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针对公路工程石灰稳定黄土早期强度低、耐久性能差及水泥稳定土成本高、施工质量控制难等问题,利用矿渣粉,并掺加激发剂和粉煤灰,综合稳定黄土。按照无机结合料稳定土试验,进行了矿渣粉、石灰和水泥稳定黄土无侧限抗压强度试验,并进行比较。结果表明:同等稳定材料掺量条件下,矿渣粉稳定黄土7 d抗压强度要明显高于石灰稳定黄土,与水泥稳定黄土同期抗压强度相当,而矿渣粉稳定黄土性能价格比最高。分析了矿渣粉稳定黄土机理,认为矿渣粉在激发剂和粉煤灰共同作用下,活性得到充分发挥,产生复合胶凝效应和填充增强效应,提高了土体的7 d抗压强度,并提出矿渣粉稳定黄土机理框图。
Aimed at the problems of low early strength, poor durability and high cost of cement stabilized soil, and poor quality control of construction, limestone stabilized loess in highway engineering is used to synthesize and stabilize loess by using slag powder and adding activator and fly ash. According to the soil test of inorganic binder, the unconfined compressive strength tests of slag, lime and cement stabilized loess were carried out and compared. The results show that the compressive strength of slag-stabilized loess at 7 d is obviously higher than that of lime-stabilized loess under the same stabilizing material dosage, which is equivalent to compressive strength of cement stabilized loess over the same period, while slag loess stabilized loess has the highest performance-price ratio. The mechanism of slag loess stabilization is analyzed. It is concluded that the activity of slag powder is fully exerted under the co-action of the activator and fly ash, resulting in the composite gelling effect and the filling enhancing effect, and the 7 d compressive strength of the soil is raised. Slag powder loess mechanism diagram.