分子间作用力对制备含有机废弃之水泥浆体影响研究

研究以水泥处理固体有机物时, 有机物对水泥水化的影响.以膜流模式说明水份在水泥浆体内传输的现象.水膜存在半干之水泥浆体, 其厚度小于100 nm, 膜流由离分压所驱动,而离分压来自分子间作用力.膜拟结果发现, 水泥浆体内局部位置可用以进行水化之水量为Q=-Aslv/6vπ.当有机物添加在水泥浆体内时, 会影响Hamaker 常数,Aslv, 因此可能使膜流不稳定或完全抑制膜流, 因而使水泥浆体内局部缺水, 影响水化进行, 造成成品强度降低, 影响品质.

The Effect of Intermolecular Forces on the Preparation of the Organic Waster-Cement Pastes

Organic wasters can be treated with cement to become useful materials. The effect of organic materials on the hydration of cement is discussed in this study. A water film fluid flow model was proposed to describe the transfer of water within the paste. It is supposed that water films exist within the partial dried hydrated cement particles. Water transfers within the water film and diffuses into the cement particles through the porous amorphous medium. For a water film with the film thickness less than 100nm, the disjoining or the conjoining pressure dominates the direction of water flow. The disjoining or the conjoining pressure is produced due to the overlapping of interfacial regions. Simulation results showed that the local water available for hydration reaction is Q=-Aslv/6vπ. The replacement of hydrated cement particles with organic particles would change the Hamaker constant of the water film and therefore reduce the transfer rate of water. When the Hamaker constant is positive, the conjoining pressure makes the film unstable and inhabits the transfer of water to supply the need of cement hydration. The uncompleted hydration of cement will reduce the compressive strength of the final products.