THE INFLUENCE OF MINERAL ADDITIVES ON THE PROPERTIES OF ULTRA-HIGH STRENGTH CONCRETE
DOI:
https://doi.org/10.31650/2786-6696-2023-5-110-116Keywords:
ultra-high strength concrete, microsilica, superzeolite, polycarboxylate superplasticizer, strength, structure formation, cost-effective design.Abstract
The article presents the results of a study of the influence of highly active mineral additives on the physical and mechanical properties of ultra-high strength concrete. Currently, according to the classical concept of making ultra-high strength concrete, a significant amount of ultradispersed microsilica is introduced, which determines the increased cost of its preparation. In order to obtain cost-effective ultra-high-strength concrete, the composition of mixtures was evaluated according to the criteria of strength and economy by replacing microsilica with technologically optimized highly dispersed zeolite (SSA=1200 m2/kg), which belongs to the class of superzeolite. It is shown that for modified concrete with the addition of microsilica, the compressive strength after 2 days is 88.8 MPa, after 28 days ‒ 161.0 MPa. When microsilica is partially replaced by superzeolite, sufficiently high mechanical parameters are achieved: after 2 days the compressive strength is 75.8 MPa, after 28 days the strength increases by 2.1 times and is 163.2 MPa, in this case a flexural strength of 12.1 MPa is achieved. The microsilica has a positive effect due to increased reactivity, especially at an early age. Similarly, the fine fraction of superzeolite is characterized by the acceleration of the pozzolanic reaction, while the coarser fraction contributes to increasing the degree of hydration of the Portland cement due to the desorption of water molecules from micropores and provides internal care for concrete. The cementitious matrix is compacted by filling the intergranular space due to the formation of nanodispersed C-S-H phases. Thermal analysis showed that the amount of calcium hydroxide in the superzeolite cementitious system is 2.75% or 66 kg/m3, which meets the requirements for ultra-high strength concrete. The synergistic combination of microsilica and superzeolite with high surface activity and polycarboxylate superplasticizer provides high packing density and the necessary strength characteristics of ultra-high strength concretes, as well as contributes to their cost-efficiency, which opens the prerequisites for a large-scale engineering application of such concrete in construction.References
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