Relationship Between 7 and 28 Days CSS for HSC by Use of ANN and Regression Methods

The use of high strength concrete (HSC) has been studied for many years in developed and developing countries. Although, HSC has a few disadvantages, it has many advantages. The concrete with compressive strength (CS) levels in the range of 50 to100.MPa, is called HSC. The most important property of HSC is 28-day CS as a criterion. Sometimes due to time limitations and construction project problems, estimation of 28-day CS based on 7-day CS can be useful. Based on many experimental tests and analysis of the results, three sets of equations are determined with A1J~ and Regression techniques are compared and the best is recommended.