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首页> 外文期刊>Journal of green building >EFFECT OF RECYCLED CONCRETE AGGREGATE, AIR ENTRAINING ADMIXTURE AND MAXIMUM AGGREGATE PARTICLE SIZE ON THE BEHAVIOR OF CONCRETE UNDER FREEZE-THAW CYCLES
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EFFECT OF RECYCLED CONCRETE AGGREGATE, AIR ENTRAINING ADMIXTURE AND MAXIMUM AGGREGATE PARTICLE SIZE ON THE BEHAVIOR OF CONCRETE UNDER FREEZE-THAW CYCLES

机译：再生混凝土骨料，空气夹带混合物和最大骨料粒度对冻融循环下混凝土行为的影响

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摘要

This article presents freeze-thaw (F/T) resistance of concrete containing recycledconcrete aggregate (RCA). RCA percentages of 15%, 30%, 45%, and 60% werereplaced by natural aggregate. Air entraining admixture (AEA) with three differentratios (0.06%, 0.13%, and 0.20%) were used and three different maximum aggregateparticle sizes (d_(max) = 16 mm, 22.4 mm and 31.5 mm) were selected. F/T resistancesof the concretes were determined through the measurement of scaling on the surfacesof the samples placed in 3% NaCl solution in pursuance of TS CEN/TS 12390-9.It was observed that the compressive strength of the concretes decreased by 20% onaverage compared to the control samples with the increase in the amount of RCA.However, it was determined from the experiments that the use of RCA increases theF/T resistances of the concretes as it provides extra voids in the concrete and decreasescapillary permeability. Within the limits of this study, d_(max) = 22.4 mm, RCA = 45%and AEA = 0.13% are recommended as the optimum values for F/T resistance ofthe concrete. It is also recommended to use RCA in pavement applications includingroadways, highways, parking facilities, and other non-structural concrete elementssubjected to severe winter conditions.
机译：本文介绍了含有再生混凝土的冻融（F / T）电阻混凝土骨料（RCA）。 RCA百分比为15％，30％，45％和60％由天然骨料取代。空气夹带混合物（AEA）三种不同使用比率（0.06％，0.13％和0.20％）和三种不同的最大骨料选择粒度（D_（MAX）= 16mm，22.4mm和31.5 mm）。 F / T电阻通过测量表面上的缩放来确定混凝土在3％NaCl溶液中放置在3％NaCl溶液中，以追求TS CEN / TS 12390-9。观察到，混凝土的抗压强度降低了20％与对照样品相比的平均值，随着RCA的量增加。然而，从实验中确定了使用RCA增加的实验混凝土中的F / T电阻在混凝土中提供额外的空隙并降低毛细血管渗透性。在本研究的范围内，D_（MAX）= 22.4 mm，RCA = 45％AEA = 0.13％，建议作为F / T电阻的最佳值混凝土。还建议使用RCA在路面应用中，包括道路，高速公路，停车设施等非结构混凝土元件受到严重的冬季条件。

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