Eco-efficient symbio-pozzolanic hydrophobic cementitious binders for sustainable and durable infrastructure
Joseph Gnanaraj S, Harisankar V, Abhishek Anil, Vasugi K
TL;DR
This study introduces a new eco-friendly cement binder that improves durability and reduces water absorption while lowering CO₂ emissions.
Contribution
The novel Symbio-Pozzolanic Composite Hydrophobic Powder (SPCHP) is developed for sustainable and durable cementitious materials.
Findings
A 25% SPCHP mix achieved 73% compressive strength of control mortar with strong hydrophobicity.
SPCHP reduced water absorption to 4.2% and improved resistance to chloride, sulphate, and acid.
The material showed lower CO₂ emissions and favorable cost-to-strength ratios.
Abstract
This study presents the development of an internally hydrophobic cementitious binder through the incorporation of a Symbio-Pozzolanic Composite Hydrophobic Powder (SPCHP), synthesized from fly ash, silica fume, metakaolin, and zinc stearate. SPCHP was introduced as a partial cement replacement at levels ranging from 5% to 40%, and its effects were systematically evaluated in terms of fresh properties, mechanical performance, durability, microstructural behaviour, and cost efficiency. The mix containing 25 wt% SPCHP (HP25) exhibited the most balanced performance, achieving 73% of the compressive strength of the control mortar while imparting strong hydrophobicity (water contact angle of 114°) and reducing water absorption to 4.2%. Enhanced resistance against chloride ingress, sulphate and acid attack, along with improved ultrasonic pulse velocity, confirmed the role of SPCHP in…
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Taxonomy
TopicsConcrete and Cement Materials Research · Microbial Applications in Construction Materials · Magnesium Oxide Properties and Applications