Assessment of aggregates- cement paste border in concretes containing silica fume and fly ash

The bond between aggregate and cement paste, called the interfacial transition zone (ITZ) is an important parameter that effect on the mechanical properties and durability of concrete. Transition zone microstructure and porosity (pores) of cement paste or concrete are affected by the type and proper...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Ali Sademomtazi, Behzad Tahmouresi
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2017
Materias:	fly ash silica fume transition zone porosity durability Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/1d23539cdd2642a1930b847666c9cd1e
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:1d23539cdd2642a1930b847666c9cd1e
record_format	dspace
spelling	oai:doaj.org-article:1d23539cdd2642a1930b847666c9cd1e2021-11-08T15:46:54ZAssessment of aggregates- cement paste border in concretes containing silica fume and fly ash2476-39772538-261610.22065/jsce.2017.81146.1129https://doaj.org/article/1d23539cdd2642a1930b847666c9cd1e2017-12-01T00:00:00Zhttps://www.jsce.ir/article_46677_c84a41ab69bdda549c4e9a571132f45c.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616The bond between aggregate and cement paste, called the interfacial transition zone (ITZ) is an important parameter that effect on the mechanical properties and durability of concrete. Transition zone microstructure and porosity (pores) of cement paste or concrete are affected by the type and properties of materials used which evaluated in this research. On the other hand, the use of efficient, low-cost and reliable method is particularly important for evaluating of concrete performance against the chloride ion penetration and its relationships with transition zone as a suitable index to assess the durability. So far, various methods to approach the electrical Indices are presented. In this research, the effect of pozzolanic materials fly ash (10%, 20% and 30%) and silica fume (5% and 10%) as substitute of cement by weight in binary and ternary mixtures on the fresh and hardened concrete properties were investigated. To determine mechanical properties, the compressive strength, splitting tensile strength and modulus of elasticity tests were performed. Also, water penetration depth, porosity, water sorptivity, specific electrical resistivity, rapid chloride penetration test (RCPT) and rapid chloride migration test (RCMT) tests were applied to evaluate concrete durability. To examine the border of aggregate and cement paste morphology of concrete specimens, scanning electron microscope images (SEM) was used. The fresh concrete results showed that the presence of silica fume in binary and ternary mixtures reduced workability and air content but fly ash increased them. Adding silica fume to mixtures of containing flay ash while increasing mechanical strength reduced the porosity and pores to 18%. The presence of pozzolanic materials in addition to increasing bond quality and uniformity of aggregate-cement matrix border a considerably positive effect on the transport properties of concrete.Ali SademomtaziBehzad TahmouresiIranian Society of Structrual Engineering (ISSE)articlefly ashsilica fumetransition zoneporositydurabilityBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 4, Iss 4, Pp 136-154 (2017)
institution	DOAJ
collection	DOAJ
language	FA
topic	fly ash silica fume transition zone porosity durability Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	fly ash silica fume transition zone porosity durability Bridge engineering TG1-470 Building construction TH1-9745 Ali Sademomtazi Behzad Tahmouresi Assessment of aggregates- cement paste border in concretes containing silica fume and fly ash
description	The bond between aggregate and cement paste, called the interfacial transition zone (ITZ) is an important parameter that effect on the mechanical properties and durability of concrete. Transition zone microstructure and porosity (pores) of cement paste or concrete are affected by the type and properties of materials used which evaluated in this research. On the other hand, the use of efficient, low-cost and reliable method is particularly important for evaluating of concrete performance against the chloride ion penetration and its relationships with transition zone as a suitable index to assess the durability. So far, various methods to approach the electrical Indices are presented. In this research, the effect of pozzolanic materials fly ash (10%, 20% and 30%) and silica fume (5% and 10%) as substitute of cement by weight in binary and ternary mixtures on the fresh and hardened concrete properties were investigated. To determine mechanical properties, the compressive strength, splitting tensile strength and modulus of elasticity tests were performed. Also, water penetration depth, porosity, water sorptivity, specific electrical resistivity, rapid chloride penetration test (RCPT) and rapid chloride migration test (RCMT) tests were applied to evaluate concrete durability. To examine the border of aggregate and cement paste morphology of concrete specimens, scanning electron microscope images (SEM) was used. The fresh concrete results showed that the presence of silica fume in binary and ternary mixtures reduced workability and air content but fly ash increased them. Adding silica fume to mixtures of containing flay ash while increasing mechanical strength reduced the porosity and pores to 18%. The presence of pozzolanic materials in addition to increasing bond quality and uniformity of aggregate-cement matrix border a considerably positive effect on the transport properties of concrete.
format	article
author	Ali Sademomtazi Behzad Tahmouresi
author_facet	Ali Sademomtazi Behzad Tahmouresi
author_sort	Ali Sademomtazi
title	Assessment of aggregates- cement paste border in concretes containing silica fume and fly ash
title_short	Assessment of aggregates- cement paste border in concretes containing silica fume and fly ash
title_full	Assessment of aggregates- cement paste border in concretes containing silica fume and fly ash
title_fullStr	Assessment of aggregates- cement paste border in concretes containing silica fume and fly ash
title_full_unstemmed	Assessment of aggregates- cement paste border in concretes containing silica fume and fly ash
title_sort	assessment of aggregates- cement paste border in concretes containing silica fume and fly ash
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2017
url	https://doaj.org/article/1d23539cdd2642a1930b847666c9cd1e
work_keys_str_mv	AT alisademomtazi assessmentofaggregatescementpasteborderinconcretescontainingsilicafumeandflyash AT behzadtahmouresi assessmentofaggregatescementpasteborderinconcretescontainingsilicafumeandflyash
_version_	1718441640898592768

Assessment of aggregates- cement paste border in concretes containing silica fume and fly ash

Ejemplares similares