Water Transport Properties and Depth of Chloride Penetration in Ultra High Performance Concrete

Abstract

Properties of water transport and depth of chloride penetration into the Ultra High Performance Concrete (hereafter as UHPC) with mild steel fibres are presented in this paper. The main aim of this experimental part of work is to obtain sufficiently accurate input data for the evaluation of long-term durability of architectural concrete which are connected with water transport and its accompanying effects such as biological degradation or chloride transport. The article also presents the one dimensional chloride diffusion into UHPC which can be potentially dangerous particularly for durability of reinforced concrete structures. For the simulation of aggressive environments the concrete samples were exposed to chloride solution for one year. Measured data were examined in relation to the depth of penetration of chloride ions into the UHPC structure. Comparative measurements with normal strength concrete (hereafter as NSC) are done as well. An about five-time lower value of moisture absorption of UHPC compared to the NSC was observed and further the curve of chloride penetration into the structure is significantly steeper for UHPC samples.

Ultra-High-Performance Concrete (UHPC): A State-of-the-Art Review

“…A study found that the pores have an average diameter less than 5 nm and the volume of the pores is between 1% and 2% of the total volume of the pores in UHPC [73]. It has been found that the water absorption coefficient of UHPC after 90 days is approximately five times lower than that of control concrete [74]. An analysis of one study revealed an average water penetration height and a relative seepage height of 7.2 and 2.2 × 10 −8 mm, respectively, as determined by a single pressure method [75].…”

Study on Frost Resistance and Interface Bonding Performance through the Integration of Recycled Brick Powder in Ultra-High-Performance Concrete for Structural Reinforcement

“…Moreover, UHPC has an outstandingly high compressive strength, making it highly valuable for various construction applications. The minimum compressive strength of UHPC has been reported to be between 160 and 180 MPa [11,12], rendering it highly valu-able for various construction applications, particularly in maintenance and reinforcement engineering [13][14][15].…”

Optimisation and Prediction of Fresh Ultra-High-Performance Concrete Properties Enhanced with Nanosilica

“…Since it was invented, UHPC is characterised by a very high compressive strength exceeding 150 MPa and other improved mechanical properties, such as tensile strength, flexural strength, ductility, and impact resistance (de Larrard and Sedran 1994; Yoo and Banthia 2016). In addition, UHPC exhibits favourable behaviour, such as high modulus of elasticity, low creep and shrinkage deformations, and high durability against different exposure conditions, namely, chloride ion penetration resistance and reinforcement corrosion resistance under extreme exposure conditions (Graybeal 2006;Dobias et al 2016;Hassan 2018;Xie et al 2018;Fan et al 2019;Radhi et al 2021). These exceptional properties can generally be achieved using the following approaches.…”