What are the disadvantages of concrete?

What are the disadvantages of concrete?

Disadvantages of Concrete

• Compared to other binding materials, the tensile strength of concrete is relatively low.
• Concrete is less ductile.
• The weight of compared is high compared to its strength.
• Concrete may contains soluble salts. Soluble salts cause efflorescence.

What is RCC FCR?

The estimate of flexural tensile strength or the modulus of rupture or the cracking strength of concrete from cube compressive strength is obtained by the relations fcr = 0.7 fck N/mm2. The tensile strength of concrete in direct tension is obtained experimentally by split cylinder.

What is the most important property of concrete?

compressive strength

What is good quality of concrete?

A concrete is said to be of good quality, if it is strongest, densest, most workable and most economical for the job for which it is prepared. Amount of cement used in concrete should be low and that of aggregate should be high. You may like this What is the verb for dereliction?

What is the minimum slump for concrete?

Very dry mixes having slump 0 – 25 mm are typically used in constructing pavements or roads, low workability mixes having slump 10 – 40 mm are typically used for foundations with light reinforcement, medium workability mixes with slump 50 – 90 mm, are typically used for normal reinforced concrete placed with vibration.

What is a good concrete slump?

Slump. Slump is the measure of concrete consistency and fluidity. It shows the flow and overall workability of freshly mixed concrete. Four-inch (4”) slump is very common with normal weight concrete and is a good for pumping.

What is a good concrete mix?

The safest bet for any concrete mix is four-two-one: four parts crushed rock; two parts sand; and one part cement. The four-two-one mix, obviously, has seven parts. Conveniently, when mixing concrete, the ratio can be mixed on any range of scales.

What additives make concrete stronger?

You can add more Portland cement to bagged concrete to make it stronger. You can also add hydrated lime. To make the strongest concrete, the sand should be sourced from volcanic lava that has a high silica content.

What is 35 MPa concrete used for?

35 MPa CONCRETE Pre-Mixed 35 MPa Concrete is a well-balanced superior mix of Portland cement, stone and sand. This mix is ideal for work requiring concrete with a thickness of 5 cm (2”) or more. Interior and exterior concrete repairs, permanent and deep. You may like this Can anything be a poem?

What is 32 MPa concrete used for?

As a rule of thumb 20mph concrete is fine for foot traffic, I.e., footpaths and house slabs, depending on your sub base, whilst 25 mph is more appropriate for driveways and light traffic. 32mpa and 40mpa concrete is suitable for shed slabs and heavy traffic areas.