Effect of alkali on the formation and stability of foam in red mud-based foamed concrete
Source abstract
Abstract
Red mud, a highly alkaline by-product from alumina production, has attracted increasing attention as a raw material for foamed concrete. However, soluble alkalis influence foam formation and stability, therefore the effects of endogenous(red mud) and exogenous(activators) on bubble stability and properties of foamed concrete were investigated. Soluble alkalis increased the pH and reduced the surface tension of the foaming solution, promoting finer initial bubbles, whereas alkalis from RM and activators reduced the absolute zeta potential and gradually lowered pH. The alkalis accelerated the Ostwald ripening rate from 1.12 × 105 to 3.15 × 105 µm3/min, leading to foam instability. Increasing Na2O dosage enhanced slurry viscosity and yield stress by accelerating geopolymerization, compensating for foam instability. Under optimal conditions, the foamed concrete achieved a bulk density of 1081 kg/m3 and a 28 d compressive strength of 2.98 MPa. These results provide insights into foam stability regulation and alkali fixation through synergistic alkali control.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Bauxite Residue and Utilization · Concrete and Cement Materials Research · Magnesium Oxide Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory for Tunnel Engineering, Institute of Geotechnical and Underground Engineering, Shandong University
Institute of Geotechnical and Underground Engineering, Shandong University
Solid Waste Recycling Technology Innovation Center of Shandong Province
National Engineering Research Center for Recycling of Solid Waste
Department of Science and Technology Innovation, Shandong Hi-Speed Group Co., Ltd
Department of Engineering, Shandong Hi-Speed Group Co., Ltd
Funding
Key Technology Research and Development Program of Shandong Province · Project supported by the National Science Foundation for Young Scientists of China · Shandong province key research and development plan · Jinan’s new colleges and universities project · Natural Science Foundation of Shandong Province · Shandong Provincial Natural Science Foundation for Youth
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