China 
Africa 
Explore chapters and articles related to this topic
An influence of the water supply in improved soil against liquefaction
Published in Renato Lancellotta, Carlo Viggiani, Alessandro Flora, Filomena de Silva, Lucia Mele, Geotechnical Engineering for the Preservation of Monuments and Historic Sites III, 2022
The foundations of historical buildings, like other elements, are an integral part of their identity and originality should be preserved as much as possible. For this reason, the use of sodium polyacrylate (SPA) as a special ground improvement technique is a preferable process as it can be done without any intervention to the building. Nesil & Evirgen (2022) revealed in their study that the addition of SPA improves the mechanical properties of the soil and leads to an increase in shear strength more than two times. Sodium polyacrylate is a chemical agent capable of absorbing considerable amounts of water. SPA is in a white powder-like form and when it comes into contact with a liquid, it immediately swells and turns into a gel state. Simatupang et al. (2017) reported that a significant improvement in liquefaction occurred mainly at a low degree of saturation. Therefore, the utility of aforementioned chemical agent inside soil improvement applications may enhance the resistance against liquefaction by reducing soil saturation and increasing viscosity. In this study, the effect of SPA on improving the sandy soil parameters depending on the water supply conditions was investigated. For this purpose, shaking table experiments were carried out in a special test box with 3 different application method as complete mixing operation, horizontal case and vertical case. When the test results were evaluated, it was observed that the SPA could be used for soil improvement against liquefaction, and the water supply had a significant effect on the change in excess pore water pressure as well as settlement values.
Experimental Study on Water Retention and Flame Retardancy of Environmental Protection Slurry of Film Coated Gasification Slag
Published in Combustion Science and Technology, 2023
Hao Shao, Huan Hu, Qingzi Lu, Shuguang Jing, Xiaodong Pei, Zhengyan Wu
The sodium polyacrylate is a water-soluble polymer with a negative charge and a viscosity about 15–20 times higher than that of sodium alginate. The thermal stability, mechanical stability and storage stability of sodium polyacrylate are better due to the high number of hydrophilic groups in its molecules, which could play a role in water retention.