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首页> 外文期刊>Cold regions science and technology >Experimental study of concrete abrasion due to ice friction - Part Ⅰ: Set-up, ice abrasion vs. material properties and exposure conditions
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Experimental study of concrete abrasion due to ice friction - Part Ⅰ: Set-up, ice abrasion vs. material properties and exposure conditions

机译：冰摩擦引起的混凝土磨耗的实验研究-第一部分：结构，冰磨与材料性能和暴露条件的关系

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An accelerated ice abrasion test method has been developed as a part of the study. Through laboratory testing, ice abrasion properties of concrete have been investigated as a function of concrete compressive strength (f_c), nominal ice pressure (P_(ice)) and ice temperature (T_(ice)). The testing was done by sliding a vertically oriented fresh-water ice cylinder in a repetitive back and forth motion on the surface of the concrete specimens. The experiments consisted of two series; one containing laboratory cast specimens without any preceding surface preparation and one with the upper surface removed by sawing. The latter series contained both field samples from an offshore concrete lighthouse and laboratory cast specimens. f_c and P_(ice) were the most important experimental variables governing ice abrasion rates of concrete. Abrasion rates decreased with increasing f_c. There was measured an increase in abrasion rates by increasing P_(ice). For some experiments a tripling in Pice (from 0.5 to 1.5 MPa) led to a quadratic increase in abrasion rates. The experimental results were ambiguous with regard to the effect of T_(ice) on abrasion and no clear relation between the two could be drawn in the present study. Despite significant scatter, the experiments showed that the coefficient of kinetic friction decreased with increasing P_(ice) and f_c. By assuming a Mohr-Coulomb-like model, we estimated a cohesion of 17 kPa and a friction angle of 034° (tan φ = 0.006) for testing where P_(ice) varied between 0.5 and 1.5 MPa. The study included separate measurements of mortar vs. aggregate abrasion relative to the bulk abrasion in concrete. Mortar abrasion was between 25 and 84% greater than the bulk abrasion while aggregate abrasion was approximately half the bulk abrasion. Mortar abrasion was closer to the concrete bulk abrasion for specimens with high strength.
机译：作为研究的一部分，已经开发了一种加速冰磨试验方法。通过实验室测试，已经研究了混凝土的冰磨性能与混凝土抗压强度（f_c），标称冰压（P_（ice））和冰温（T_（ice））的关系。通过在垂直方向上移动淡水冰缸在混凝土试样表面上进行反复往复运动来进行测试。实验包括两个系列。一份包含未经任何表面预处理的实验室铸造样品，另一份包含通过锯切去除的上表面。后一个系列既包含海上混凝土灯塔的现场样本，也包含实验室铸造样本。 f_c和P_（ice）是控制混凝土的冰磨损率最重要的实验变量。磨损率随着f_c的增加而降低。据测量，通过增加P_（ice）可以提高磨损率。对于某些实验，Pice中的三倍（从0.5到1.5 MPa）导致了磨损率的二次增加。关于T_（冰）对磨损的影响，实验结果尚不明确，在本研究中无法得出两者之间的明确关系。尽管有很大的分散，实验表明动摩擦系数随P_（ice）和f_c的增加而减小。通过假设类似Mohr-Coulomb的模型，我们估计内聚力为17 kPa，摩擦角为034°（tanφ= 0.006），以测试P_（ice）在0.5到1.5 MPa之间变化。该研究包括分别测量砂浆与骨料的磨损量相对于混凝土的整体磨损量。砂浆的磨损比整体磨损大25％至84％，而骨料磨损大约是整体磨损的一半。对于高强度的试样，砂浆的磨损更接近于混凝土的整体磨损。

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