Plastic viscosity of cement mortar with manufactured sand as influenced by geometric features and particle size

Ren, Qiang; Tao, Yaxin; Jiao, Dengwu; Jiang, Zhengwu; Ye, Guang; Schutter, Geert De

doi:10.1016/j.cemconcomp.2021.104163

Cited by 43 publications

(16 citation statements)

References 66 publications

(76 reference statements)

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“…Since then, numerous studies have been launched along this line. Denoting the average water film thickness (AWFT) as the ratio of excess water (in excess of the amount needed to fill up the voids between solid particles) to solid surface area, it has been proven that the AWFT is the major parameter affecting the fresh behaviours of plain CBM without fibres [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Modelling of Fresh Behaviours of Basalt Fibre-Reinforced Mortar Based on Average Water Film Thickness and Fibre Factor

Zeng³

et al. 2023

Materials

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Though previous studies have indicated that the fresh behaviours of plain mortar/concrete are mainly governed by the average water film thickness (AWFT), whether the concept of AWFT is also applicable to fibrous mortar/concrete still needs to be explored. Furthermore, for fibrous mortar/concrete, it is obvious that the fibres added also have certain effects on the fresh behaviours. In two previous studies on basalt fibre-reinforced mortar (BFRM), the integral effects of the AWFT and fibre dosage as well as the integral effects of the AWFT and fibre length were individually investigated. In this study, a fibre factor (FF) defined as the fibre volume multiplied by the fibre aspect ratio was employed and 24 extra mortar groups were tested. A total of 68 mortar groups were applied in numerical analysis. The results of the regression analysis yielded good correlations of the workability, fluidity, cohesiveness, and adhesiveness of BFRM with the AWFT and FF, suggesting that the AWFT and FF are together the governing parameters controlling the fresh behaviours of BFRM. Hence, the AWFT and FF may be used to develop a model for the fresh properties of BFRM.

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Section: Introductionmentioning

confidence: 99%

Experimental Study and Modelling of Fresh Behaviours of Basalt Fibre-Reinforced Mortar Based on Average Water Film Thickness and Fibre Factor

Zeng³

et al. 2023

Materials

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“…Particle shape in general is known to have a decisive in uence on rheological and strength properties. Several researchers observe an increase in plastic viscosity and yield stress if more angular and less spherical crushed aggregates are used instead of rounded natural aggregates [5][6][7][8][9][10]. Besides rheological quantities common measures like slump and slump ow are also in uenced by particle shape properties.…”

Section: Introductionmentioning

confidence: 99%

“…With a constant amount of mortar available the mortar layer between particles decreases due to the increased amount necessary to cover each particle [49]. This could lead to more collisions between particles [7,8,10]. In addition friction between angular and rough particles as well as particles and the binder matrix is higher than in the case of rounded particles [7].…”

mentioning

confidence: 99%

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

Burgmann,

Breit

2023

Preprint

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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.

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“…PV is a Bingham plastic model parameter that represents the slope of the shear stress/shear rate line above the yield point [ 30 ]. PV is a crucial rheological property that influences the parameters of drilling fluid [ 31 ]. However, experimentally and computationally, the yield stress is associated with common field-friendly measuring methods, such as the slump and slump flow test, for evaluating flowability [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Predicting the Rheological Properties of Super-Plasticized Concrete Using Modeling Techniques

et al. 2022

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Interface yield stress (YS) and plastic viscosity (PV) have a significant impact on the pumpability of concrete mixes. This study is based on the application of predictive machine learning (PML) techniques to forecast the rheological properties of fresh concrete. The artificial neural network (NN) and random forest (R-F) PML approaches were introduced to anticipate the PV and YS of concrete. In comparison, the R-F model outperforms the NN model by giving the coefficient of determination (R2) values equal to 0.92 and 0.96 for PV and YS, respectively. In contrast, the model’s legitimacy was also verified by applying statistical checks and a k-fold cross validation approach. The mean absolute error, mean square error, and root mean square error values for R-F models by investigating the YS were noted as 30.36 Pa, 1141.76 Pa, and 33.79 Pa, respectively. Similarly, for the PV, these values were noted as 3.52 Pa·s, 16.48 Pa·s, and 4.06 Pa·s, respectively. However, by comparing these values with the NN’s model, they were found to be higher, which also gives confirmation of R-F’s high precision in terms of predicting the outcomes. A validation approach known as k-fold cross validation was also introduced to authenticate the precision of employed models. Moreover, the influence of the input parameters was also investigated with regard to predictions of PV and YS. The proposed study will be beneficial for the researchers and construction industries in terms of saving time, effort, and cost of a project.

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Plastic viscosity of cement mortar with manufactured sand as influenced by geometric features and particle size

Cited by 43 publications

References 66 publications

Experimental Study and Modelling of Fresh Behaviours of Basalt Fibre-Reinforced Mortar Based on Average Water Film Thickness and Fibre Factor

Experimental Study and Modelling of Fresh Behaviours of Basalt Fibre-Reinforced Mortar Based on Average Water Film Thickness and Fibre Factor

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

Predicting the Rheological Properties of Super-Plasticized Concrete Using Modeling Techniques

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