Understanding the porous aggregates carrier effect on reducing autogenous shrinkage of Ultra-High Performance Concrete (UHPC) based on response surface method

Sun, Yu; Yu, Rui; Shui, Zhonghe; Wang, Xinpeng; Qian, Diao; Rao, B.D.V. Chandra Mohan; Huang, Jie; He, Yongjia

doi:10.1016/j.conbuildmat.2019.06.151

Cited by 99 publications

(15 citation statements)

References 39 publications

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“…It has been reported that the incorporation of calcium-sulfoaluminates-CaO based expansive agent (CSA-CaO EA) could effectively reduce autogenous shrinkage of UHPC by over 20% and show a better contribution to shrinkage compensation [32]. A study indicated that the addition of 7.5% EA and 1% shrinkage-reducing agent reduced the shrinkage by approximately 80% after 1 day [33]. At present, the ettringite based EA has been utilized to reduce the autogenous shrinkage and drying shrinkage of UHPC, but the addition of EA may reduce the workability of fresh concrete, increase the air content and decrease the strengths [34].…”

Section: Introductionmentioning

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

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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.

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Section: Introductionmentioning

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

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“…It was acknowledged that the hydration reaction could be negatively affected by the reduction in both pores and fluid alkalinity, yielding a reduced CS of the concrete at early ages [ 41 ]. In addition, the cement hydration process can be delayed because a low pH can obstruct microstructure development in the cement pastes at early ages [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Effective Microorganism Solution and High Volume of Fly Ash Blended Sustainable Bio-Concrete

2022

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Currently, the production of sustainable concrete with high strength, durability, and fewer environmental problems has become a priority of concrete industries worldwide. Based on this fact, the effective microorganism (EM) solution was included in the concrete mixtures to modify the engineering properties. Concrete specimens prepared with 50% fly ash (FA) as an ordinary Portland cement (OPC) replacement were considered as the control sample. The influence of EM solution inclusion (at various contents of 0, 5, 10, 15, 20, and 25% weight) in the cement matrix as water replacement was examined to determine the optimum ratio that can enhance the early and late strength of the proposed bio-concrete. The compressive strength, porosity, carbonation depth, resistance to sulphuric acid attack, and the environmental benefits of the prepared bio-concrete were evaluated. The results showed that the mechanical properties and durability performance of the bio-concrete were improved due to the addition of EM and FA. Furthermore, the inclusion of 10% EM could increase the compressive strength of the bio-concrete at 3 (early) and 28 days by 42.5% and 14.6%, respectively. The durability performance revealed a similar trend wherein the addition of 50% FA and 10% EM into the bio-concrete could improve its resistance against acid attack by 35.1% compared to the control specimen. The concrete mix designed with 10% EM was discerned to be optimum, with approximately 49.3% lower carbon dioxide emission compared to traditional cement.

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“…33 Because the production of lightweight aggregates requires high temperature, lightweight aggregates have more internal pores than ordinary aggregates. [34][35][36] The use of porous aggregates 37 reduced the autogenous shrinkage of UHPC without sacrificing its workability and strength properties. Kaarthika 38 produced lightweight concrete with expanded clay and improved the compressive strength by 39%.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on mechanical property and microstructure of ultra‐high‐performance concrete with ceramsite sand

Zhou

Long

Chaktrimongkol

et al. 2021

Structural Concrete

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As one of the most innovative cement‐based materials, the properties of ultra‐high‐performance concrete (UHPC) have been widely investigated. This paper experimentally studies the effect of ceramsite sand on the properties and microstructure of UHPC to develop a new UHPC with low apparent density. The effects of the volume ratio of ceramsite sand and steel fiber content on the properties of UHPC were also studied. Various experiments, including apparent density, compressive and flexural strength, and microstructural properties were conducted on UHPC with different mixing parameters. The results showed that the addition of 18% ceramsite sand effectively improved the mechanical strength, specific strength, and pore structure as well as the interfacial transition zone of UHPC. Steel fiber and ceramsite sand worked together to make up for the lack of lightweight porous aggregate so that even when 100% ceramsite sand was used to prepare UHPC, the compressive strength of concrete could still exceed 100 MPa, and had a lower apparent density than normal UHPC.

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Understanding the porous aggregates carrier effect on reducing autogenous shrinkage of Ultra-High Performance Concrete (UHPC) based on response surface method

Cited by 99 publications

References 39 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

Effective Microorganism Solution and High Volume of Fly Ash Blended Sustainable Bio-Concrete

Experimental investigation on mechanical property and microstructure of ultra‐high‐performance concrete with ceramsite sand

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