Shape, size, moisture contents and grading are important properties of aggregates.

There many aggregate properties that can affect final concrete product. Of course strength is important (it is estimated that concrete can posses half strength of aggregate particle), but there are more to this. Particle size distribution - the ideal aggregate should contain all fractions from (fine 0,063 - 4 mm and coarse 4 - 63 mm)this way aggregate can fill most of the voids and the structure is more dense. Also the shape of particle is important, the best particles have similar dimensions so they're more or less round (if particle is flat or long - it is not very desirable). Also there is chemical properties. Best case scenario is if you have monomineralic aggregate (like granite), but in the nature aggregates have a lot of impurities. Impurities that should be avoided is ones consisting amorphous SiO2 (like flinstone, opal) these impurities can cause ASR (alkali-silica reaction) or AGR (alkali-aggregate reaction)

Key parameters:

- type of aggregate

- size

- distribution

- moisture content

The following article has an excellent coverage of the subject:

http://www2.ku.edu/~iri/publications/sm43.pdf

As previous researchers mentioned, type, size distribution and mosture content have influence. I think also shape of aggregate can have impact. If it has "sharp" shape I can have higher strength. Also origin can influence on strength. For example granite from different places can have different strength what impact concrete strength and Young modulus.

To the above mentioned parameters just add density (normal density, lightweight, heavyweight and recycled concrete aggregates) which can seriously affect the strength of concrete. For this, the source of the aggregates is also significant because it affects the shape, size and the grading.

In case of strong and denser ITZ, aggregate size and the aggregate strength play important role on concrete strength.

The parameters for the aggregate as such depends upon which type of Civil engineering work they are proposed to be used. For concrete roads, it would be different and for mass concrete and lean concrete it could be different. This can not be generalized

Hi Hassan,

Both coarse aggregates and fine aggregates are the main constituents of concrete because they not only give the body to the concrete, it also have a significant effect on the fresh concrete based on aggregate's shape, size, texture, grading and crushing type.

Density of concrete is determined by the aggregate density as well as soft with porous concrete produce weak concrete with lower wear resistance. That’s why the overall or mechanical properties of concrete depends on the certain properties of aggregates like source of aggregates, normal or light or heavy weight aggregate, size of aggregate, shape of aggregate, crushing type of aggregates, angularity index, surface texture, modulus of elasticity, bulk density, specific gravity, absorption and moisture content, bulking of aggregates, cleanliness, soundness of aggregates, thermal properties and grading of aggregates. Moreover, Interfacial Transition Zone (contact surface between aggregate and cement paste) plays an important role in strength and durability of concrete.

From literature it is clear that crushing type of aggregates definitely has effects on properties of concrete because crushing type of aggregate can change and control the shape factor directly. If you are interested to know about the 'Influence of Crushed Coarse Aggregates on Properties of Concrete', please go through the following article:

Article Influence of Crushed Coarse Aggregates on Properties of Concrete

I think you'll get clear idea how it affects the mechanical properties (compressive strength) of concrete.

Regards,

Imrose

Shape, size, moisture contents and grading are important properties of aggregates.

type, size, size distribution ( grading), density, surface texture , shape (angularity), moisture content, thermal properties, chemical composition, .....

In line with other researchers:

The type, size, particle distribution, moisture content , shape, etc

Aggregate properties affecting concrete compressive strength are:

1- maximum aggregate size, Inversely proportional.

2- grading, well graded aggregate is the best.

3- surface texture, rough aggregate is the best.

4- moisture content, if not accounted in the total water content, it negatively affects strength.

5- percentage of fine materials and impurities in aggregate, if higher than code limitations, it negatively affects strength

Perhaps this link might be useful:

http://sps.utm.my/thecolloquium/files/2017/09/TC-10-9-12.pdf

following

Parameters of aggregates that affect concrete strength:

• The type and strength of the aggregates(the aggregate crushing value (ACV))
• The aggregate cement ratio
• The grading of the aggregates
• The shape, size and texture of the aggregates
• The chemical reactivity and thermal characteristics of the aggregates

There are many factors affect to concrete strength as discussed above.

pl see this article "How shape of aggregate affect to concrete strength"

Article Effect of Shape of Aggregate on Pavement Quality Concrete

Thank you all for your kind help and participation. This question is closed.

Bests.

Shape, max.size, moisture contents and grading are important properties of aggregates

Type(crushed,uncrushed), maximum size, size distribution, toughness(AIV,ACV), shape(flaky, angularity), surface texture, water absorption, density and soundness

Hi

In addition to above parameters, what I can think of is that texture,angularaity，porosity,abrasion and crushing index of aggregates affect strength for concrete products. More importantly, any type of aggregates (porous，rounded shape)could lead to weak ITZ in concrete will reduce strength.

Yes, there many aggregate properties that can affect final concrete product. Of course strength is important (it is estimated that concrete can posses half strength of aggregate particle), but there are more to this. Particle size distribution - the ideal aggregate should contain all fractions from (fine 0,063 - 4 mm and coarse 4 - 63 mm)this way aggregate can fill most of the voids and the structure is more dense. Also the shape of particle is important, the best particles have similar dimensions so they're more or less round (if particle is flat or long - it is not very desirable). Also there is chemical properties. Best case scenario is if you have monomineralic aggregate (like granite), but in the nature aggregates have a lot of impurities.

Some of the important parameters of aggregate are: strength, maximum size, modulus of elasticity, moisture content, texture, shape and its content in the mixture.

Aggregates size distribution, gradation, uniformity, surface roughness, quality, etc.

In addition to above mentioned parameters, origin of rock(quality of parent rock), it's weathering is also an important parameter. Surface rocks Will have lesser specific gravity due to weathering (due to oxidation). Coarse aggregate confirming to intrusive igneous rock family will have higher density/ Specific gravity.., (eg: diorite, gabbro, granite, pegmatite, and peridotite) will satisfy all the requirements/parameters said by researchers.