NDLI: Properties of fresh concrete incorporating a high volume of fly ash as partial fine sand replacement

Please wait, while we are loading the content...

Properties of fresh concrete incorporating a high volume of fly ash as partial fine sand replacement

Content Provider	Springer Nature Link
Author	Ravina, Dan
Copyright Year	1997
Abstract	The use of fly ash in concrete is very common nowadays, mainly as a partial replacement for cement. However, the amount actually used in many countries is only between 15 to 25 percent. Disposal of unusable fly ash raises severe ecological problems and is quite expensive, not to mention the difficulty of finding dumping sites. Increased utilization of fly ash is thus, in many countries, in the national interest.A research program was initiated on the utilization of large quantities of fly ash Class F of marginal-quality in concrete as partial fine-sand replacement. The present paper studies the effect of such replacement on the properties of fresh concrete. The mechanical properties of the hardened concrete will be presented in another paper.The workability of most fly-ash mixtures was better than that of the reference mix (without fly ash). The water requirement of the fly-ash mixtures was either the same, or higher by about 9 percent, as compared with the reference mix. The rate and volume of bleeding were rather similar for the fly ash and the reference mixes. However, a significant reduction in bleeding by the fly-ash was found in the concrete mixtures with the chemical admixtures water reducer and retarder and high-range water reducer. Setting was delayed by the fly-ash, but the additional delay, that beyond the effect of the chemical admixture proper, was much less in the mixtures with the water reducer and retarder and negligible in the mixtures with the high-range water reducer.L’utilisation de cendres volantes dans le béton est courante de nos jours, principalement en remplacement partiel du ciment. Cependant, la quantité actuellement utilisée dans beaucoup de pays n’est que de 15 à 25%. Se débarrasser des cendres volantes inutilisables pose de sérieux problèmes écologiques et coûte cher, sans parler des difficultés à trouver des décharges. Une utilisation accrue des cendres volantes est donc d’intérêt national dans de nombreux pays.Un programme de recherches a été entrepris sur l’utilisation de grandes quantités de cendres volantes de qualité marginale (classe F) en remplacement partiel de sable fin. Cet article étudie les effets de tels remplacements sur les propriétés du béton frais. Les propriétés mécaniques du béton durci seront présentées dans un autre article.La maniabilité de la plupart des mélanges de cendres volantes était supérieure à celle du mélange de référence (sans cendres volantes). Les besoins en eau des mélanges aux cendres volantes étaient égales ou supérieures d’environ 9% au mélange de référence. Les taux et les volumes de ressuage étaient similaires pour les deux. Par contre, une diminution significative des ressuages par les cendres volantes a été constatée dans les mélanges ayant des adjuvants chimiques réducteurs d’eau-retardateurs et plastifiants-hauts réducteurs d’eau. Le temps de prise a été retardé par les cendres volantes, mais pour les mélanges avec adjuvants chimiques le retard, au-delà des effets des adjuvants eux-mêmes, était bien moindre avec le réducteur d’eau-retardateur et négligeable avec le plastifiant-haut réducteur d’eau.
Starting Page	473
Ending Page	479
Page Count	7
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	30
Issue Number	8
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Mechanical properties of structural concrete incorporating a high volume of Class F fly ash as partial fine sand replacement

Abrasion resistance and mechanical properties of high-volume fly ash concrete

Fresh properties of self-compacting rubberized concrete incorporated with fly ash

Use of spent foundry sand and fly ash for the development of green self-consolidating concrete

Effect of high volume fly ash on mechanical properties of fiber reinforced concrete

Fresh properties of self-compacting cold bonded fly ash lightweight aggregate concrete with different mineral admixtures

Microstructure and mechanical properties of accelerated sprayed concrete

Durability properties of high volume fly ash concrete containing nano-silica

Simulation of a temperature rise in concrete incorporating fly ash or slag

Properties of fresh concrete incorporating a high volume of fly ash as partial fine sand replacement

Similar Documents

Mechanical properties of structural concrete incorporating a high volume of Class F fly ash as partial fine sand replacement

Abrasion resistance and mechanical properties of high-volume fly ash concrete

Fresh properties of self-compacting rubberized concrete incorporated with fly ash

Use of spent foundry sand and fly ash for the development of green self-consolidating concrete

Effect of high volume fly ash on mechanical properties of fiber reinforced concrete

Fresh properties of self-compacting cold bonded fly ash lightweight aggregate concrete with different mineral admixtures

Microstructure and mechanical properties of accelerated sprayed concrete

Durability properties of high volume fly ash concrete containing nano-silica

Simulation of a temperature rise in concrete incorporating fly ash or slag

Properties of fresh concrete incorporating a high volume of fly ash as partial fine sand replacement