Development of Self sealing Concrete using Super absorbent Polymers

Abstract

Super absorbent polymers (SAP) are a novel and effective chemical additive with a wide newlinerange of applications for concrete. Superabsorbent polymers are able to absorb 300 400% of their weight in water. This newlineproperty allows the SAP to be utilised in concrete to self-seal cracks, hence reducing water flow. One of the different varieties of highly absorbent is hydrogel polymers. When Super Absorbent Polymers (SAPs) are added to the concrete mixing stage, they can affect the water-cement ratio in the following ways: Water Absorption: SAPs have the ability to absorb and retain significant amounts of newlinewater. When added to the concrete mix, they absorb water, thereby reducing the free newlinewater available for the cement hydration process. As a result, the water-cement ratio newlinedecreases, meaning there is less water available per unit of cement. Water Retention: SAPs also have the capacity to retain water within their structure. This retained water is gradually released during the curing period, providing a controlled supply of moisture to the concrete. As a result, the SAPs help maintain the required moisture level for proper cement hydration and prevent excessive moisture loss from the concrete. This can be particularly beneficial in hot and dry conditions where rapid moisture evaporation can occur. Increased Workability: SAPs can enhance the workability of the concrete mix. Due to their water-absorbing nature, they can act as internal lubricants, reducing the internal friction within the concrete mixture. This improved workability allows for easier mixing, placing, and finishing of the concrete, without the need for additional water. Consequently, the water-cement ratio can be lowered while maintaining the desired workability. The primary usage of this SAP is in agriculture. In this work, cylinder-shaped concrete samples of grades M20 and M25 were cast with various SAP dosages. The major goal of this research is to create self-sealing concrete, which will limit the flow of water that penetrates the concrete.