The effect and optimization of mineral additives in ultra high performance concrete (Uhpc) produced by taguchi method

Recently time, Ultra-High Performance Concrete (UYPB) has been one of the most active research fields of concrete because it can contribute to the longer life and economic efficiency of structures. Some advanced civil engineering design facilities, including high-rise buildings and nuclear power plants, are constructed keeping in view the high probability of events causing extreme loading like a missile attack or an aircraft impact mainly because if their structures fail, there would be severe consequences. UYPB is a concrete material with high over (150MPa) compressive strength. It is very durable, and it exhibits toughness and ductility for meeting the specific needs. In this study, the methods of studying the impact and design of various materials and their proportions on the UYPB properties. Several UYPB mixtures have been developed by using the Taguchi method. It is part of the experimental programs for evaluating the properties of UYPB. The mixture proportions of component materials were decided according to the approximate ranges mentioned in the literature which are: sand to binder ratios = 1, Water to binder ratio = 0.19, PE to binder ratio = 3.5%, Pozzolanic (silica fume, fly ash and slag) to binder ratio = (0, 10, 15, 20)% and steel fiber =1% by volume. To do that, a program of 468 specimens (40x40x160mm) has been prepared for the tests, were processed cured under two different regimes, including the normal immersion water curing at 23 ± 2°C until 3, 7, and 28 days of the test, and immersion hot water curing at 65°C for 24 hours, after which, it was added to the normal water, and cured for 28 days. The properties of both hardened and fresh concrete have been assessed. We conducted the flow test for testing fresh concrete to get indicate the workability, and standard test to assess density (unit weight). For investigating the sample of hardened concrete, we conducted compressive strength, flexural strength, fire resistance tests and determining (density, absorption, and voids). The results obtained in UYPB, Taguchi analysis for compressive strength at 28 days was found (20% silica fume, 0% fly ash and 0% slag) and flexural strength was (10% silica fume, 0% fly ash and 0% slag). The compressive strength was found 147.07 MPa in (SC) and 150.13 MPa in (HC) and flexural strength was 26.88 MPa in (SC) and 27.31MPa in (HC) were reached in a mixture (S10G10).