What is the compressive strength of cement mortar?

Answer 1

Compressive strength measures the largest compression force the material can withstand before it loses its shape or fails.

Answer 2

The strength of concrete varies considerably, depending on a number of variables.

Is the force acting to compress the concrete? Or is the force trying to pull it apart?

Was the concrete mixture made with a high percentage of water or a low percentage of water?

How large are the aggregates? Were procedures taken to ensure air bubbles or air pockets were removed? Was the concrete kept moist while it cured? Was the concrete placed properly - or was it spread out over long distances or dropped from high above? Does the concrete have any added chemicals that change its properties (admixtures)? What the outside temperature appropriate when the concrete was poured?

In most situations I have come across, the concrete is specified by the architect or engineer to be able to safely resist around 4,000 pounds per square inch in compression. Concrete is much weaker in tension (forces trying to pull it apart rather than crush it). Thus, concrete makes the most sense when used as a column. However, even columns occasionally experience high wind speeds that try to bend it over sideways, and it is often convenient to also have beams and entire buildings made of a concrete frame. For this reason, it is necessary to place steel bars inside of the concrete in areas where the concrete is likely to experience something other than compression (shear or tension, for example). The steel bars are extremely good at resisting tension, they bond well to the concrete, and they expand and contract at about the same rate as the temperature heats up and cools down. Also, the concrete all around the steel protects the steel from rusting.

As you can see, the strength of concrete varies considerably depending on its mixtures, craftsmanship, and a long list of other factors. But in general every day design it is typically designed to resist anywhere from 3,000 to 5,000 pounds per square inch for compression. Concrete should never be used to resist tension (unless it is properly reinforced).

Also, it is crucial to understand that it takes standard concrete 28 days to cure and gain its full strength (it continues to increase in strength from there on - but only very slightly). Do not load concrete that has not been cured, and be sure uncured concrete is adequately braced.

Answer 3

Strength of Concrete is taken as the 28 -Day Characteristic strength.

Denoted as M15..where M~Mix

15~15 N/sq.mm or 150 Kg/sq.cm

Common values of strength are

M15

M20

M25-generally used in construction

M40

M60

M80-extremely high strength.

Answer 4

The resistance capacity of any material, but especially structural members, to crushing force. Compressive strength is usuallyexpressed as the maximum number of pounds per square inch that can be resisted without failure.

Answer 5

normal concrete 3000 psi (20.7 MPa),, high strength concrete 7,000 to 14,500 psi

Answer 6

depends on the pour quality you have different psi strength pours

Answer 7

Concrete is manufactured or mixed to different compressive strengths depending on its use.

Answer 8

as per IS1077:1992 it is 3 to 35 N/mm2.

Answer 9

4500PSI