التنبؤ بقيمة مقاومة الضغط عند أي عمر للخرسانة بواسطة الماتلاب

Abstract

Due to the great expansion in executing concrete constructions، where concrete is the most important element required for construction، concrete strength is considered one of the most important criteria for assessing its quality. Due to the ease of carrying out compression testing، concrete strength can also be used as a reference for approval or disapproval of a certain concrete.

The availability of much records and knowing the constituents of concrete that affect concrete properties such as cement content and water/cement ratio can facilitate the estimation of concrete strength through using statistical relationships. Because of the high accuracy of engineering software packages، accurate results can be gotten through using them in research. For this reason MATLAB program was used to estimate the strength of concrete at certain ages.

In this research many cubes of concrete which were made of Ordinary Portland cement were prepared and tested at ages of 28، 60، 90، 180 and 365 days to find out their compressive strength. The samples were exposed to deferent curing conditions namely air، tap water، and sea water. Then the results of compressive strength were contrasted and MATLAB was used for analyzing the test results in order to extrapolate future results، and to derive equations that link compressive strength and concrete age under any curing conditions.

Equations for concrete compressive strength at ages up to 365 days were developed and their estimate results were compared with actual laboratory results at the same age; the results were almost the same.