A computational model for thick concrete slab demolition using soundless chemical demolition agent

Green demolition technology of reinforced concrete slab: Application of soundless chemical demolition agents and its evaluation system

“…To simplify the t into a dimensionless parameter, the ratio of the t to the time to stabilization ( t s ) was proposed by Jiang et al 37 The t s was the time required for cracks to develop into stable stage. Meanwhile, Natanzi et al 38 obtained the mathematical formula between the ambient temperature ( T ambient ) and expansive pressure onset ( t Peak ) by testing the SCDAs with design service temperature of 10–25°C, as given in Equation ().…”

“…Jiang et al 37 carried out research on demolishing thick concrete slabs using SCDAs and proposed the technology of cutting off upper longitudinal reinforcements along the hole connecting line. The holes with vertical rows and columns were arranged vertically downward on the top surface of thick concrete slabs.…”

“…In this study, the t course was used to represent the progress of the expansive pressure development and the demolition process. Besides, the hole layout form was the same as that in the study of Jiang et al 37 The concept of constraint was still applicable, as shown in Figure 12. For SCDAs in a single hole, the peripheral constraint area is a cylinder coaxial with the hole.…”

“…However, the reinforced concrete members are the major demolition objects in concrete buildings. [33][34][35] The influence of reinforcements inside members has not been reported, and no studies have explored the optimal hole layout scheme for reinforced concrete members.…”

Mechanistic Study of a Microwave Field-Controlled Static Crushing Agent for Efficient Rock Breaking

“…Toshio Kono was the first to conduct theoretical research on expansion agents, pointing out that the magnitude of expansion pressure depends on the growth of Ca­(OH) 2 crystals and finding that the ambient temperature and the thermal conductivity of the crushed material are the main factors affecting their growth . A large number of scholars at home and abroad have conducted a large number of experimental studies and found that the ratio of water agent, temperature, and pore size are the main factors affecting the expansion pressure of the static crushing agent. − Among them, temperature is the key factor affecting the speed and peak pressure of static crushing agent, and many other studies have shown that the higher the temperature, the faster the peak pressure is reached, and the peak expansion pressure can be increased by increasing the pore size and suitable water agent ratio. , The peak expansion pressure can be increased by increasing the pore size and suitable water agent ratio. Some scholars focused on the improvement of temperature on the reaction efficiency of static breakers, indicating that the reaction rate can be changed by increasing the temperature. , …”