Researchers made lightweight cement with water-derived pores and measured greater compressive strength than in laboratory foamed cement of similar density. Ultrasound and carbonation controlled how water remained inside the mixture before drying. The single peer-reviewed study also measured pore architecture, sound transmission and carbon dioxide uptake. Its results describe prepared specimens, with water absorption remaining substantial and building-scale durability still requiring evaluation.
A laboratory-made lightweight cement specimen reached a compressive strength of 23.90 megapascals. The foamed-cement comparison measured 9.02 megapascals, at a density of roughly 1,050 kilograms per cubic metre. The single peer-reviewed study examined a water-based route to small pores, addressing the loss of strength associated with the larger voids in conventional foamed materials.[1]
The mixture contained cement and water. Ultrasound accompanied carbonation, followed by hydration and drying. Water held within the gel structure left voids as it departed. In the ultrasound-treated UC15 specimen, 96.8% of the pores measured less than 200 nanometres. Total porosity was close to that of the comparison prepared without the same ultrasonic treatment, directing attention to the size and connections of the voids.[1]
Electron microscopy and three-dimensional reconstruction examined the pore network. Connecting channels were shorter and narrower in the treated specimen. A separate helium measurement assessed overall porosity alongside measurements of the voids accessible to mercury.[1]
The experiments also measured sound transmission, water uptake and strength retained after wetting. Substantial absorption remained. Carbon dioxide taken up over twenty-eight days reached 7.11% of cement mass, a carbonation measurement rather than an assessment of the entire manufacturing life cycle. Longer-term durability, production scale and manufacturing cost remain separate questions before application in buildings.[1]
