Abstract
Theoretically, high-performance concrete with w/c ratio about 0.30 and w/b about 0.28 should have low porosity, low water permeability and high strength. The purpose of this study was to examine the influence of the superplasticizers( with and without air-entraining effect) and shrinkage reducing admixture based on a high molecular weight basis alcohol amount on the air-content, compressive strength, shrink and resistance to water penetration of high-performance self-compacting concrete (HPSCC). The test results have shown that despite the low water content, concrete modified with inadequately selected SP and high amount of SRA has a high porosity and low strength and water permeability. The types of superplasticizers and amount of SRA are significant due to porosity parameters, compressive strength and water-permeability of HPSCC. The water permeability and compressive strength of HPSCC depending on the effects of amount of SRA admixtures on the volume of pores in HPSCC. Moreover, shrinkage of incidental air-entrained concrete, despite its lower endurance, after 28 days of hardening it is smaller than non-aerated concrete.
Highlights
Many concrete properties, not directly referred to in the EN 206 concrete standard, are specified and used in practice to assess the durability of cement composites
In Phase 1, tests were carried out on fresh high-performance self-compacting concrete with a different type of SPs and different amount of shrinkage reducing admixtures (SRA) based on a high molecular weight basis alcohol
Shrinkage of incidental air-entrained concrete despite its lower endurance it is smaller than non-aerated concrete
Summary
Not directly referred to in the EN 206 concrete standard, are specified and used in practice to assess the durability of cement composites. These properties include water resistance, frost resistance, shrinkage, resistance to chemical corrosion. The paper presents the development of high-performance self-compacting concrete (HPSCC) with two different types of PCE superplasticizers The main objective of the research is to determine the influence of admixtures on the rheological aspect, air-content in the fresh concrete mixture, porosity characteristics, compressive strength and resistance to water penetration of HPSCC
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