Abstract
Concrete is a basic building material. This article describes its properties. Microcracks result from volume changes in concrete. The intensity of temperature development and the way concrete is being cured have a significant influence on the emergence of microcracks. Indeed, the quantification of microcracks isn't simple. Using acoustic emissions it is possible to observe the evolution of scratches in hardening concrete - how many of them evolve and how the intensity of their emergence changes depending on different regimes of curing or different types of concrete (different cement batches, various additives and admixtures, etc.).
Highlights
High Performance Concrete (HPC) can be defined as a concrete made with appropriate materials combined according to a selected mix design and properly mixed, transported, placed, consolidated, and cured to provide excellent performance in some specific areas of the properties of concrete, such as high compressive strength and high durability
While for usual concrete drying shrinkage is the main component of total shrinkage, in the case of HPC the role of autogenous shrinkage increases
Temperature measurement during concrete setting was made with thermal resistors NTC K164NK022
Summary
High Performance Concrete (HPC) can be defined as a concrete made with appropriate materials (super-plasticizer, retarder, fly ash, blast furnace slag and silica fume) combined according to a selected mix design and properly mixed, transported, placed, consolidated, and cured to provide excellent performance in some specific areas of the properties of concrete, such as high compressive strength and high durability (high density, low permeability, and good resistance to certain forms of attack). During hydration concrete obtains strength and other mechanical properties but it shrinks. While for usual concrete drying shrinkage is the main component of total shrinkage, in the case of HPC the role of autogenous shrinkage increases. The shrinkage affects the creation of micro-cracks which lower the durability of the concrete. The course of total volume exchange is affected by temperature development, see Figure 1
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
