Design of binder system of eco-efficient UHPC based on physical packing and chemical effect optimization

Shi, Ye; Long, Guangcheng; Zen, Xiaohui; Xie, Youjun; Tao-ping, Shang

doi:10.1016/j.conbuildmat.2020.121382

Cited by 42 publications

(10 citation statements)

References 44 publications

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“…As shown in Table 4 , the solid concentrations of the UHPC matrix designed in this study reached 78.40%, and the solid concentration can be further improved by decreasing the W/C and increasing the A/C [ 29 ]. In the available literature, the maximum solid concentration of the UHPC matrix designed ranged from 75.8% to 83.2% [ 9 , 29 , 30 ], which demonstrated the validity of the design method proposed for UHPC with a high solid concentration.…”

Section: Design Of the Uhpc Based On The Modified Fuller Distribution...mentioning

confidence: 97%

Composition Design and Fundamental Properties of Ultra-High-Performance Concrete Based on a Modified Fuller Distribution Model

Xie

Fan²,

Guo³

et al. 2023

Materials

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Both the discrete and continuous particle packing models are used to design UHPC, but the influences of a water film covering the particle surfaces on the compactness of the particle system were not considered in previous research. In fact, the water film results in a certain distance between solid particles (DSP), which affects the compactness of the particle system, especially for cementitious materials with small particle sizes. In the present study, the mixture design method for UHPC was proposed based on the Fuller distribution model modified using the DSP. Then, the components of cementitious materials and aggregates were optimized, and the UHPC matrices with high solid concentrations were obtained. The results showed that the solid concentration, slump flow, and compressive strength of the UHPC matrix reached 77.1 vol.%, 810 mm, and 162.0 MPa, respectively. By replacing granulated blast furnace slag (GBFS) with quartz powder (QP), the flexural strength of the UHPC matrix was increased without reducing its compressive strength. When the steel fiber with a volume fraction of 1.5% was used, the slump flow, compressive strength, tensile strength, and flexural strength of the UHPC reached 740 mm, 175.6 MPa, 9.7 MPa, and 22.8 MPa, respectively. After 500 freeze–thaw cycles or 60 dry–wet cycles under sulfate erosion, the mechanical properties did not deteriorate. The chloride diffusion coefficients in UHPCs were lower than 3.0 × 10−14 m2/s, and the carbonation depth of each UHPC was 0 mm after carbonization for 28 days. The UHPCs presented ideal workability, mechanical properties, and durability, demonstrating the validity of the method proposed for UHPC design.

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Section: Design Of the Uhpc Based On The Modified Fuller Distribution...mentioning

confidence: 97%

Composition Design and Fundamental Properties of Ultra-High-Performance Concrete Based on a Modified Fuller Distribution Model

Xie

Fan²,

Guo³

et al. 2023

Materials

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“…The sieving results of three different grades of quartz sand are shown in Table 2 . Furthermore, the mixture proportions of the eco-friendly UHPC matrix can be designed according to the method proposed in the previous study [ 7 , 32 ] and are listed in Table 3 . The design approach of the binder system for eco-efficient UHPC is to achieve a densely compacted hardened paste by optimizing the physical packing and chemical effect of the binder system.…”

Section: Brief Description Of the Experimental Testmentioning

confidence: 99%

Discrete Element Simulation of the Relationship between Composition, ITZ Property, and Tensile Behavior of Eco-Friendly UHPC Matrix

Zhou,

Shi,

et al. 2023

Materials

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To combat global warming, the development of eco-friendly ultra-high performance concrete (UHPC) has become one of the current research hotspots. Understanding the relationship between composition and performance of eco-friendly UHPC from a meso-mechanical point will be of great significance in proposing a more scientific and effective mix design theory. In this paper, the 3D discrete element model (DEM) of an eco-friendly UHPC matrix was constructed. The mechanism of the effect of the interface transition zone (ITZ) properties on the tensile behavior of an eco-friendly UHPC matrix was studied. The relationship between composition, ITZ property, and tensile behavior of eco-friendly UHPC matrix was analyzed. The results show that ITZ strength influences the tensile strength and cracking behavior of eco-friendly UHPC matrix. The effect of ITZ on the tensile properties of eco-friendly UHPC matrix is more significant than that of normal concrete. The tensile strength of UHPC will be increased by 48% when the ITZ property is changed from normal condition to perfect. Improving the reactivity of the binder system of UHPC will improve the performance of ITZ. The cement content in UHPC was reduced from 80% to 35%, and the σITZ/σPaste was reduced from 0.7 to 0.32. Both nanomaterials and chemical activators can promote the hydration reaction of the binder material, which in turn leads to better ITZ strength and tensile properties for an eco-friendly UHPC matrix.

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“…Then, the specimens were placed in a drying chamber at 25 °C and 50% humidity. The length changes of the specimens after specified time of drying (4,11,18,25,32 and 46 days of storage) were recorded according to the above ASTM standard. The mean drying shrinkage values of the specimens were calculated based on the results of three specimens.…”

Section: Autogenous and Drying Shrinkagesmentioning

confidence: 99%

“…One typical concrete of using the former design concept is the ultra high-performance concrete (UHPC). A number of investigations [1][2][3][4][5] have tried to improve the properties of UHPC by means of increasing its packing density. The higher packing density generally gives rise to good compaction of the constitutes and results in a low porosity matrix [2,5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new simplified method for calculating short-term and long-term consolidation settlements of multi-layered soils considering creep limit

Chen

Feng

Yin

2021

Computers and Geotechnics

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Design of binder system of eco-efficient UHPC based on physical packing and chemical effect optimization

Cited by 42 publications

References 44 publications

Composition Design and Fundamental Properties of Ultra-High-Performance Concrete Based on a Modified Fuller Distribution Model

Composition Design and Fundamental Properties of Ultra-High-Performance Concrete Based on a Modified Fuller Distribution Model

Discrete Element Simulation of the Relationship between Composition, ITZ Property, and Tensile Behavior of Eco-Friendly UHPC Matrix

A new simplified method for calculating short-term and long-term consolidation settlements of multi-layered soils considering creep limit

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