Petrological assessment of drying shrinkage of sedimentary rock used as aggregates for concrete
Petrological assessment of drying shrinkage of sedimentary rock used as aggregates for concrete
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DOI：
10.1016/j.matdes.2021.109922
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发表时间：
2021-06
影响因子：
8.4
通讯作者：
Y. Kawabata;M. Yahata;S. Hirono
中科院分区：
文献类型：
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作者：
Y. Kawabata;M. Yahata;S. Hirono
不同的沉积岩作为混凝土骨料，主要是砂岩，干燥收缩的岩石学特征和水蒸气吸附的基础上进行评估。集料的干缩与其蚀变和变质类型有关，尤其与其组成矿物的种类和含量以及晶体间的孔隙空间有关。集料的干燥收缩率与水蒸气解吸率呈正相关。当直径为4-20 nm的孔的体积减少时，干燥收缩和水蒸气吸附急剧减少。在砂岩骨料的情况下，在蚀变的早期阶段，骨料的干燥收缩是大的，而随着蚀变和变质过程的进展，它减小。次生A型白云母的存在表明这些过程之间的过渡阶段，这是一个重要的岩石学特征，在评估骨料收缩。这些结果清楚地表明，从沉积到现在，地温梯度和挤压强度的差异表现为蚀变和变质类型，具有不同的孔隙分布。骨料的干燥收缩和水蒸气吸附反映了这些岩石学特征和由此产生的孔隙分布。
The drying shrinkage of different sedimentary rocks used as aggregates for concrete, mainly sandstone, is evaluated on the basis of petrological characterization and water vapor sorption. The drying shrinkage of aggregates is dependent on their alteration and metamorphic types, and is especially influenced by the types and contents of their constituent minerals and pore spaces between the crystals. There was a positive correlation between drying shrinkage of aggregates and water vapor desorption. When the volume of pores 4–20 nm in diameter was reduced, drying shrinkage and water vapor sorption were drastically reduced. In the case of sandstone aggregates, drying shrinkage of the aggregate is large in the early stage of alteration while it decreases with the progress of alteration and metamorphism processes. The presence of secondary type-A muscovite indicates a transitional stage between these processes, which is an important petrological feature in evaluating aggregate shrinkage. These results clearly show that differences in geothermal gradient and compression intensity from the time of deposition to the present manifested as the alteration and metamorphic types, with divergent pore distributions. The drying shrinkage and the water vapor sorption of aggregates reflect these petrological characteristics and resultant pore distributions.