矿渣粉加固粉土的理论分析及路用性能研究

提出了矿渣粉加固粉土的相关理论。将矿渣粉在加固土中的作用归结为火山灰胶凝效应和微集料填充效应,而火山灰胶凝效应又可进一步归结为水化作用、激发作用和离子交换作用;认为微集料填充效应与矿渣粉细度极为相关;用框图归纳了矿渣粉加固土的两种作用效应。进行了矿渣粉、石灰粉加固土无侧限饱水抗压强度、水稳定性、冻稳定性、温度收缩和干燥收缩等路用性能试验,并进行比较。结果表明,矿渣粉加固土所测路用性能指标优于石灰粉加固土。为工程应用提供了试验依据。

THEORETICAL ANALYSIS AND FIELD PERFORMANCE OF SILT SOIL REINFORCED WITH SLAG POWDER

The authors introduce the related theories on silt reinforced with slag powder first.The improvement of silt by adding slag power is attributed to the micro-aggregate filling effect and pozzolana binding effect,and the latter effect consists of hydration,inspiration and ion exchanging.It is suggested that the micro-aggregate filling effect is highly correlated with the fineness of slag powder and the two effects are summed up with framed chart.On the other hand,the tests of unconfined saturated compression,water stability,freezing stability,temperature shrinkage and dry shrinkage of silt consolidated by slag powder and silt consolidated by lime power were conducted and the test results were compared.The results indicate that road performance of silt consolidated by slag powder is better than those of silt consolidated by lime powder,which provides experimental evidence to its engineering application.