Rheological properties of ultra-high-performance concrete — An overview

Khayat, Kamal H.; Meng, Weina; Vallurupalli, Kavya; Teng, Lin

doi:10.1016/j.cemconres.2019.105828

Cited by 207 publications

(54 citation statements)

References 137 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Much work has been done to tailor the architecture of the plasticiser to the characteristics of precursors. For example, Khayat et al [136] explained that two different PCEs are required for PCsilica fume blends to give preferential adsorption onto each precursor. Plank et al [128] stated that blended cements with low PC content require polymers with a high ratio of side chains.…”

Section: Surface Chemistry and Plasticising Admixturesmentioning

confidence: 99%

A Roadmap for Production of Cement and Concrete with Low-CO2 Emissions

Deventer

White

Myers

2020

Waste Biomass Valor

View full text Add to dashboard Cite

This review will show that low-CO2 cements can be produced to give superior durability, based on a sound understanding of their microstructure and how it impacts macro-engineering properties. For example, it is essential that aluminium is available in calcium-rich alkali-activated systems to offset the depolymerisation effect of alkali cations on C-(N)-A-S-H gel. The upper limit on alkali cation incorporation into a gel greatly affects mix design and source material selection. A high substitution of cement clinker in low-CO2 cements may result in a reduction of pH buffering capacity, hence susceptibility to carbonation and corrosion of steel reinforcement. With careful mix design, a more refined pore structure and associated lower permeability can still give a highly durable concrete. It is essential to expand thermodynamic databases for current and prospective cementitious materials so that concrete performance and durability can be predicted when using low-CO2 binders. Cationic copolymer and amphoteric plasticisers, when available commercially, will enhance the development of alkali-activated materials. The development of supersonic shockwave reactors will enable the conversion of a wide range of virgin and secondary source materials into cementitious materials, replacing blast furnace slag and coal fly ash that have dwindling supply. A major obstacle to the commercial adoption of low-CO2 concrete is the prescriptive nature of existing standards and design codes, so there is an urgent need to shift towards performance-based standards. The roadmap presented here is not an extension of current cement practice, but a new way of integrating fundamental research, equipment innovation, and commercial opportunity.

show abstract

Section: Surface Chemistry and Plasticising Admixturesmentioning

confidence: 99%

A Roadmap for Production of Cement and Concrete with Low-CO2 Emissions

Deventer

White

Myers

2020

Waste Biomass Valor

View full text Add to dashboard Cite

show abstract

“…For example, it has strong resistance to water permeability, chloride penetration, freeze and thaw, and chemical attack because of its great material properties. Comprehensive studies on UHPC have been conducted for the last few decades such as the rheological properties of a fresh paste of UHPC [ 15 , 16 , 17 , 18 , 19 , 20 ], the effect of fibers [ 16 , 19 , 21 , 22 , 23 ], mix design [ 24 , 25 , 26 , 27 , 28 , 29 ], and structural applications [ 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

The Role of Supplementary Cementitious Materials (SCMs) in Ultra High Performance Concrete (UHPC): A Review

Park

Liu

et al. 2021

Materials

View full text Add to dashboard Cite

Although ultra high-performance concrete (UHPC) has great performance in strength and durability, it has a disadvantage in the environmental aspect; it contains a large amount of cement that is responsible for a high amount of CO2 emissions from UHPC. Supplementary cementitious materials (SCMs), industrial by-products or naturally occurring materials can help relieve the environmental burden by reducing the amount of cement in UHPC. This paper reviews the effect of SCMs on the properties of UHPC in the aspects of material properties and environmental impacts. It was found that various kinds of SCMs have been used in UHPC in the literature and they can be classified as slag, fly ash, limestone powder, metakaolin, and others. The effects of each SCM are discussed mainly on the early age compressive strength, the late age compressive strength, the workability, and the shrinkage of UHPC. It can be concluded that various forms of SCMs were successfully applied to UHPC possessing the material requirement of UHPC such as compressive strength. Finally, the analysis on the environmental impact of the UHPC mix designs with the SCMs is provided using embodied CO2 generated during the material production.

show abstract

“…Because ilmenite mud waste contains some amounts of unleached TiO 2 the concrete containing this waste might also have a photocatalytic effect helping to reduce the NOx level in the air [ 19 , 20 ]. The waste probably contains also some amount of nano silica particles which might affect the rheology of cement paste [ 21 , 22 ]. There are two main ways of making a concrete resistant for frost attack.…”

Section: Introductionmentioning

confidence: 99%

Ilmenite Mud Waste as an Additive for Frost Resistance in Sustainable Concrete

Chyliński

Kuczyński

2020

Materials

View full text Add to dashboard Cite

Sustainable development leads to the production of building materials that are safer for the environment. One of the ways to achieve sustainability in materials is the addition of industrial wastes and by-products, especially to concrete. However, the addition of waste to concrete often decreases its durability and the scope of aggression of the environment in which the concrete is used has to be reduced. Making sustainable concrete, which is also durable in more aggressive environments, is rather difficult. This article presents the results of tests performed on concrete containing ilmenite mud waste from the production of titanium dioxide, which was exposed to frost aggression with and without de-icing salts. The results have shown that a sustainable and frost resistant concrete can be made. After 200 freeze–thaw cycles, the compressive strength of the tested concretes decreased by less than 4%. Concretes were highly resistant for scaling and after 112 freeze–thaw cycles in water with de-icing salt, the scaled mass was less than 0.02 kg/m2. The air void distribution has also been analyzed. The results suited the requirements for frost resistance concrete and were similar to those obtained for a reference concrete with fly ash. The examination of the microstructure using scanning electron microscopy (SEM) has not shown any potential risks that might affect the durability of concrete. Particles of waste were thoroughly combined in the binder and some of its constituents seem to be an active part of the cement matrix. Long-term tests of shrinkage (360 days) have not shown any excessive values that would differ from the reference concrete with fly ash. The presented results have shown that sustainable concrete containing ilmenite mud waste from the production of titanium dioxide might also be resistant to frost aggression.

show abstract

Rheological properties of ultra-high-performance concrete — An overview

Cited by 207 publications

References 137 publications

A Roadmap for Production of Cement and Concrete with Low-CO2 Emissions

A Roadmap for Production of Cement and Concrete with Low-CO2 Emissions

The Role of Supplementary Cementitious Materials (SCMs) in Ultra High Performance Concrete (UHPC): A Review

Ilmenite Mud Waste as an Additive for Frost Resistance in Sustainable Concrete

Contact Info

Product

Resources

About