A framework for information recovery of cementitious materials under long-term use

Abstract

The lifetime of concrete and concrete structure is significantly longer compared to the ordinary industrial materials and products. During the lifecycle stages, various stakeholders take place and makes interventions to the structures. It is important to store all information necessary for such interventions. This information includes design documents and construction records at newly construction as well as the remedial activity records at the use stage. Although the importance of such information storage is emphasized in many studies and recommendations, the loss of such information is frequently observed for the concrete structures after long term use. Even the most basic information related to concrete material design, such as water-to-cement ratio, is frequently lost after long-term use of the concrete structures.Therefore, the framework and method to recover materials information is necessary to appropriately operate and maintain the structure for the long-term period. This paper presents a novel framework for realizing such information recovery of cementitious material using the multi-dimensional data-driven approach. First, the essence and advantage of obtaining the multi-dimensional data in comparison with single value approach was presented. First, different dependency of AC impedance |Z| and theta at different measurement frequencies was compared and use of this tendency for information recovery was discussed. Second, the accuracy of water-to-cement ratio estimation using the proposed system was compared between different available information. The proposed system exhibited some consistent estimation even when all information is not available, and exhibited good estimation accuracy when age is assumed known.