DESIGN OF DRY BUILDING MIX COMPOSITIONS USING INDUSTRIAL AND CONSTRUCTION WASTE
DOI:
https://doi.org/10.31649/2311-1429-2024-2-52-59Keywords:
dry building mixtures, secondary raw materials, fly ash, brick waste, mathematical modeling, regression analysis, mix design optimizationAbstract
The article presents the results of a comprehensive study on the design of dry building mixture (DBM) compositions using industrial and construction waste. Special attention is given to such types of secondary raw materials as fly ash, blast furnace and steelmaking slags, cement dust, microcalcite, brick debris, concrete rubble, and stone-cutting waste. The technical and environmental feasibility of incorporating these materials into DBMs is substantiated, with the aim of reducing raw material costs, improving resource efficiency, and lowering the environmental burden on ecosystems.
A systematic approach to the analysis and classification of waste is proposed, based on their origin, chemical and granulometric composition, and functional role within the mixture (binders, fillers, mineral additives, modifiers). The methodology for optimizing DBM formulations using regression modeling techniques is outlined. Regression equations have been developed for three main parameters of the mixtures: water-to-binder ratio (W/B), bulk density, and compressive strength. Model parameters were derived through the variation of cement, fly ash, quartz sand, filler particle size, and polypropylene fiber content.
Based on the obtained data, 3D surface graphs were constructed to visualize the influence of each component on the performance of the mixtures. Optimal ranges for the use of fly ash (20–30%), brick debris (5–10%), granular fillers, and microfibers were identified. An example of an optimized DBM composition was developed, which ensures reduced density, improved workability, and sufficient compressive strength without the need for additional chemical admixtures.
The research outcomes may be implemented in the production of environmentally oriented dry building mixtures for finishing, masonry, and repair applications. The proposed approaches are aimed at promoting resource-efficient and sustainable development in the construction industry.
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