MUMBAI, India, Oct. 11 -- Intellectual Property India has published a patent application (202444033953 A) filed by Karpagam College Of Engineering, Coimbatore, Tamil Nadu, on April 29, 2024, for 'sap foundry sand concrete.'
Inventor(s) include C. Pradeep Kumar; M. Packiyanathan; M. Rajesh Kumar; M. Shanthosh; and B. Vimal Sanjay.
The application for the patent was published on Oct. 10, under issue no. 41/2025.
According to the abstract released by the Intellectual Property India: "Concrete is the important constituent in constructing a building. Due to their importance, lot of research has been carried out from the dawn to dusk in order to improve their performance. Though lot of research has been done still it needs more improvisation in terms of its strength, post-crack performance etc. One of the main thing that affects the concrete is the presence of cracks. The main reason behind those cracks is shrinkage. It is difficult to cast a concrete that is free from shrinkage. Basically, shrinkage refers to change in volume of the concrete. Specifically, the concrete undergoes autogenous shrinkage when they are subjected to curing. Our research area focuses on autogenous shrinkage which happens due to the improper curing and insufficient water. The autogenous shrinkage leads to the development of internal tensile stresses which leads to the formation of cracks. As the concrete are poor in tensile stress the cracks are easily formed. In order to overcome the autogenous shrinkage and improper curing we are using super absorbent polymer in our project. Super absorbent polymer increases the hydration of concrete thereby it reduces the development of tensile stresses in concrete and leads to minimum degree of formation of cracks. The super absorbent polymer which we are using in our project is sodium polyacrylate. In addition to that to overcome the shortage of river sand we are replacing the river sand by foundry sand as fine aggregate. The SAP is added to the concrete in the percentage of 0.2,0.3,0.4 and 0.5 by weight of cement. In addition to that 2% of steel fiber to the weight of cement is added to the concrete.The compressive strength test, tensile strength test and flexural strength test are carried out for the conventional and SAP induced foundry sand concrete. The test results are compared and it has been found that addition of SAP up to 0.4% gives better test results when compared to conventional concrete."
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