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Effect of coarse aggregate type on chloride ion penetration in concrete
Construction and Building Materials ( IF 7.4 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.conbuildmat.2018.01.090
Hani H. Titi , Habib Tabatabai

Long-term durability and sustainability of crucial infrastructure systems such as bridges and pavements are of utmost importance for the economic health of any society. Understanding factors that affect long-term deterioration of reinforced concrete structures can help enhance durability and sustainability of these systems. This paper investigates the effect of the type of coarse aggregate used in concrete on chloride ions penetrability. Twelve coarse aggregate types of different geologic formations (sedimentary, igneous, and metamorphic) were used to prepare fresh concrete in which silica fume and class C fly ash were used. All mix parameters including gradation and volumes of different aggregates were held constant in different mixes with the only variable being the aggregate type. The Rapid Chloride Penetration Tests were conducted on concrete specimens made with various aggregate types at ages of 28, 56, 91 and 365 days. Analysis of test results showed that the aggregate type as well as aggregate absorption rates have significant influence on the electrical charges passed through concrete, especially in early ages of concrete containing aggregates with sedimentary rock origin and relatively high absorption. These specimens exhibited the highest RCPT results indicating higher capacity to allow chloride ion penetration when compared to specimens with igneous and metamorphic rock aggregate of lower absorption values. This influence (discrepancy) diminishes with time for both aggregate type and absorption rates in terms of the magnitude of measured total charge passed.



中文翻译:

粗集料类型对混凝土中氯离子渗透的影响。

关键基础设施系统(例如桥梁和人行道)的长期耐久性和可持续性对于任何社会的经济健康至关重要。了解影响钢筋混凝土结构长期劣化的因素可以帮助增强这些系统的耐久性和可持续性。本文研究了混凝土中使用的粗骨料类型对氯离子渗透性的影响。使用十二种粗骨料类型的不同地质构造(沉积,火成和变质)来制备新鲜混凝土,其中使用了硅粉和C级粉煤灰。所有混合参数(包括不同骨料的等级和体积)在不同混合中均保持恒定,唯一的变量是骨料类型。快速氯化物渗透测试是针对28、56、91和365天龄的各种骨料类型的混凝土样品进行的。测试结果分析表明,骨料类型和骨料吸收率对通过混凝土的电荷有显着影响,特别是在含有沉积岩起源和相对较高吸收率的骨料的混凝土早期。与具有较低吸收值的火成岩和变质岩石聚集体的标本相比,这些标本表现出最高的RCPT结果,表明其允许氯离子渗透的能力更高。对于聚集体类型和吸收速率而言,这种影响(偏差)随时间的推移而减小,这取决于所测得的通过的总电荷量。56、91和365天。测试结果分析表明,骨料类型和骨料吸收率对通过混凝土的电荷有显着影响,特别是在含有沉积岩起源和相对较高吸收率的骨料的混凝土早期。与具有较低吸收值的火成岩和变质岩石聚集体的标本相比,这些标本表现出最高的RCPT结果,表明其允许氯离子渗透的能力更高。对于聚集体类型和吸收速率而言,这种影响(偏差)随时间的推移而减小,这取决于所测得的通过的总电荷量。56、91和365天。测试结果分析表明,骨料类型和骨料吸收率对通过混凝土的电荷有显着影响,特别是在含有沉积岩起源和相对较高吸收率的骨料的混凝土早期。与具有较低吸收值的火成岩和变质岩石聚集体的标本相比,这些标本表现出最高的RCPT结果,表明其允许氯离子渗透的能力更高。对于聚集体类型和吸收速率而言,这种影响(偏差)随时间的推移而减小,这取决于所测得的通过的总电荷量。测试结果分析表明,骨料类型和骨料吸收率对通过混凝土的电荷有显着影响,特别是在含有沉积岩起源和相对较高吸收率的骨料的混凝土早期。与具有较低吸收值的火成岩和变质岩石聚集体的标本相比,这些标本表现出最高的RCPT结果,表明其允许氯离子渗透的能力更高。对于聚集体类型和吸收速率而言,这种影响(偏差)随时间的推移而减小,这取决于所测得的通过的总电荷量。测试结果分析表明,骨料类型和骨料吸收率对通过混凝土的电荷有显着影响,特别是在含有沉积岩起源和相对较高吸收率的骨料的混凝土早期。与具有较低吸收值的火成岩和变质岩石聚集体的标本相比,这些标本表现出最高的RCPT结果,表明其允许氯离子渗透的能力更高。对于聚集体类型和吸收速率而言,这种影响(偏差)随时间的推移而减小,这取决于所测得的通过的总电荷量。与具有较低吸收值的火成岩和变质岩石聚集体的标本相比,这些标本表现出最高的RCPT结果,表明其允许氯离子渗透的能力更高。对于聚集体类型和吸收速率而言,这种影响(偏差)随时间的推移而减小,这取决于所测得的通过的总电荷量。与具有较低吸收值的火成岩和变质岩石聚集体的标本相比,这些标本表现出最高的RCPT结果,表明其允许氯离子渗透的能力更高。对于聚集体类型和吸收速率而言,这种影响(偏差)随时间的推移而减小,这取决于所测得的通过的总电荷量。

更新日期:2018-02-01
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