Title: Performance of OPC blended concretes incorporating 25% GGBS and 15% fly ash: hydration, strength, and durability

Authors: Anita C. Suryawanshi; Sameer S. Shastri

Addresses: Sinhgad College of Engineering, Vadgaon (Bk), Pune, India; Army Institute of Technology, Dighi Pune, India ' Department and Guide, Sinhgad College of Engineering, Vadgaon (Bk), Pune, India

Abstract: This study examines the effectiveness of initial curing methods for concrete incorporating blended cement, with an emphasis on hydration behaviour under laboratory and field conditions. Blended cements, comprising Portland cement with supplementary cementitious materials (SCMs), are increasingly used due to their durability benefits and reduced environmental footprint. However, their hydration kinetics and curing requirements differ from those of ordinary Portland cement. Laboratory experiments were conducted on blended cement concretes of grades M25, M30, and M40 to evaluate compressive strength development, heat evolution, and degree of hydration under varying initial curing regimes. Field investigations were also performed to validate laboratory findings in practical conditions. Results demonstrate that initial curing practices have a significant impact on hydration, early-age strength, and long-term durability. Alternative curing approaches were found to accelerate hydration and enhance performance. The study provides insights and practical recommendations for optimising initial curing to maximise the efficiency of blended cement concretes.

Keywords: initial curing; blended cement; hydration kinetics; strength development; durability; laboratory; field conditions.

DOI: 10.1504/IJSTRUCTE.2026.151681

International Journal of Structural Engineering, 2026 Vol.16 No.1, pp.1 - 28

Received: 17 Apr 2025
Accepted: 19 Aug 2025
Published online: 13 Feb 2026 *

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