New development of ultra-high-performance concrete (UHPC)

Du, Jiang; Meng, Weina; Khayat, Kamal H.; Bao, Yi; Guo, Pengwei; Lyu, Zhenghua; Abu-Obeidah, Adi; Nassif, Hani; Wang, Hao

doi:10.1016/j.compositesb.2021.109220

Cited by 332 publications

(76 citation statements)

References 219 publications

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“…In this case, the compressive strength after 28 days should be at least 120 MPa. Ultra-high performance concretes are also used in structures subjected to various types of force effects, including dynamic and shock [3].…”

Section: And 1041 Mpa) It Has Been Established That the Complex Combination Of Portland Cement With Superzeolite Corundum Aggregate Basalmentioning

confidence: 99%

Development of rapid-hardening ultra-high strength cementitious composites using superzeolite and N-C-S-H-PCE alkaline nanomodifier

Sanytsky

Kropyvnytska

Нeviuk

et al. 2021

EEJET

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It is shown that high operational reliability of structural materials, in particular at high temperatures, is achieved through the use of ultra-high strength cement composites. Studies of various types of Portland cements with mineral additives of the CEM II/A type have established that a stone based on Portland cement with superzeolite is the most resistant to high temperatures. It has been proven that due to the "self-autoclaving" effect, the strength of a stone based on CEM II/A-P 42.5 R is 1.2–1.3 times higher than a stone based on other types of CEM II/A. To obtain fast-hardening cement composites, a nanotechnological approach based on the use of sol-gel technology has been implemented. Using the methods of IR spectroscopy, electron microscopy, the fact of obtaining, by the chemical method of synthesis, an alkaline nanomodifier N-C-S-H-PCE, which is a nano–liquid based on nano-core seeds of sodium/calcium hydrosilicates, has been proved. It has been confirmed that the introduction of the alkaline nanomodifier N-C-S-H-PCE provides a significant intensification of the early structure formation processes in the paste based on Portland cement with superzeolite (after 12 hours, 24 hours and 28 days, the strength is 16.9; 30.5 and 104.1 MPa). It has been established that the complex combination of Portland cement with superzeolite, corundum aggregate, basalt fiber and alkaline nanomodifier provides rapid-hardening of ultra-high strength cement composites (T=400 °C) with improved operational properties. Thus, there is reason to assert the feasibility of developing rapid-hardening ultra-high strength cementitious composites. This solves the problems associated with the need to increase their early strength and performance. As a result, it is possible to carry out repair work to protect equipment from abrasive wear at elevated temperatures

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Section: And 1041 Mpa) It Has Been Established That the Complex Combination Of Portland Cement With Superzeolite Corundum Aggregate Basalmentioning

confidence: 99%

Development of rapid-hardening ultra-high strength cementitious composites using superzeolite and N-C-S-H-PCE alkaline nanomodifier

Sanytsky

Kropyvnytska

Нeviuk

et al. 2021

EEJET

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“…Furthermore, incorporating microfibers into the UHPC matrix significantly enhances its flexural strength, ductility, and toughness [6][7][8]. Fiber inclusion can restrain the coalescence, growth, and propagation of microcracks and thus, mitigate brittle fractures [9][10][11]. Additionally, fibers increase the toughness energy owing to the crack bridging effect [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Polymers on Behavior of Ultra-High-Strength Concrete

et al. 2022

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The development of ultra-high-performance concrete (UHPC) is still practically limited due to the scarcity of robust mixture designs and sustainable sources of local constituent materials. This study investigates the engineering characteristics of Styrene Butadiene Rubber (SBR) polymeric fiber-reinforced UHPC with partial substitution of cement at 0, 5 and 20 wt.% with latex polymer under steam and air curing techniques. The compressive and tensile strengths along with capillary water absorption and sulfate resistance were measured to evaluate the mechanical and durability properties. Scanning Electron Microscopy (SEM) was carried out to explore the microstructure development and hydration products in the designed mixtures under different curing regimes. The results indicated that the mixtures incorporating 20 wt.% SBR polymer achieved superior compressive strength at later ages. Additionally, the tensile strength of the polymeric UHPC without steel fibers and with 20% polymers was enhanced by 50%, which promotes the development of novel UHPC mixtures in which steel fibers could be partially replaced by polymer, while enhancing the tensile properties.

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“…Within the advanced construction materials, the advantages of UHPC are remarkable and, thus, have drawn the attention of researchers and engineers [ 9 ]. UHPC has nearly three times the strength of normal concrete and high constructability, and it has been applied in the structural joint, bridge deck, or even the entire pedestrian bridge [ 10 , 11 , 12 , 13 ]. However, since they are mixed from different material components, the physicochemical properties of UHPC are quite different from normal construction materials, and the common construction characteristics remain to be investigated, especially the early age shrinkage behavior [ 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Early Age Shrinkage and Mechanical Effect of Ultra-High-Performance Concrete Composite Deck: A Case Study with In Situ Test and Numerical Simulation

Cao

et al. 2022

Materials

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For the Honghe Bridge project located in Yunnan Province, Southwest China, a steel/ultrahigh-performance concrete (UHPC) composite deck is used in the suspension bridge with a 700 m main span, and the steel stud connectors are used in the 50 mm–thick UHPC layer. To investigate the shrinkage behavior of UHPC and the relevant influence, the in situ time-dependent strain is measured continuously, and within the 20-day curing time, the material behavior is summarized based on test results. This paper proposes a prediction model for UHPC shrinkage which is refined from the widely used B3 model for normal concrete material, and the parameter values are modified and optimized by experimental comparison. Combining the numerical model and the finite element analysis model of the composite deck, the detailed mechanical state in structural parts is studied. For the practical construction, the simulation results indicate that the small thickness of UHPC above the stud and weak bond strength can influence the eventual structural performance greatly. In the discussion of stress distribution at different locations of the deck, the potential crack on the edge and the corner of the UHPC–steel interface and the mechanical damage on the stud connector around are also indicated.

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New development of ultra-high-performance concrete (UHPC)

Cited by 332 publications

References 219 publications

Development of rapid-hardening ultra-high strength cementitious composites using superzeolite and N-C-S-H-PCE alkaline nanomodifier

Development of rapid-hardening ultra-high strength cementitious composites using superzeolite and N-C-S-H-PCE alkaline nanomodifier

Effect of Polymers on Behavior of Ultra-High-Strength Concrete

Early Age Shrinkage and Mechanical Effect of Ultra-High-Performance Concrete Composite Deck: A Case Study with In Situ Test and Numerical Simulation

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