Экспериментальное исследование балок из самоуплотняющегося бетона с наноразмерными добавками

Gehan A. Hamdy; Hossam Eldin H. Ahmed; Asmaa Y. Y. Barakat; Mostafa A. Mostafa

doi:10.22213/2410-9304-2019-3-20-32

Authors

G. A. Hamdy Benha University
H. E. H. Ahmed Civil Engineering Department, Faculty of Engineering at Shoubra, Benha University
A. Y. Y. Barakat National Water Research Center
M. A. Mostafa National Water Research Center

DOI:

https://doi.org/10.22213/2410-9304-2019-3-20-32

Keywords:

Self-compacting concrete, additives, Nano-silica, Nano-manganese ferrite, fresh properties, beams, flexure, durability

Abstract

Self-compacting concrete (SSC) is a concrete that flows and consolidates under its own weight without additional compaction; it has special mix design which provides high flow ability and high segregation resistance. This paper presents an experimental program that investigates the structural behavior of SCC beams with additives of Nano-silica (Nano-SiO₂) and Nano manganese ferrite (Nano-MnFe₃O₄). Ten SCC mixes were prepared containing Nano-SiO₂ additives with three percentages 1%, 2% and 3% of cement weight, and Nano-MnFe₃O₄ with percentages 0.3%, 0.5% and 0.7%. Laboratory tests were performed to determine the fresh properties (workability, passing ability and segregation resistance), mechanical properties (compressive strength, splitting tensile strength and flexural strength), and durability (water permeability and chloride penetration). The experimental results show that using Nano additives with 25% cement replacement by fly ash improved the mechanical and durability properties of SCC. Mixes with the optimum percentage were used to cast reinforced concrete beams which were tested in bending until failure in order to investigate the effect of Nano materials additives on the flexural performance.

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