Abstract
The rheological properties of ultra-high-performance fiber-reinforced concrete (UHPFRC) according to the amount of water reducing admixture (WRA) and their effects on the fiber distribution and the tensile performance of UHPFRC were investigated. Four types of mixtures with a high compressive strength over 150 MPa were designed according to the amount of WRA and the flowability, rheological properties, compressive strength, flexural performance, and fiber distribution were measured. Test results showed that the amount of WRA influences both the freshly mixed and hardened properties. It was also revealed that the flexural strength has a strong correlation with rheological properties, compressive strength, and fiber distribution.
Highlights
Concrete and other cement-based materials are widely used as construction materials due to their remarkable economic efficiency and durability [1,2,3,4]
This paper presents an experimental and analytical study on the effects of the amount of water reducing admixture (WRA) on the rheological properties of ultra-high-performance fiber-reinforced concrete (UHPFRC) and the relationship between the rheological properties, fiber distribution, and mechanical behavior of UHPFRC
The flowability and rheological properties were measured for the fresh UHPFRC, and the results revealed that the positive effect of increasing the amount of WRA on the flowability as well as the rheological properties of fresh UHPFRC could be achieved only with an amount less than a threshold, and a higher amount of WRA exceeding the threshold contributed little to improving the flowability and the rheological properties
Summary
Concrete and other cement-based materials are widely used as construction materials due to their remarkable economic efficiency and durability [1,2,3,4] They are prone to cracking due to their low tensile strength and low strain capacity at fracture, and the inherently brittle nature may cause unexpected failure at the ultimate state. Among various kinds of SFRCs developed to date, ultra-high-performance fiber-reinforced concrete (UHPFRC) exhibits excellent mechanical performance [10,11,12,13] It has extremely high compressive strength over 150 MPa with a very low water-to-binder ratio as well as excellent toughness and energy absorption capacity by adding less than 2 vol% of steel fibers [14,15,16,17,18]
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