Rheological behavior of Portland cement pastes and self-compacting concretes containing porcelain polishing residue

Matos, Paulo Ricardo de; Oliveira, A. L.; Pelisser, Fernando; Prudêncio, Luiz Roberto

doi:10.1016/j.conbuildmat.2018.04.212

Cited by 50 publications

(24 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The loss in fresh density and workability is probably due to the higher angularity degree of the WFS in contrast to the smooth profile of the quartz sand employed as the fine aggregate [2,8]. Moreover, the large specific surface area of fine bentonite and pulverized coal particles causes them to absorb water and reduce the workability of normal-strength concrete as the WFS replacement level increases [43]. On the other hand, Portland cement hydration in conventional concrete can be enhanced by adding fine bentonite and pulverized coal particles [16].…”

Section: Compressive Strengthmentioning

confidence: 99%

Mechanical Properties of Ultra-High Performance Concrete with Partial Utilization of Waste Foundry Sand

Smarzewski

2020

Buildings

View full text Add to dashboard Cite

Waste foundry sand (WFS) is a ferrous and non-ferrous foundry industry by-product, produced in the amount of approximately 700 thousand tons annually in Poland and it is estimated that only a small percentage of this waste is recycled. The study used WFS to produce ultra-high performance concrete (UHPC) as a partial substitute for quartz sand. It was replaced with WFS levels of 0%, 5%, 10%, and 15% by weight of quartz sand content. The UHPC mixtures were produced and tested to determine the compressive strength, flexural strength, splitting tensile strength as well as the modulus of elasticity at 28, 56, and 112 days. Scanning electron microscope (SEM) analysis was done to identify the presence of various compounds and micro-cracks in UHPC with WFS. The results revealed an increase as well as an insignificant decrease in the mechanical properties up to 5% and 10% WFS replacement, respectively. These studies also prove improvement in the microstructure of UHPC up to a 5% WFS level. In all the tested properties in this work, 5% WFS was found to be an apt substitute for quartz sand.

show abstract

Section: Compressive Strengthmentioning

confidence: 99%

Mechanical Properties of Ultra-High Performance Concrete with Partial Utilization of Waste Foundry Sand

Smarzewski

2020

Buildings

View full text Add to dashboard Cite

show abstract

“…The samples were prepared in a 600-ml capacity mixer at 750 rpm. The mixing procedure was based on [30] and consisted of the following steps: (1) the amounts of deionized water and cement + SCM (when present) to produce 100 ml of paste were added to the mixer container and manually homogenized for 1 min; (2) the sample was mixed at 750 rpm for 1 min; (3) the mixer was stopped and the material accumulated in the impeller and the wall of the container was scraped down; (4) the sample was mixed for another minute at 750 rpm.…”

Section: Sample Preparationmentioning

confidence: 99%

“…However, the vane-in-cup set is often used to evaluate pasty materials such as cement pastes [17,38,43,44] because the material sheared in the gap of the geometry is sheared by the material that is trapped between the blades itself, potentially avoiding wall slip [45,46]. Initially, the samples were pre-sheared at 100 s −1 for 60 s. Then, the flow curves were obtained by increasing the shear rate from 0.1 to 100 s −1 in 12 steps (0.1, 2.5, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 s −1 ), and subsequently decreasing to 0.1 s −1 in the same steps [30]. Each step was maintained for 30 s to achieve a steady-state flow, as seen in Fig.…”

Section: Dynamic Yield Stressmentioning

confidence: 99%

Comparison between methods for determining the yield stress of cement pastes

Matos

Pilar

Casagrande

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

The determination of the yield stress (τ 0) of cement-based materials is of great interest for engineering applications, since it accurately describes the flow behavior and assesses empirical properties related to its workability, such as the slump of concretes and the spreading of mortars. In this work, the τ 0 of cement pastes was determined by different methods. Specifically, pastes with three different water/cement ratios and two supplementary cementitious materials in Portland cement replacement were produced. The mini slump of the pastes was measured, and its static τ 0 and dynamic τ 0 were determined by rotational rheometry. In addition, small amplitude oscillatory shear (SAOS) was used to further investigate the rigidification rate of the pastes over time, providing valuable information for the discussion. The results showed that the dynamic τ 0 values provided by the different rheological models showed strong correlations. However, these values had weaker correlations with the static τ 0. The rest period between the finish of the pre-shear and the test run strongly affected the magnitude of the stress overshoot and therefore the static τ 0 value. SAOS indicated that the decrease in the inter-particle distance increased the rigidification rate of the paste within the first minute after mixing, which may affect the mini slump results. Finally, the use of the mini slump as a single test to generally evaluate cement pastes with wide ranges of flowability may not be adequate, in line with the existence of different tests for the evaluation of conventional and self-compacting concretes.

show abstract

“…Além disso, a substituição do cimento por até 20% do RPP permitiu a produção de CAA com desempenho igual ou superior ao de referência (sem RPP), em relação às suas propriedades de estado fresco (MATOS et al, 2018). Já em CAA com apenas adição de RPP, observou-se aumento de resistência aos 90 dias, diminuição da absorção e índices de vazios, decréscimo do coeficiente de migração de cloretos e, consequentemente, aumento da durabilidade do material (LIMA, 2015).…”

Section: Resíduo Do Polimento Do Porecelanatounclassified