Behavior of High-Strength Concrete with Partial Cement Replacement by Clay Pozzolana and PCE

Mrs. Pandya Nidhi M., Prof. Dhruti M. Pandya

1.Department of Civil Engineering, Assistant Professor, Sardar Patel College of Engineering and Technology,Bakrol,Anand, Gujarat, India

2. Department of Civil Engineering Assistant professor, SVIT vasad

ABSTRACT:Concrete is a versatile composite material widely used in both small- and large-scale construction due to its high compressive strength and availability. Increasing environmental concerns and demand for raw materials have encouraged the use of clay pozzolana as a partial replacement for cement. This study investigates the feasibility of substituting cement with clay pozzolana in proportions ranging from 0% to 25%. A slump test was conducted to evaluate fresh concrete properties, while mechanical properties such as compressive, tensile, and flexural strength were tested at 7, 28, and 56 days. Results showed that higher replacement levels reduced the induction period and setting times. Clay pozzolana improved microstructure and pore distribution, enhancing early hydration. Concrete mixes were prepared at a constant water-cement ratio of 0.35, and Poly Carboxylic Ether (PCE) admixture was used for performance improvement. Water absorption was measured at 28 days, and durability tests at 56 days. A cost comparison with M50 grade concrete indicated potential economic benefits.

KEYWORDS: Clay Pozzolana, Cement Replacement, High-Strength Concrete, Poly Carboxylic Ether (PCE) & Hydration Process