Abstract
This work describes proposed experimental methods for the characterization of concrete in fresh and hardened state, with the purpose of contributing to the experimental characterization of concrete. The main objective was to identify the rheological behavior of high performance (HP) and self-compacting (SC) concretes. Initially, a ordinary concrete composition was proposed, from which, silica fume (5, 10 and 15% in mass) and superplasticizer (0.6% in mass) were added to obtain HPC and SCC. Furthermore, for the self-compacting concretes, a modification in granular skeleton was proposed, with a reduction of total aggregate percentage by 22.73% in relation to the other compositions. The interference of these modifications was evaluated on the behavior of fresh concrete though the flow and slump test and hardened concrete through mechanical properties. The results showed that the modification in the granular skeleton of ordinary concrete contributed directly to the reduction of inertia factors of SCC, favoring the mobility conditions. For both self-compacting and high performance concretes, consistency and mechanical strength gain over ordinary concrete were influenced when the silica fume and superplasticizer concentration was increased, limiting your properties gains to these additions.
Highlights
Concrete’s versatility, ease of execution, freedom in modeling, low cost and mechanical strength makes it one of the most used building materials in the world
The main objective of this research was to identify the rheological behavior of High Performance Concrete (HPC) and Self-Compacting Concrete (SCC)
For HPC and SCC the trend was opposite, resulting in a gain in mechanical strength associated with the greater slump, even when the water/cement ratio was increased
Summary
Concrete’s versatility, ease of execution, freedom in modeling, low cost and mechanical strength makes it one of the most used building materials in the world. The search for increasingly challenging and complex structures that meet high performance parameters, contributes to the growth of studies of different classes of concrete, including Self-Compacting Concrete (SCC) and High Performance Concrete (HPC). HPC presents high strength, durability and workability[1]. Other HPC properties are high density, high modulus of elasticity, resistance to aggressive environmental attacks and low permeability[2]. This composite concrete has been used for different purposes nowadays[3,4,5]. SCC has as main characteristics the absence of the need for compacting and the fluidity required. Resistance to segregation and exudation, are relevant properties in the study of SCC6
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