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Self-compacting cement-bound pavement foundations for road tunnels: performance assessment in field trials
International Journal of Pavement Engineering ( IF 3.8 ) Pub Date : 2020-10-04 , DOI: 10.1080/10298436.2020.1825709
Ezio Santagata 1 , Eldho Choorackal 1 , Pier Paolo Riviera 1
Affiliation  

ABSTRACT

This paper presents the results of an experimental investigation which was carried out with the purpose of assessing the performance-related properties of self-compacting cement-bound mixtures to be employed in pavement foundations in road tunnels. The mixtures contained a significant quantity of recycled components and function-specific additives. Characteristics of the mixtures, which were produced in a concrete batch plant, were studied by means of laboratory and field tests. Investigated properties included flowability, compressive strength, resilient modulus and bearing capacity. It was found that mixtures prepared with a cement dosage of up to 100 kg/m3 possess the required properties of flowability, strength and stiffness. On the contrary, mixtures with higher cement dosages (150 and 200 kg/m3) fail to meet all the performance-related requirements as a result of their high long-term strength which jeopardises excavatability. Obtained results also highlighted the effects of the different components on the properties of the mixtures and led to the definition of acceptance criteria which can be adopted in actual construction works.



中文翻译:

公路隧道用自密实水泥粘结路面基础:现场试验性能评估

摘要

本文介绍了一项实验研究的结果,该研究旨在评估用于公路隧道路面基础的自密实水泥结合混合物的性能相关特性。这些混合物含有大量的回收成分和特定功能的添加剂。通过实验室和现场测试研究了在混凝土搅拌站中生产的混合物的特性。研究的特性包括流动性、抗压强度、弹性模量和承载能力。发现用高达 100 kg/m 3的水泥用量制备的混合物具有所需的流动性、强度和刚度特性。相反,水泥用量较高的混合物(150 和 200 kg/m3 ) 由于其长期强度高而危及可挖掘性,无法满足所有与性能相关的要求。获得的结果还突出了不同组分对混合物性能的影响,并导致了可在实际建筑工程中采用的验收标准的定义。

更新日期:2020-10-04
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