燃煤固硫灰渣混凝土路面材料研究

Study on Concrete Pavement Materials Using Fluidized Bed Combustion Coal Ashes

降低农村公路造价具有重要的现实意义,利用地方工业固体废弃物是一种途径.通过对燃煤固硫灰渣胶凝系统的试验研究,结果表明:燃煤固硫灰渣表面疏松和阴离子聚合度低的特征,使其具有显著的火山灰效应,可与碱、硫酸盐激发剂组成胶凝系统,其中固硫灰渣占70%以上;掺加水泥和增大硫酸盐激发剂掺量能显著改善系统早期性能,硫酸盐掺量宜大于1.5%;燃煤固硫灰渣混凝土具有较好的强度性能和材料韧性,在农村公路中应用具有现实可行性.

Using local industrial solid waste to reduce the building cost of rural road is very important.With the experimental study on cementitious system mixed with fluidized bed combustion coal ashes,the results show that：fluidized bed combustion coal ashes have a significant pozzolanic activity due to the characteristic of porous surface and low degree of anionic polymerization,and these ashes can be organized a cementitious systems with alkali and sulfate activator,in which the fluidized bed combustion coal ashes could be up to 70%.Mixing cement and increasing the amount of sulfate-activating agent can improve the early performance of the system significantly.Especially,the dosage of sodium sulfate must be more than 1.5%.The properties of concrete mixed with fluidized bed combustion coal ashes are suitable in terms of strength and brittleness which make it be used in the rural road successfully.