Practical Implementation of Internally Cured Concrete Using Superabsorbent Polymers

This study investigates the practical implementation of internally cured plain and slag cement concrete using superabsorbent polymers (SAPs) through a comprehensive field trial. The objective was to develop strategies to successfully deliver and disperse SAP in concrete, evaluate the internal curing performance of SAP in concrete mixtures containing Type IL cement, slag-cement and colloidal nanosilica and evaluate fresh properties, strength development and durability performance of SAP-modified concrete mixes in real-world applications. The incorporation of SAPs aims to enhance internal curing, reduce shrinkage, and improve the long-term performance of concrete structures. Six concrete mixtures were evaluated with Type IL cement, 30% wt. slag cement replacement, 0.15% SAP by weight of cement, and nanosilica (4 oz/cwt) at a constant w/c ratio of 0.44. Comprehensive characterization was conducted to evaluate workability, air content, compressive strength (7, 28, 56, 90, 365 days) and flexural (at 4 days-driven by opening to traffic requirements), durability (rate of water absorption, drying shrinkage, scaling resistance, chloride penetration depth, and resistivity), and hydration kinetics. The study highlights that incorporating SAP into concrete affects its workability, sustains hydration, and enhances durability.