Effects of densified silica fume on microstructure and compressive strength of blended cement pastes

Ji, Yajun; Cahyadi, Jong Herman

doi:10.1016/s0008-8846(03)00100-5

Cited by 128 publications

(42 citation statements)

References 11 publications

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“…Particle grading of DSF particles is significantly coarser as compared to both HCWA and PC particles. The observation is consistent with the findings of other researchers (Yajun and Cahyadi, 2003) and serves as further evidence that the densification of silica fume results in agglomeration of silica fume clustered particles forming large diameter agglomerates. By using the laser diffraction surface area measurement technique, the measured specific surface area of DSF is the specific surface area of silica fume agglomerates.…”

Section: Densified Silica Fume (Dsf)supporting

confidence: 92%

Properties of high calcium wood ash and densified silica fume blended cement

Cheah¹

2011

Int. J. Phys. Sci.

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Recycling industrial waste material as construction material to minimize production of ordinary Portland cement could solve arising industrial waste management problems and increase environmental sustainability. This study focused on the incorporation of wood biomass ash in combination with silica fume in blended cement. In this study, physical and chemical properties of high calcium wood ash (HCWA) and densified silica fume (DSF) were thoroughly characterized. Results indicated that HCWA is an active hydraulic binder material as it is rich in calcium carbonate and quicklime content. Fresh concrete properties showed HCWA-DSF blended cement pastes have marginally higher standard consistency and significantly longer setting times as compared to pure cement paste. Additionally, hard concrete properties, such as mechanical strength, water absorption, air permeability and chloride resistance properties of mortar were also investigated. Enhancement in the compressive and flexure strength of mortar was observed for mortar mixes containing DSF and HCWA. The incorporation of HCWA at level of cement replacement ranging between 4 to 12% in combination with 7.5% of DSF was observed to significantly improve the chloride resistance of mortar mixes produced.

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Section: Densified Silica Fume (Dsf)supporting

confidence: 92%

Properties of high calcium wood ash and densified silica fume blended cement

Cheah¹

2011

Int. J. Phys. Sci.

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“…The improving influence of densified SF on the non-evaporable water contents, however, is less than that of raw SF. The effective surface of the densified SF for reacting with CH is reduced due to the agglomeration, and thus the pozzolanic reaction is weakened [30]. It is notable that the nonevaporable water contents of the samples cured at 50°C are higher than that of the samples cured at 20°C at early ages.…”

Section: Non-evaporable Watermentioning

confidence: 98%

Hydration and microstructures of concrete containing raw or densified silica fume at different curing temperatures

Zhang

Yan

2016

Construction and Building Materials

117

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“…Moreover, exerting justification constraint during preparation of specimens caused sufficient cement to be used for S/S treatment and as a result any probable positive effect of CSF on leaching concentrations was not observed clearly. In addition, CSF particle Influence of CSF on characteristics of cement-based solidified heavy metalscontaminated soil for road pavement Hassani, Ganjidoust and Rajabpour Ashkiki size was another important factor as if coarse particles of CSF agglomerated, the potential for pozzolanic activity was reduced (Yajun and Cahyadi, 2003) and there was a decrease in C-S-H gel production, which has a high surface area. This may negatively affect the stabilisation of those metals for which absorption on the surface of C-S-H gels is the main immobilising mechanism (Spence and Shi, 2004).…”

Section: Leaching Resultsmentioning

confidence: 99%

Influence of condensed silica fume on characteristics of cement-based solidified heavy metals-contaminated soil for road pavement

Hassani¹,

Ganjidoust²,

Ashkiki³

2011

Advances in Cement Research

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The solidification/stabilisation of heavy metals-contaminated soil using ordinary Portland cement and the influence of condensed silica fume (CSF) on the characteristics of solidified soil for possible pavement application were investigated in the present study. The soil to cement ratio was 1 : 12 . 5 and CSF was added at 3, 5 and 8% of cement by weight to mixtures during specimen preparation. The tests carried out included compressive strength, water absorption and toxicity characteristic leaching procedure, X-ray diffraction and scanning electron microscopy. At early curing ages, heavy metals-contaminated soil intensively decreased the compressive strength from 12 . 3 N/mm 2 in cement mixture to 0 . 14 N/mm 2 in the soil-cement mixture; and CSF had no noticeable effect on compressive strength but increased the consolidation of the relevant mixtures which satisfied the minimum US Environmental Protection Agency's regulatory limit for safe land disposal. During ageing, CSF gradually enhanced the retarded and diverted cement hydration reactions and the relevant solidified mixtures met the ACI 299R-99 requirement for controlled low strength materials in limited constructions. As an important result, the 28-day-cured soil-cement mixture which included CSF (8% by cement weight) achieved compressive strength of 45 N/mm 2 , which was greater than UK transportation requirement for pavement concrete. Leaching results showed that CSF with a particle size finer than 150 ìm and at the added amounts had no significant and noticeable effect on the leaching characteristics. Based on X-ray diffraction patterns, the hydration reactions appeared to be diverted through the production of subsidiary products and as a result, major crystalline phases grew and developed irregularly and consequently coated the aggregates poorly, as observed in scanning electron micrographs. CSF decreased the water absorption of the solidified mixtures in which it was included and their structure became dense.

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Effects of densified silica fume on microstructure and compressive strength of blended cement pastes

Cited by 128 publications

References 11 publications

Properties of high calcium wood ash and densified silica fume blended cement

Properties of high calcium wood ash and densified silica fume blended cement

Hydration and microstructures of concrete containing raw or densified silica fume at different curing temperatures

Influence of condensed silica fume on characteristics of cement-based solidified heavy metals-contaminated soil for road pavement

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