Influence of concrete cover in the service life of a newly built reinforced concrete structure: a case study
Influence of concrete cover in the service life of a newly built reinforced concrete structure: a case study
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混凝土保护层对新建钢筋混凝土结构使用寿命的影响：案例研究
DOI：
10.1007/s41024-020-0075-3
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
M. Garcez
中科院分区：
文献类型：
--
作者：
Matheus Rocha da Silva;A. B. Rohden;E. Mesquita;M. Garcez
早期土木工程结构的结构倒塌，例如桥梁，隧道和建筑物，可能对世界各地城市的经济问题产生很大影响，这就需要早期纠正性维护和深度干预。在这种背景下，近年来，新的研究和策略集中在钢筋混凝土结构的耐久性已经开发。本案例研究的目的是估计剩余使用寿命的一个新建的钢筋混凝土结构的混凝土保护层的现场测量的基础上，在1662点的柱和板，以评估设计和竣工的结构元素之间可能的分歧的影响。结果表明，当混凝土保护层厚度小于巴西规范规定的最小保护层厚度，水灰比大于巴西规范规定的最大保护层厚度时，柱的53.8%的检测点和密肋板的100%的检测点的使用寿命均小于50年。即使检查点的混凝土保护层高于巴西设计标准的最低要求，剩余使用寿命也不到50年。在临界点处，柱的剩余使用寿命估计为9.5年，而格子板为20年，这远远低于新建钢筋混凝土结构的预期性能。
Structural collapse of civil engineering structures at an early age, as for instance bridges, tunnels and buildings, can present a high impact on economic issues of cities around the world, which emerges the necessity of early corrective maintenance and deep interventions. In this context, recent years, new studies and strategies focused on the durability of reinforced concrete structures have been developed. This case study aims to estimate the residual service life of a newly constructed reinforced concrete structure based on in-situ measurements of concrete cover, performed in 1662 points of columns and slabs to assess the impact of possible divergences between designed and as-built structural elements. Results show that a combination of concrete cover lower than the minimal and water/cement ratio higher than the maximum specified by Brazilian standards resulted in service life under 50 years in 53.8% of the inspected points of columns and 100% of the inspected points of waffle slabs. Even inspected points with concrete cover higher than the minimum requirement of the Brazilian design standard resulted in residual service life under 50 years. In critical points, the estimated residual service life resulted in 9.5 years for columns and 20 years for waffle slabs, which is far below the expected performance for a newly built reinforced concrete structure.