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Computers and Concrete
  Volume 25, Number 5, May 2020, pages 401-409
DOI: http://dx.doi.org/10.12989/cac.2020.25.5.401
 


Long-term quality control of self-compacting semi-lightweight concrete using short-term compressive strength and combinatorial artificial neural networks
Moosa Mazloom, Saeed Farahani Tajar and Farzan Mahboubi

 
Abstract
    Artificial neural networks are used as a useful tool in distinct fields of civil engineering these days. In order to control long-term quality of Self-Compacting Semi-Lightweight Concrete (SCSLC), the 90 days compressive strength is considered as a key issue in this paper. In fact, combined artificial neural networks are used to predict the compressive strength of SCSLC at 28 and 90 days. These networks are able to re-establish non-linear and complex relationships straightforwardly. In this study, two types of neural networks, including Radial Basis and Multilayer Perceptron, were used. Four groups of concrete mix designs also were made with two water to cement ratios (W/C) of 0.35 and 0.4, as well as 10% of cement weight was replaced with silica fume in half of the mixes, and different amounts of superplasticizer were used. With the help of rheology test and compressive strength results at 7 and 14 days as inputs, the neural networks were used to estimate the 28 and 90 days compressive strengths of above-mentioned mixes. It was necessary to add the 14 days compressive strength in the input layer to gain acceptable results for 90 days compressive strength. Then proper neural networks were prepared for each mix, following which four existing networks were combined, and the combinatorial neural network model properly predicted the compressive strength of different mix designs.
 
Key Words
    self-compacting semi-lightweight concrete; rheology; compressive strength; artificial neural network
 
Address
Moosa Mazloom, Saeed Farahani Tajar and Farzan Mahboubi: Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
 

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