Spent citrus peel bioadmixture for sustainable high performance concrete
A bioadmixture derived from spent citrus peel—a low-value side stream from pectin production—uses natural cellulose, hemicellulose, pectin, sugars, and organic acids to improve concrete workability, internal curing, hydration control, and strength. The project will quantify effects, optimize processing, and pilot-scale validate for commercial readiness.
Overview
This project develops a multifunctional bioadmixture for concrete from spent citrus peel, the fibrous residue left after pectin extraction. By converting a low-value agricultural side stream into a construction material, the technology offers a sustainable path to enhance concrete performance while reducing waste. The peel is conditioned through dewatering, drying, milling, and optional mild pH adjustment, then incorporated directly into cementitious mixtures. The resulting admixture leverages the natural chemistry of citrus peel to improve fresh and hardened concrete properties without complex processing.
Technical specifications
The bioadmixture works through several complementary mechanisms:
- Cellulose acts as a physical microfiller and fiber, increasing mechanical strength.
- Hemicellulose provides an internal curing effect by helping maintain internal moisture.
- Pectin functions as a natural viscosity-modifying admixture, improving cohesiveness, stability, and rheological control.
- Sugars regulate early-age hydration and setting time.
- Organic acids, which the research team has demonstrated can control concrete hydration kinetics, help fine-tune performance.
The planned 12-month study will characterize representative spent citrus peel lots for moisture, pH, particle size, cellulose, hemicellulose, residual pectin, soluble organics, and ash. It will then optimize conditioning methods and evaluate dosage effects on concrete rheology, setting, hydration, strength, pore structure, transport properties, and durability. The project will conclude with pilot-scale concrete trials, quality control and processing specifications, cost assessment, and commercialization planning.
Technology readiness level
The technology is at an early development stage. The beneficial roles of individual components are already established in the scientific literature, and the team has experimental evidence on organic acid effects. The structured project plan moves from material characterization and dosage optimization through pilot-scale validation, providing a clear pathway toward commercial deployment within 12 months.
About Louisiana State University
Louisiana State University is a flagship public land-grant university in Baton Rouge, serving a large student body and a comprehensive research enterprise. A research and technology park provides incubator space, corporate labs, and direct access to campus expertise. A statewide extension network and field sites connect companies to real-world testing, and system-wide health sciences partners support clinical collaboration. Gulf Coast location offers access to suppliers, infrastructure, and demonstration sites. Research is backed by federal funding from NSF, NIH, DOE, USDA, and DoD, and a technology transfer office streamlines IP and startup formation.
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