Characterization of coarse aggregate morphology and its effect on rheological and mechanical properties of fresh concrete

Zhao, Yu; Duan, Yihang; Zhu, Lingli; Wang, You-Kai; Jin, Zhenghao

doi:10.1016/j.conbuildmat.2021.122940

Cited by 33 publications

(23 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the D/d ratio, Zhao et al (2021) [ 153 ] evaluated the influence of three coarse aggregate geometry on the mechanical properties of HPC. The authors used lamellar, irregular, and rounded aggregates.…”

Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

103

View full text Add to dashboard Cite

This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

show abstract

Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

103

View full text Add to dashboard Cite

show abstract

“…The smart phone controls the rheometer through Bluetooth interface. It has been confirmed that the behavior of fresh concrete is similar to Bingham fluid (Equation ( 1)), where τ (Pa) is the shear stress, τ 0 (Pa) is the yield stress, and η (Pa•s) is the plastic viscosity [38][39][40][41]. The corresponding relationship can be expressed by Equation (2), where g (Nm) and H (Ns) are flow resistance and torque viscosity respectively, which are called relative yield stress and relative plastic viscosity [42,43].…”

Section: Measurement Of Rheological Properties Of Wet Shotcretementioning

confidence: 75%

“…It can be seen from Figure 16 that the effect of water-reducing agent on wet shotcrete with silica fume is not obvious, because after adding water reducer, the slump cannot reach a large slump, and the slump value is less than 5 cm. It has been reported in the previous literature [35,38,66] that the high specific surface area of silica fume adsorbs water-reducing agent molecules and reduces the water-reducing effect. Air content decreases with the increase of silica fume content.…”

Section: Effect Of Silica Fumementioning

confidence: 99%

Influence of Mix Proportions on Rheological Properties, Air Content of Wet Shotcrete—A Case Study

et al. 2021

View full text Add to dashboard Cite

To study the influence of different mix proportions on the fresh properties of wet shotcrete, the rheological properties and air content of wet shotcrete with different admixtures before pumping were measured. In addition, the pressure drop along the pipeline and the build-up thickness were studied, and the relationship between the rheological properties and the pumpability and sprayability was discussed. This paper attempts to reveal the influence mechanism of admixtures on the fluidity of wet shotcrete by means of pictures. The results show that free paste effect and ball effect are two key factors that affect the performance of fresh wet shotcrete. Air-entraining agent and fly ash are commonly used admixtures, which improve the pumping performance and spraying performance. Finally, the mix proportions of wet shotcrete are put forward to meet the requirements of different types of shotcrete.

show abstract

“…The difference between those two grading curves lies is the higher amount of nes for BC gradings. Other studies observed either no impact of elongation on yield stress [5] or an increasing yield stress with increasing amount of elongated particles [14] which is attributed to the thinner binder layer between particles. The reason for the decreasing yield stress with increasing number of elongated particles could be the difference in packing when lling mortar into the measurement cell.…”

Section: Yield Stressmentioning

confidence: 89%

Impact of particle shape of crushed natural and recycled fine aggregate on fresh and hardened mortar properties

Burgmann,

Breit

2023

Preprint

View full text Add to dashboard Cite

Increasing the amount of crushed natural and recycled fine aggregate in mortar and concrete can help reduce the depletion of resources and increase the recycling rate of construction and demolition waste. Differences in particle shape and angularity influence fresh and hardened mortar and concrete properties. Here a multiple linear regression analysis is performed to investigate the impact of particle shape and angularity on rheological and strength properties of mortar. Shape and angularity are quantified by micro computed tomography. Mortar mixtures with five different materials and varying other mix design parameters like water to cement ratio, binder to aggregate ratio and shape of grading curve are produced. Results indicate that particle shape and angularity have a complex impact on fresh and hardened mortar properties that often interact with other mix design parameters. Careful composition of the aggregate fraction with respect to shape and angularity is necessary to maintain sufficient mortar properties.

show abstract

Characterization of coarse aggregate morphology and its effect on rheological and mechanical properties of fresh concrete

Cited by 33 publications

References 17 publications

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Influence of Mix Proportions on Rheological Properties, Air Content of Wet Shotcrete—A Case Study

Impact of particle shape of crushed natural and recycled fine aggregate on fresh and hardened mortar properties

Contact Info

Product

Resources

About