Increase of the reactivity of densified silica fume by sonication treatment

Rodríguez, Erich D.; Soriano, Lourdes; Payá, J.; Borrachero, M.V.; Monzó, J.

doi:10.1016/j.ultsonch.2012.01.011

Cited by 40 publications

(15 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Studies also show that the agglomerates does not break down properly which will lead to the expansion and cracking of agglomerates [14,15]. To solve this situation, agglomeration was done using ultrasound waves which will scatter the silica fumes in a better way which will make the particles more smaller in size [16,17]. Another methodology is by the use of slurry silica fume which will also increase the density thereby solving the problems of transportation and agglomeration [18] but this has several disadvantages in storage, precipitation and so on because it is affected by the temperature changes .…”

Section: Silica Fume and Its Properties In Concretementioning

confidence: 99%

“…Another methodology is by the use of slurry silica fume which will also increase the density thereby solving the problems of transportation and agglomeration [18] but this has several disadvantages in storage, precipitation and so on because it is affected by the temperature changes . This has been further improved by granulation where the small particles of silica fumes are converted to larger particles without changing the physical properties [16]. Various additives can be used along with silica fumes to improve the properties of mixes.…”

Section: Silica Fume and Its Properties In Concretementioning

confidence: 99%

See 1 more Smart Citation

Nutritional Evaluation of Insect’s Pupae-Larvae and its Utilization in Poultry Compound Feed

Zegeye¹

2020

TOASJ

View full text Add to dashboard Cite

Background: Concrete mixtures are normally poured in single layers without intentional changes in the mixture properties within the thickness of the layers. Objective: In this research paper, alternative approach is introduced with Functionally Layered Concrete (FLC) composites, which have their known functions to achieve the maximum performance index. Methods: The performance index can be defined as the ratio of characteristics to the consumption of resources, fibres and additives. The steel fibre, polypropylene fibre, and silica fume are used in cement composites to make multilayer samples on which mechanical properties evaluations are conducted and compared to that of Mono-Layered Concrete (MLC) samples. Results: It is observed from the results that FLC samples have superior mechanical characteristics compared to MLC samples in terms of compressive strength, flexural strength and elastic modulus. Conclusion: Given that the use of fibres/additives in FLC composites is diminished, acquiring better mechanical performance with minimised consumption of resources would be possible via functionally layered composite method.

show abstract

Section: Silica Fume and Its Properties In Concretementioning

confidence: 99%

Section: Silica Fume and Its Properties In Concretementioning

confidence: 99%

Nutritional Evaluation of Insect’s Pupae-Larvae and its Utilization in Poultry Compound Feed

Zegeye¹

2020

TOASJ

View full text Add to dashboard Cite

show abstract

“…Moreover, due to the nature of the agglomeration, it is also considered very challenging to accurately measure the particle size or size distribution of SF [ 41 ]. Although ultrasonic dispersion or sonification before measurement is somewhat effective [ 44 ], it did not show completely satisfactory results because it could not affect the strong electrical attraction of the whole particles [ 41 , 45 , 46 , 47 ]. In general, laser diffraction (LD) and dynamic light scattering (DLS) are used for particle size analysis of powder materials, with advantages such as short analysis time and good reproducibility [ 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison between Densified and Undensified Silica Fume in Ultra-High Performance Fiber-Reinforced Concrete

2020

View full text Add to dashboard Cite

Silica fume (SF) is a key ingredient in the production of ultra-high performance fiber-reinforced concrete (UHPFRC). The use of undensified SF may have an advantage in the dispersion efficiency inside cement-based materials, but it also carries a practical burden such as high material costs and fine dust generation in the workplace. This study reports that a high strength of 200 MPa can be achieved by using densified SF in UHPFRC with Portland limestone cement. Additionally, it was experimentally confirmed that there was no difference between densified and undensified SFs in terms of workability, compressive and flexural tensile strengths, and hydration reaction of the concrete, regardless of heat treatment, because of a unique mix proportion as well as mixing method for dispersing agglomerated SF particles. It was experimentally validated that the densified SF can be used for both precast and field casting UHPFRCs with economic and practical benefits and without negative effects on the material performance of the UHPFRC.

show abstract

“…This implies sometimes better compressive performance when suspension silica fume is used [242]. There are some alternatives to reach an effective dispersion before the mixing, such as the silica fume sonication [197].…”

Section: Cementmentioning

confidence: 99%

“…This research block was developed together with the Chemical group of the UPV [197]. It was used to cast UHPC with CSF and with SSF (Sonicated Silica Fume), and compare the pozzolan activity by means of the 28 days compressive strength.…”

Section: Experimental Programmentioning

confidence: 99%

Dosage optimization and bolted connections for UHPFRC ties

Camacho¹,

Efraím²

View full text Add to dashboard Cite

No part of this volume may be produced, stored in retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the publishers. Los límites son físicos. Las limitaciones, mentales. Summary Dosage optimization and bolted connections for UHPFRC tiesConcrete technology has been in changeful evolution since the Roman Empire time. It is remarkable that the technological progress became of higher magnitude from the second part of the XX Century. Advances in the development of new cements, the appearance of the fibers as a reinforcement for structural applications, and specially the grand progress in the field of the water reducing admixtures enabled the emergence of several types of special concretes. One of the lasts is the Ultra High Performance Fiber Reinforced Concrete (UHPFRC), which incorporates advances of the Self-Compacting Concrete (SCC), Fiber-Reinforced Concrete (FRC) and Ultra High Strength Concrete (UHSC) technology. This exclusive material requires a detailed analysis of the components compatibility and a high control of the materials and processes. Mainly patented products have been used for the few structural elements carried out so far today, but the costs makes doubtful the development of many other potential applications.In accordance with the previously explained, a simplification of the UHPFRC components and processes is needed. This becomes the first main goal of this Ph.D. thesis, which emphasizes in the use of local available components and simpler mixing processes. Moreover, the singular properties of this material, between ordinary concrete and steel, allow not only the realization of slenderer structures, but also the viability of new concepts unthinkable with ordinary concrete. In this field is focused the second part of the Ph.D. thesis, which develops a bolted connection system between UHPFRC elements. This research summarizes, first of all, the subfamilies belonging to the HPC-UHPC materials. Afterwards, it is provided a detailed comparison between the dosage and properties of more than a hundred of mixtures proposed by several authors in the last ten years of technology. This becomes a useful tool to recognize correlations between dosages and properties and validate or no preconceived ideas about this material.Based on this state of art analysis was performed the later development of mixtures, on Chapter 4, which analized the effect of use of simpler components and processes on the UHPFRC. The main idea was use local components available in the Spanish market, identifying the combinations that provide the best rheological and mechanical properties. Steam curing use was avoided since a process simplification is intended. Diferent dosages were developed to be adapted to various levels of performance, and always trying to be as economical as possible. The concretes designed were selfcompacting and mainly combined two fiber types (hybrid), as the flexural performance was of greater relevanc...

show abstract

Increase of the reactivity of densified silica fume by sonication treatment

Cited by 40 publications

References 20 publications

Nutritional Evaluation of Insect’s Pupae-Larvae and its Utilization in Poultry Compound Feed

Nutritional Evaluation of Insect’s Pupae-Larvae and its Utilization in Poultry Compound Feed

Performance Comparison between Densified and Undensified Silica Fume in Ultra-High Performance Fiber-Reinforced Concrete

Dosage optimization and bolted connections for UHPFRC ties

Contact Info

Product

Resources

About