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利用再生骨料混凝土进行黄河下游护坡工程建设的可行性

Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River.

作者信息

Feng Pan, Chang Honglei, Xu Guodong, Liu Qiaoling, Jin Zuquan, Liu Jian

机构信息

School of Material Science and Engineering, Southeast University, Nanjing 211189, China.

School of Qilu Transportation, Shandong University, Jinan 250002, China.

出版信息

Materials (Basel). 2019 Dec 17;12(24):4237. doi: 10.3390/ma12244237.

DOI:10.3390/ma12244237
PMID:31861189
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6947320/
Abstract

To explore the feasibility of utilizing recycled aggregate concrete (RAC) in revetment construction of the lower Yellow River, a series of mix proportions with local recycled aggregates (RA) were designed to evaluate its mechanical properties and durability. The morphology and micro-hardness of the interface transition zone (ITZ) were also characterized to explain the performance of RAC. Based on the compressive strength data of 13 groups of mixtures, which is larger than 30 MPa, and with the RA substitution rate not less than 50%, the RAC containing 50% recycled fine aggregate (RFA) (HDX50), 70% RFA (HDX70), and 50% recycled coarse aggregate (RCA) (HDC50) were selected. The experiment results suggest that the mechanical performance, frost resistance, and carbonation resistance of the selected RAC is generally poorer than that of natural aggregate concrete (NAC), but can meet the performance requirement of concrete for the revetment construction of the lower Yellow River. The comprehensive performance of these three mixtures ranks as: HDX50 > HDX70 > HDC50. When considering the RA substitution ratio as a priority, HDX70 would be the best choice and can be applied in the revetment engineering. A number of defects are observed on the surface of RA with old pastes attached. Furthermore, the ITZs formed around RA are loose and with low micro-hardness, which is deemed to be the dominating reasons leading to the weaker performance of RAC than that of NAC.

摘要

为探究再生骨料混凝土（RAC）用于黄河下游护岸工程建设的可行性，设计了一系列采用当地再生骨料（RA）的配合比，以评估其力学性能和耐久性。还对界面过渡区（ITZ）的形态和显微硬度进行了表征，以解释RAC的性能。基于13组强度大于30MPa且再生骨料替代率不低于50%的混合物的抗压强度数据，选取了含50%再生细骨料（RFA）的RAC（HDX50）、70%RFA的RAC（HDX70）和50%再生粗骨料（RCA）的RAC（HDC50）。试验结果表明，所选RAC的力学性能、抗冻性和抗碳化性总体上比天然骨料混凝土（NAC）差，但能满足黄河下游护岸工程混凝土的性能要求。这三种混合物的综合性能排序为：HDX50＞HDX70＞HDC50。若优先考虑再生骨料替代率，HDX70将是最佳选择，可应用于护岸工程。观察到附着有旧浆体的RA表面存在一些缺陷。此外，RA周围形成的ITZ疏松且显微硬度低，这被认为是导致RAC性能比NAC弱的主要原因。

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本文引用的文献

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The Effect of a High Amount of Micro-Fillers on the Long-Term Properties of Concrete.大量微填料对混凝土长期性能的影响
Materials (Basel). 2019 Oct 18;12(20):3421. doi: 10.3390/ma12203421.
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Effectiveness of Fiber Reinforcement on the Mechanical Properties and Shrinkage Cracking of Recycled Fine Aggregate Concrete.纤维增强对再生细骨料混凝土力学性能和收缩开裂的影响
Materials (Basel). 2016 Feb 26;9(3):131. doi: 10.3390/ma9030131.
Materials (Basel). 2020 May 21;13(10):2373. doi: 10.3390/ma13102373.