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The Capillarity of Mica-Rich Base-Course Aggregates

机译:云母丰富的基础课程集合体的毛细作用

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In regions of temperate climate, the destructive influence of frost is the main contributor to damage of a road structure. Commonly, the frost susceptibility of base-course aggregates is often ignored in road construction. However, a number of studies on aggregates for construction purposes, and field observations of road failures, indicate a negative influence of mica-rich rock aggregates (used in unbound applications) on the service life of road construction. The scope of the current work investigates the capillary properties of unbound base-course aggregates with varying free mica grains. The materials studied in this research are commercially available road construction aggregates, and originate from different regions of Sweden. The mineral composition of the samples has been determined by polarizing microscopy using a point-count method. The parameter characterizing the capillarity was measured using the test for determining capillary rise (WMB24). The results show that there is a direct correlation between mica content of the aggregates and water suction by capillary forces. Therefore, mica-rich materials susceptible to frost heave, thus confirming the tendency for frost damage of unbound aggregates.
机译:在温带气候地区,霜冻的破坏性影响是造成道路结构损坏的主要因素。通常,在公路建设中经常会忽略基层骨料的霜冻敏感性。但是,许多关于建筑用骨料的研究以及对道路破坏的现场观察表明,富含云母的岩石骨料(用于非结合应用)对道路建设的使用寿命有负面影响。当前工作的范围研究了具有变化的自由云母颗粒的未结合的基础路线聚集体的毛细特性。本研究中研究的材料是可商购的道路施工骨料,来自瑞典的不同地区。样品的矿物成分已通过偏光显微镜使用点数法确定。使用确定毛细血管上升的测试(WMB24)测量表征毛细作用的参数。结果表明,聚集体的云母含量与毛细作用力吸水有直接关系。因此,富含云母的材料易受冻胀的影响,从而证实了未结合骨料的冻害趋势。

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