期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 79, 期 -, 页码 357-369出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.12.038
关键词
Sprayed concrete; Maturity method; Control method; Compressive strength; Evolution of temperature
资金
- Universitat Politecnica de Catalunya
- Collegi d'Enginyers de Camins, Canals i Ports de Catalunya
The maturity method provides a simple approach for assessing the strength evolution of concrete. Although it is already used in the precast industry, no reported applications with sprayed concrete may be found in the literature. Such concrete presents singular characteristics due to the spraying process and, in some cases, due to the introduction of accelerators that modify the kinetics of cement hydration. Consequently, the traditional equations that relate the evolution of mechanical properties and the maturity index might not apply in this case. The objective of this study is to adapt the maturity method to sprayed concrete. An experimental program was conducted with 24 concrete mixes sprayed in laboratory and tested for the evolution of temperature and compressive strength. An alternative equation was proposed to relate the maturity index and the mechanical properties. Subsequently, finite element models were developed to generalize the maturity curves considering the local design parameters. (C) 2015 Elsevier Ltd. All rights reserved.
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