Narantogtokh, B.; Nishiwaki, T.; Takasugi, F.; Koyama, K.; Lehmann, T.; Jagiello, A.; Droin, F.; Ding, Y. A New Methodology to Estimate the Early-Age Compressive Strength of Concrete before Demolding. Buildings2024, 14, 2099.
Narantogtokh, B.; Nishiwaki, T.; Takasugi, F.; Koyama, K.; Lehmann, T.; Jagiello, A.; Droin, F.; Ding, Y. A New Methodology to Estimate the Early-Age Compressive Strength of Concrete before Demolding. Buildings 2024, 14, 2099.
Narantogtokh, B.; Nishiwaki, T.; Takasugi, F.; Koyama, K.; Lehmann, T.; Jagiello, A.; Droin, F.; Ding, Y. A New Methodology to Estimate the Early-Age Compressive Strength of Concrete before Demolding. Buildings2024, 14, 2099.
Narantogtokh, B.; Nishiwaki, T.; Takasugi, F.; Koyama, K.; Lehmann, T.; Jagiello, A.; Droin, F.; Ding, Y. A New Methodology to Estimate the Early-Age Compressive Strength of Concrete before Demolding. Buildings 2024, 14, 2099.
Abstract
Non-destructive testing has many advantages, such as the ability to obtain a large number of data without destroying existing structures. However, the reliability of the estimation accuracy and the limited range of applicable targets remains an issue. This study proposes to a novel pin penetration test method to determine the early age compressive strength of concrete before demolding. The timing of demolding and initial curing are determined according to the strength development of concrete. Therefore, it is important to determine the compressive strength at the early age before demolding at the actual construction site. The applicability of this strength estimation methodology at actual construction is investigated. Small test holes (12 mm in diameter) are prepared on the mold surface in real construction sites and mock-up specimens in advance. The pin is penetrated into these test holes to obtain the relationship between the compressive strength and the penetration depth. As a result, it is confirmed that the pin penetration test method is suitable to measure the early age compressive strength at actual construction site. This allows the benchmark values for compressive strength, necessary to avoid early frost damage, to be directly verified on the concrete structural members at the construction site. For instance, the compressive strengths of greater than 5 MPa and 10 MPa can be confirmed by the penetration depths benchmark values of 8.0 mm and 6.7mm or less, respectively.
Keywords
Compressive strength estimation; Pin penetration test; non-destructive test; on-site test; Demolding; Early age compressive strength; Cold weather concreting
Subject
Engineering, Architecture, Building and Construction
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
,
*
