Experimental Investigation on Strength and Longevity of High-Performance Concrete Treated with Natural Rubber Latex

Abstract

High-performance concrete, which meets modern standards for compressive strength, durability, and toughness, has gained attention. Researchers recognize that beyond strength, it can be engineered to align with cost and service life requirements. To address the needs of highrise buildings and pavements, mineral admixtures like fly ash, GGBS, and metakaolin are being explored to replace a portion of cement. These admixtures enhance durability, fatigue strength, and toughness. Polymer latexes, such as natural rubber latex, are also being investigated as modifiers for cement concrete to improve its properties. To fulfill current demands, a new type of concrete called Natural Rubber Latex Metakaolin Modified High Performance Concrete (NRLMKHPC) is proposed.

In this study, NRLMKHPC is developed using naturally sourced rubber latex from Hevea trees, locally available aggregates, and locally produced metakaolin. Various percentages of metakaolin (ranging from 0% to 30%) and natural latex (ranging from 0% to 1.5%) are incorporated. Workability of NRLMKHPC mixes is evaluated through Vee-Bee tests and compaction factor tests. Concrete cubes (150mm x 150mm x 150mm), beam specimens (100mm x 100mm x 500mm), and cylindrical specimens (150mm diameter, 300mm height) are cast for each mix percentage. Compressive strength, flexural strength, and split tensile strength are determined. Durability tests such as rapid chloride ion permeability test are conducted, and acid immersion tests with hydrochloric acid and sulfuric acid are planned to assess NRLMKHPC durability under different water-to-binder ratios. Experimental results are used to develop statistical models linking key parameters to concrete strength and durability