Optimized design of ultra-high performance concrete (UHPC) with a high wet packing density

Wang, Xinpeng; Yu, Rui; Song, Qiulei; Shui, Zhonghe; Liu, Zhen; Wu, Shuo; Hou, Dongshuai

doi:10.1016/j.cemconres.2019.105921

Cited by 185 publications

(28 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, straight steel fibres (SSF) with 13 mm length and 0.22 mm diameter are utilized in the UHPC. The UHPC mixtures are designed by using the modified Andreasen and Andersen model (A&A) model in according to the most closely packed principle [5,35]. The distribution coefficient (q) may be used to determine the proportions of fine and coarse particles in the mixture, of which the value is selected as 0.23 based on the available literature [36,37].…”

Section: Methodsmentioning

confidence: 99%

“…It is observed that the slump flows of UHPC mixtures with 0%, 10%,15%, and 20% SSP are 610, 610, 605, and 600 mm, respectively. This is attributed to the fact that, when the SSP is used as supplementary cementitious materials (SCMs) in UHPC, it decreases the stress state between particles, aggregate and mortar, and therefore results in slight reduction of the slump flow [35]. In addition, the specific surface area of SSP is higher than that of cement, resulting in water demand increase, which also reduce the slump flow.…”

Section: Slump Flowmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Steel Slag Powder and Expansive Agent on the Properties of Ultra-High Performance Concrete (UHPC): Based on a Case Study

Cheng

et al. 2020

Materials

View full text Add to dashboard Cite

In view of the performance requirements of mass ultra-high performance concrete (UHPC) for the Pang Gong bridge steel cable tower in China, the UHPC incorporating of steel slag powder and hybrid expansive agents is optimized and prepared. The effects of steel slag powder and hybrid expansive agents on the hydration characteristics and persistent shrinkage of UHPC are investigated. The results indicate that 15 wt.% steel slag powder and 5 wt.% hybrid expansive agents can effectively reduce the drying shrinkage deformation of UHPC with a slight decrease of strength. Heat flow calorimetry results show that the incorporation of steel slag powder and expansive agents decreases the hydration heat at three days. Moreover, the obtained adiabatic temperature rise of UHPC is 59.5 °C and the total shrinkage value at 180 days is 286 με. The hydration heat release changes of large volume UHPC in the steel-concrete section of cable tower is agreed with the result of adiabatic temperature rise in the laboratory.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Slump Flowmentioning

confidence: 99%

Effects of Steel Slag Powder and Expansive Agent on the Properties of Ultra-High Performance Concrete (UHPC): Based on a Case Study

Cheng

et al. 2020

Materials

View full text Add to dashboard Cite

show abstract

“…7. This can be attributed to paste-rich UHPC's high superplasticizer dosage which tends to entrain air bubbles [26,27].…”

Section: Ct-scan Analysesmentioning

confidence: 99%

Elephant skin formation on UHPC surface: Effects of climatic condition and blast furnace slag content

Yalçınkaya

Çopuroğlu

2021

Construction and Building Materials

View full text Add to dashboard Cite

h i g h l i g h t sElephant skin formation can be seen on the casting surface of UHPC under any drying conditions. Elephant skin hampers the evacuation of air bubbles and results in a marked change in pore profile. A condition that triggers vapor condensation on the casting surface eliminates the elephant skin. Partial replacement of Portland cement with GGBS cannot eliminate the skinning phenomenon.

show abstract

“…UHPC is an almost ideally brittle material with a very dense and high-strength structure. The outstanding mechanical properties are achieved by an optimization on the basis of the maximum packing density theory [ 1 , 2 ] and a very low water to cement ratio (w/c). A high amount of cement, fillers (quartz or limestone powder), and pozzolanic additives such as silica fume lead to the optimized particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete

et al. 2021

View full text Add to dashboard Cite

In view of the growing demand for sustainable and lightweight concrete structures, the use of ultra-high-performance concrete (UHPC) is becoming increasingly important. However, fatigue loads occur more frequently in nature than static loads. Despite the impressive mechanical properties of UHPC, a reduced tolerance for cyclic loading is known. For this reason, our paper deals with experimental and numerical investigations regarding the main causes for crack initiation on the meso, micro, and nanoscale. After mechanical fatigue tests, we use both scanning (SEM) and transmission electron microscopy (TEM) to characterize microstructural changes. A new rheological model was developed to apply those changes to the mesoscopic scale. The origins of fatigue damaging can be traced back to a transformation of nanoscale ettringite, resulting in a densification of the surrounding binder matrix. Additionally, a higher content of unhydrated cement clinker in the matrix benefits fatigue resistance. On the mesoscale, stress peaks around aggregate grains expand into the surrounding binder with increasing load cycles and lead to higher degradation.

show abstract

Optimized design of ultra-high performance concrete (UHPC) with a high wet packing density

Cited by 185 publications

References 42 publications

Effects of Steel Slag Powder and Expansive Agent on the Properties of Ultra-High Performance Concrete (UHPC): Based on a Case Study

Effects of Steel Slag Powder and Expansive Agent on the Properties of Ultra-High Performance Concrete (UHPC): Based on a Case Study

Elephant skin formation on UHPC surface: Effects of climatic condition and blast furnace slag content

Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete

Contact Info

Product

Resources

About