Carbonation Coefficients from Concrete Made with High-Absorption Limestone Aggregate
Carbonation Coefficients from Concrete Made with High-Absorption Limestone Aggregate
复制标题
高吸水性石灰石骨料混凝土的碳化系数
DOI：
10.1155/2013/734031
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发表时间：
2013
影响因子：
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通讯作者：
E. I. Moreno
中科院分区：
文献类型：
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作者：
E. I. Moreno
混凝土中使用的普通骨料的吸收水平，粗骨料为0.2%至4%，细骨料为0.2%至2%。然而，有些聚集体的吸收水平高于这些值。由于混凝土的孔隙率与水泥浆体和骨料的孔隙率有关，而且碳化率是材料孔隙率的函数，因此从耐久性的角度来看，人们担心这种高孔隙率材料对实现高质量混凝土的影响。因此，本研究的目的是研究高吸收率石灰石骨料混凝土试件的碳化率。使用四种不同的水灰比，圆柱形混凝土试件暴露于加速碳化。混凝土试样的高孔隙率值超出了耐久混凝土的预期极限。然而，与普通质量混凝土相关的碳化系数是在最低水灰比下获得的，这表明尽管这种材料的孔隙率很高，但可以获得耐用的混凝土。
Normal aggregates employed in concrete have absorption levels in the range of 0.2% to 4% for coarse aggregate and 0.2 to 2% for fine aggregate. However, some aggregates have absorption levels above these values. As the porosity of concrete is related to the porosity of both the cement paste and the aggregate and the carbonation rate is a function, among other things, of the porosity of the material, there is concern about the effect of this high porosity material in achieving good quality concrete from the durability point of view. Thus, the objective of this investigation was to study the carbonation rates of concrete specimens made with high-absorption limestone aggregate. Four different water/cement ratios were used, and cylindrical concrete specimens were exposed to accelerated carbonation. High porosity values were obtained for concrete specimens beyond the expected limits for durable concrete. However, carbonation coefficients related to normal quality concrete were obtained for the lowest water/cement ratio employed suggesting that durable concrete may be obtained with this material despite the high porosity.