Influence of rheological properties of cement mortar on steel fiber distribution in UHPC

Wang, Rui; Gao, Xiaojian; Han, Guangshuai

doi:10.1016/j.conbuildmat.2017.03.173

Cited by 112 publications

(37 citation statements)

References 21 publications

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“…The slump test results of the UHPCs are presented in Table 4. As shown in Table 4, the slump flow of UHPC decreased with decreasing water/binder ratio, which is in line with the results of UHPC made of river sand reported in the literature [40]. The minimum slump flow of UHPC was 570 mm, which still meets the requirements of self-consolidating concrete.…”

Section: Workability Of Uhpcsupporting

confidence: 88%

Mechanical Properties and Environmental Evaluation of Ultra-High-Performance Concrete with Aeolian Sand

Chu

Wang

et al. 2020

Materials

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Ultra-high-performance concrete (UHPC) has received increasing attention in recent years due to its remarkable ductility, durability, and mechanical properties. However, the manufacture of UHPC can cause serious environmental issues. This work addresses the feasibility of using aeolian sand to produce UHPC, and the mix design, environmental impact, and mechanical characterization of UHPC are investigated. We designed the mix proportions of the UHPC according to the modified Andreasen and Andersen particle packing model. We studied the workability, microstructure, porosity, mechanical performance, and environmental impact of UHPC with three different water/binder ratios. The following findings were noted: (1) the compressive strength, flexural strength, and Young’s modulus of the designed UHPC samples were in the ranges of 163.9–207.0 MPa, 18.0–32.2 MPa, and 49.3–58.9 GPa, respectively; (2) the compressive strength, flexural strength, and Young’s modulus of the UHPC increased with a decrease in water/binder ratio and an increase in the steel fibre content; (3) the compressive strength–Young’s modulus correlation of the UHPC could be described by an exponential formula; (4) the environmental impact of UHPC can be improved by decreasing its water/binder ratio. These findings suggest that it is possible to use aeolian sand to manufacture UHPC, and this study promotes the application of aeolian sand for this purpose.

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Section: Workability Of Uhpcsupporting

confidence: 88%

Mechanical Properties and Environmental Evaluation of Ultra-High-Performance Concrete with Aeolian Sand

Chu

Wang

et al. 2020

Materials

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“…The absence of noticeable deterioration in the fiber dispersion even with a large amount of WRA is related to UHPFRC retaining high viscosity for all mixtures. The lowest viscosity measured in this study with the largest amount of WRA was 51.1 Pa s, which is dozens of times higher than the viscosity of normal FRC and several times higher than high viscosity self-compacting concrete (SCC) with steel fibers [40,42]. A much higher amount of cement and a much lower water to cement ratio of UHPFRC induced relatively much higher viscosity even with a large amount of WRA.…”

Section: Fiber Distributionmentioning

confidence: 54%

Effects of Water Reducing Admixture on Rheological Properties, Fiber Distribution, and Mechanical Behavior of UHPFRC

2018

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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.

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“…e above formula indicates that the ratio of the lateral pressure to the axial pressure is half of the confinement index. On combining (14) and (15) with (11), we get…”

Section: Ultimate Bearing Capacitymentioning

confidence: 99%

“…When changing the arrangement of the steel fibers, the current method modifies the UHPC material through the action of an electric field on the steel fibers, thereby improving the tensile properties of the material. For example, Gao [12][13][14][15][16][17] et al designed a directional arrangement for a steel fiber device, which considerably improves the flexural strength of the specimen by controlling the flow direction of the concrete. is kind of device can easily and effectively control the arrangement direction of the steel fiber.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Improving the Compressive Strength of UHPC Turntable

Wang

Sun

2020

Advances in Materials Science and Engineering

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Purpose. In the recent years, horizontal rotation methods have been widely used for bridge construction, particularly for constructing overpass bridges on highways, railways, and shipping. However, bridges constructed using the swivel construction method bear several types of loads during the rotation process. Furthermore, the bridge turntable, which is the core force-bearing component of the structure, bears considerably large vertical pressure and horizontal frictional resistance. The present research proposes three strengthening methods when applying ultrahigh performance concrete (UHPC) materials to the turntable of a spherical hinge to improve structural reliability. Furthermore, the mechanical properties of the structure are evaluated using a unidirectional compressive strength test to provide a theoretical and experimental basis for the application of the UHPC material. Design/Methodology/Approach. To evaluate the mechanical performance of the turntable of a spherical hinge, scale models of six sets of UHPC turntables—steel tube-UHPC, stirrup-UHPC, and directional steel fiber UHPC—were constructed in the study. The compressive strengths of the turntable specimens were calculated after theoretical analysis. After obtaining the load-displacement curves of the cube specimens, the force characteristics of the turntable and the failure mechanism of the structure were analyzed by observing the failure mode of the specimens. Findings. The compressive strength of the steel tube-UHPC turntable was 207 MPa, which can completely replace the traditional steel turntable. In addition, the stirrup-UHPC turntable demonstrated a significant loading effect. However, the effect of the restraint radius of the stirrup needs to be considered during the design; otherwise, the loading effect is poor. Furthermore, a directional steel fiber UHPC turntable can improve the compressive strength to a certain extent. We summarize the failure mechanism of the spherical hinge turntable specimens that are expected to play a role in UHPC spherical hinge in engineering applications and construction monitoring. Originality/Value. To the best of our knowledge, this study is the first to employ the UHPC, steel tube-UHPC, stirrup-UHPC, and directional steel fiber spherical hinge turntables in the swivel construction of bridges. The compressive strength and mechanical characteristics of the UHPC structure meet the requirements of the turntable, and more importantly, the manufacturing process (on-site pouring) of the aforementioned UHPC turntable structures is relatively simple. Finally, the manufacturing cost of the turntables is expected to be reduced by more than 50% compared to those of traditional turntables.

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Influence of rheological properties of cement mortar on steel fiber distribution in UHPC

Cited by 112 publications

References 21 publications

Mechanical Properties and Environmental Evaluation of Ultra-High-Performance Concrete with Aeolian Sand

Mechanical Properties and Environmental Evaluation of Ultra-High-Performance Concrete with Aeolian Sand

Effects of Water Reducing Admixture on Rheological Properties, Fiber Distribution, and Mechanical Behavior of UHPFRC

Experimental Study on Improving the Compressive Strength of UHPC Turntable

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