矿渣粉稳定黄土强度试验及机理分析

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。

Strength Experiment and Mechanism Analysis of Loess Stabilized with Slag Powder

Directing against the problems that low early strength and bad durability of loess stabilized with lime or lime and fly ash,high cost and hard control of construction quality of loess stabilized with cement in highway engineering,slag powders,inspiring agents and fly ash are utilized to stabilize loess.According to test methods of inorganic binding materials consolidating sand,the unconfined compressive strengths of loess stabilized with slag powder,lime and cement are tested and compared.The results indicate that compressive strengths at 7 day of loess stabilized with slag powder are evidently higher than those of loess stabilized with lime and are corresponding with those of loess stabilized with cement.However,the ratios of properties to price of loess stabilized with slag powder are the highest.The consolidation mechanism is analyzed and it is considered that on the actions of inspiring agent and fly ash,activities of slag are plenty given out and the composite binding effect and the fill strengthening effect are existed,whose products can enhance compressive strength of stabilized loess.Finally,a framed diagram on mechanism of loess stabilized with slag powder is put forward.