Increasing the Length of Concrete Pavement Slabs Using Shrinkage Reducing Admixture and Polypropylene Fiber

IF 3.6 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Concrete Structures and Materials Pub Date : 2024-02-06 DOI:10.1186/s40069-023-00647-8

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引用次数: 0

Abstract

Pavement engineers frequently employ concrete pavements because of their benefits such as extended lifetime, superior performance and durability, and so on. However, there are some disadvantages of these pavements such as shrinkage which may lead to cracking, warping, and limiting the length of the concrete pavement slabs. Shrinkage reducing admixture (SRA) and polypropylene fibers can be employed to prevent or control shrinkage cracking. In this study, increasing the length of concrete pavement slabs using shrinkage reducing admixture and polypropylene fiber was investigated. For mix compositions, two water–cement ratios of 0.35 and 0.4 were employed, and the percentages of SRA and polypropylene fiber utilized in mixes were 2% and 1% by weight of cement, respectively. Slump, compressive strength, third point flexural strength, electrical resistance, free and restrained shrinkage tests were carried out as the experimental programming to investigate the effect of these materials on concrete behavior and evaluate the amount of concrete pavement design parameters. Statistical analysis and RSM were used to determine the significance of each parameter and their interactions on concrete properties. It was observed that the use of SRA had no influence on workability; however, polypropylene fibers reduced the slump flow of concrete. Also, the use of SRA resulted in a decrease in mechanical properties. In addition, the use of polypropylene fibers considerably enhanced the energy absorption of concrete. Furthermore, on concrete containing SRA and polypropylene fiber, the magnitude of free and restrained shrinkage and crack width were reduced. Finally, the length and thickness of concrete pavement slabs were evaluated using the experimental results on the Tehran-Shomal freeway as a case study. The slab length could be increased by about 20% without any significant change in the slab thickness using SRA and polypropylene fiber in concrete mix composition. This can lead to an increase in construction speed, improve the durability of pavement and generally increase the quality of the concrete pavement.

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使用减缩外加剂和聚丙烯纤维增加混凝土路面板的长度

摘要混凝土路面具有使用寿命长、性能优越、经久耐用等优点，因此路面工程师经常采用混凝土路面。然而，这些路面也有一些缺点，如收缩可能导致开裂、翘曲和限制混凝土路面板的长度。可采用减少收缩外加剂（SRA）和聚丙烯纤维来防止或控制收缩开裂。本研究调查了使用减缩外加剂和聚丙烯纤维增加混凝土路面板长度的情况。在混合料成分方面，采用了 0.35 和 0.4 两种水灰比，SRA 和聚丙烯纤维在混合料中的使用比例分别为水泥重量的 2% 和 1%。通过坍落度、抗压强度、第三点抗折强度、电阻、自由收缩和约束收缩试验，研究了这些材料对混凝土行为的影响，并评估了混凝土路面设计参数的用量。统计分析和 RSM 被用来确定每个参数及其相互作用对混凝土性能的影响。结果表明，使用 SRA 对工作性没有影响；但聚丙烯纤维降低了混凝土的坍落度。此外，SRA 的使用还导致力学性能下降。此外，聚丙烯纤维的使用大大提高了混凝土的能量吸收能力。此外，在含有 SRA 和聚丙烯纤维的混凝土中，自由收缩和约束收缩的幅度以及裂缝宽度都有所减小。最后，以德黑兰至肖马尔高速公路的实验结果为例，对混凝土路面板的长度和厚度进行了评估。在混凝土混合成分中使用 SRA 和聚丙烯纤维，可将板的长度增加约 20%，而板的厚度无明显变化。这可以提高施工速度，改善路面的耐久性，并普遍提高混凝土路面的质量。

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来源期刊

International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

6.30

自引率

5.90%

发文量

审稿时长

13 weeks

期刊介绍： The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.