 MPa was recorded for Group-I and higher compressive

Jan 01 2015· The compressive strength and flexural strength therefore play a crucial role Effect of varying coarse aggregate size on the flexural and compressive strengths of …

Aitcin 5 told that high amount of coarse aggregate decreases the free shrinkage but increases the micro-cracks in the paste If the aggregate grain size is low or high it causes poor workability and less durability 4 6 The amount of the coarse and fine aggregate should be in equilibrium

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