The influence of fly ash cenospheres on the details of cracking in flyash-bearing cement pastes

Montgomery, Denis; Diamond, Sidney

doi:10.1016/0008-8846(84)90001-2

Cited by 38 publications

(8 citation statements)

References 3 publications

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“…Recent studies have evaluated the effects of cenospheres on thermal and mechanical performance [6], [8]- [12], acoustic properties [13], influence on concrete durability (crack propagation [14]), water transport [15], and alkali-silica reaction [16]. There have also been innumerable studies of cenospheres themselves (e.g., [17]) and of cenosphere coatings and composites [18]- [20].…”

Section: Introductionmentioning

confidence: 99%

Multi-scale study of high-strength low-thermal-conductivity cement composites containing cenospheres

Rheinheimer

et al. 2017

Cement and Concrete Composites

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Cenosphere particles are hollow, but due to their hard shells, they can be used in cementitious composites to produce ultra-lightweight cement composites (ULCC) with high strength and low thermal conductivity. This study integrates thermal conductivity with mechanical experimental research, microscopic investigation, and numerical simulations to provide new insights into the behavior of these advanced composites. The microstructure of ULCC samples was characterized using synchrotron high-resolution microtomography, transmission electron microscopy and scanning electron microscopy. Composite models were used to predict the thermal conductivity of the cenospheres based on the experimental results of ULCC thermal conductivity and the porosity of the samples.

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Section: Introductionmentioning

confidence: 99%

Multi-scale study of high-strength low-thermal-conductivity cement composites containing cenospheres

Rheinheimer

et al. 2017

Cement and Concrete Composites

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“…Large, visible cracks can be seen on the surface of standard mortar, while no cracks are visible on the surface of LCCC. The interface transition zone between cenosphere and cement paste was evaluated using SEM before and after exposure to 600 °C [6,8]. The interface seems to be unaffected by exposure to 600 °C and there are no visible cracks.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…A mix of cement, water and cenosphere was probably first proposed by Gebhardt (patent US3782985A: Lightweight, high strength concrete and method for manufacturing the same, with cement to cenosphere ratios between 0.2:1 to 4:1), later studied by Montgomery & Diamond [8] with cement to cenosphere to water ratio of 1:0.43:0.5. Liu et al [9] proposed a mix with silica fume and superplasticiser and studied water and chloride ion penetration resistance of lightweight cementitious composite with cenosphere.…”

Section: Introductionmentioning

confidence: 99%

Lightweight cementitious composites containing cenospheres and polypropylene fibres after exposure to high temperatures

Szymkuć

Tokłowicz

2020

MATEC Web Conf.

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The paper presents the results of experimental investigation of lightweight cementitious composites with cenospheres (LCCC) exposed to high temperatures. We showed the positive effect of cenospheres on post- fire residual compressive strength in previous papers. This paper focuses on the LCCC with the addition of polypropylene (PP) fibres. Specimens are heated up to 400, 600, 800, 1000 and 1200 °C. Then they are cooled to ambient temperature and their residual flexural and compressive strength is tested. The results are compared with non-heated specimens with compressive strength above 50 MPa. For plain LCCC composites, the results show significant improvement of residual compressive strength in comparison with typical concretes. No significant changes of compressive strength are found after exposure to temperatures up to 600°C – more than 85 % of the residual compressive strength is retained after exposure to this temperature for both mixes. Polypropylene fibres are found to be a successful mean to mitigate spalling without significantly lowering neither ambient nor residual compressive strength. Moreover, designed composite has low density and low thermal conductivity at room temperature.

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“…Most of the cracks go through the cenospheres which shows the energydissipating mechanism. Also, the cenosphere surfaces parted from cement materials showed less chemical reaction [6,8]. Figure 8 shows the results of XRD analysis.…”

Section: Sem and Xrd Analysismentioning

confidence: 99%

“…The lightweight concrete prepared with powder-packing theory in order to obtain concrete with the lowest possible density was tested and the results show the loss of resistance to compression in dependence on density [1]. Cenospheres in fly ash-cement systems appear to act as energy-dissipating inclusions in fracture and do not necessarily weaken the system [8]. As for a matrix to maintain the strength of binding material, we had used silica fume.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Strength Development of Cement with Cenosphere and Silica Fume as Pozzolanic Replacement

Kannan¹,

Andal

Shanmugasundaram³

2016

Advances in Materials Science and Engineering

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In the detailed study presented in this paper, an attempt was made to study the strength of cement when cenosphere (CS) and silica fume (SF) were used as replacement. Tests were carried out on mix with cenosphere as replacement for cement which has 12% of constant replacement of silica fume to the mass of cement, and this is made to stabilize the strength which was lost due to addition of cenosphere. From the test results, it was concluded that the strength loss of binder due to replacement of cenosphere can be stabilized by silica fume and still a safe value of strength can be achieved. Furthermore, the strength reduction is due to the consumption of hydration products and cloggy microstructure as observed in this study.

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The influence of fly ash cenospheres on the details of cracking in flyash-bearing cement pastes

Cited by 38 publications

References 3 publications

Multi-scale study of high-strength low-thermal-conductivity cement composites containing cenospheres

Multi-scale study of high-strength low-thermal-conductivity cement composites containing cenospheres

Lightweight cementitious composites containing cenospheres and polypropylene fibres after exposure to high temperatures

An Investigation on Strength Development of Cement with Cenosphere and Silica Fume as Pozzolanic Replacement

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