Effects of curing methods on UCS test specimens and variability of mechanical properties of cemented paste backfill

Niroshan, Naguleswaran; Sivakugan, Nagaratnam; Veenstra, Ryan

doi:10.1080/19386362.2019.1666558

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…The compounds formed are similar to those that form when hydraulic portland cement hydrate. Pozzolana incorporation in cement facilitates the improvement not only of its physical properties but also its mechanical properties of the concrete [18]. Pozzolanic materials have entirely been used in the partial replacement of cement in concrete and mortar through their use in making blended cement.…”

Section: Introductionmentioning

confidence: 99%

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Nthiga Njiru,

Wachira Muthengia,

Mulwa Munyao

et al. 2023

Advances in Civil Engineering

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Grinding aids (GAs) are polar chemicals introduced in cement mills in either liquid or powder form to improve on mill grindability efficiency. Studies have shown that some GAs not only help in grinding efficiency but also play vital roles in improving the product particle size distribution, product ability to flow in the mill, grinding energy reduction, and improvement on the separator efficiency. This review investigated the impacts of the GAs on the performance of some properties of cement when used as either mortar and/or concrete. The influence of the GAs incorporation in cement grinding on properties such as workability and setting times of the placed concrete and/or mortar has been covered in this review. The performance of GAs on ordinary portland cement (OPC) and blended cements with other supplementary cementitious materials such as pozzolana, fly ash, and slag has also been discussed. This is in view to tapping the maximum benefits of using GAs in cement production and use. This review work established that GAs have a positive influence on mill performance when properly applied. It further established that blended cements work better when dosed with additives such as GAs and/or quality improvers when compared to OPC. The review work demonstrated that some superplasticizers help in lowering the water demand in highly blended pozzolanic-based cements. The review finally recommended that the future course of action in the production of blended cements should apply GAs. This is in order to help produce highly replaced blended cements that are sustainable.

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Section: Introductionmentioning

confidence: 99%

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Nthiga Njiru,

Wachira Muthengia,

Mulwa Munyao

et al. 2023

Advances in Civil Engineering

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“…Tailings are deposited conventionally as a slurry in a structure called tailings dam [1,24,25,33,60,90,92]. The deposited slurry tailings in the dam are considered typically soft, loose and constantly saturated [43,55]. Consequently, they are susceptible to liquefaction phenomenon when subjected to any strong earthquake shaking or seismic loadings [36].…”

mentioning

confidence: 99%

Dynamic response of thickened tailings in shaking table testing

Alshawmar

Fall

2021

Geo-Engineering

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In this study, an instrumented thickened tailings deposit model was designed, built and employed to evaluate the behaviour of layered thickened tailings to dynamic loading by using a shaking table equipment. The thickened tailings were deposited subsequently in three thin layers in a flexible laminar shear box mounted on top of the shaking table. Cyclic loading with a peak horizontal acceleration of 0.13 g and a frequency of 1 Hz was applied to the layered tailings deposit. Different types of sensors were placed to monitor the accelerations, displacements, volumetric water content and pore water pressures at the intermediate depth of each layer. Results indicated that the acceleration for the bottom and middle layers were similar to that of the base of the shaking table; but, this was not the case for the top layer. The measurements of vertical displacements indicated that all layers of thickened tailings experienced initially contraction and subsequently dilation during the shaking. The excess pore water pressure ratios were found to exceed unity through all layers of thickened tailings when the shaking ended. In other words, the results showed that the layered thickened tailings are susceptible to liquefaction under the considered testing conditions. It is also found that upward pore water migration to the top layer and downward pore water flow to the bottom layer occurred in the thickened tailings deposit. This water migration generated additional pore water pressure and also impacted the vertical displacement and liquefaction susceptibility of the thickened tailings material. The results of this study give a better understanding of the dynamic behaviour of thickened tailings, which is crucial for the safety of thickened tailings systems as well as sustainable mining.

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Dynamic mechanical response and damage evolution of cemented tailings backfill with alkalized rice straw under SHPB cycle impact load

Song

Hao

Wang

et al. 2022

Construction and Building Materials

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Effects of curing methods on UCS test specimens and variability of mechanical properties of cemented paste backfill

Cited by 5 publications

References 9 publications

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Dynamic response of thickened tailings in shaking table testing

Dynamic mechanical response and damage evolution of cemented tailings backfill with alkalized rice straw under SHPB cycle impact load

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