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##### Asked by: Abdul Gangkofner

business and finance civil engineering industry# What do you mean by characteristic strength of concrete?

Last Updated: 21st February, 2020

**characteristic strength**is defined as the

**strength**of the

**concrete**below which not more than 5%of the test results

**are**expected to fall. The horizontalaxis represents the values of compressive

**strength**in MPa.The vertical axis represents the number of test samples for aparticular compressive

**strength**.

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Thereof, how do you calculate the strength of concrete?

**Calculation**: The measured compressive**strength** of the specimen shall be **calculated** bydividing the maximum load applied to the specimen during the testby the cross sectional Area, **calculated** from the meandimensions of the section and shall be expressed to the nearest kgper cm2.

Secondly, what is the difference between characteristic strength and design strength? **Characteristic strength** of concrete would alsogive us the compressive **strength** of a particuar mix ofconcrete. Thus, while compressive **strength** gives us the**strength** of a single sample, **characteristic strength**would give us the probable **strength** based on a number ofsamples, which would be a more realistic assessment.

In this regard, what is characteristic load and strength?

**Characteristic Load** or ultimate**load** **Characteristic load** is that value of **load**which has a 95 percent probability of not being exceeded during thelife time of the structure. In absence of any data, **loads**given in various standards shall be assumed as the**characteristic loads**.

What is characteristic strength of m20 concrete?

Compressive Strength Table of Concrete at 7 & 28Days

Grade of Concrete | Minimum compressive strength N/mm2 at 7 days | Specified characteristic compressive strength (N/mm2) at 28days |
---|---|---|

M15 | 10 | 15 |

M20 | 13.5 | 20 |

M25 | 17 | 25 |

M30 | 20 | 30 |