Using of Backpropagation Neural Network in Estimation of Compressive Strength of Waste Concrete

Document Type : Regular Article


1 Associate Professor, Department of Civil Engineering, Shahrekord University, Shahrekord, Iran

2 M.Sc. Student, Department of Civil Engineering, Shahrekord University, Shahrekord, Iran

3 Ph.D., Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran


Waste concrete is one of the most usable and economic kind of concrete which is used in many civil projects all around the world, and its importance is undeniable. Also, the explanation of constructional process and destruction of them cause the extensive growth of irreversible waste to the industry cycle, which can be as one of the main damaging factors to the economy. In this investigation, with using of constructional waste included concrete waste, brick, ceramic and tile and stone new aggregate was made. Also it was used with different weight ratios of cement in the mix design. The results of laboratory studies showed that the using of the ratio of sand to cement 1 and waste aggregate with 20% weight ratio (W20), replacing of normal aggregate, increased the 28 days compressive strength to the maximum stage 45.23 MPa. In the next stage, in order to develop the experimental results backpropagation neural network was used. This network with about 91% regression, 0.24 error, and 1.41 seconds, is a proper method for estimating results.


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