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The potential reactivity of aggregatescausesthe alkali - aggregate reaction
resulting in an internal reaction with the active ingredient in concrete aggregates ,leadingto alkali - aggregate reaction
how deleterious expansionresultingfrom alkali aggregate reaction
Careful selection of aggregates and consideration of silica content can helppreventalkali - aggregate reactions
which cause excessive expansion of the cementsets( alkali - aggregate reaction
such a high alkaline environmentcan causealkali aggregate reaction problem
a factorinfluencingalkali aggregate reaction
Key parametersinfluencingthe alkali aggregate reaction
Use of pozzolanic admixtureswill preventthe alkali - aggregate reaction
Surface cracking promotes water intrusion which can lead to metal corrosion and spalling.and consideration of silica content can helppreventalkali - aggregate reactions
The expansive behaviororiginatingfrom the alkali - aggregate reaction
alkali metal ions(passive) caused bythe alkali - aggregate reaction
3.Itcan preventfrom the alkali - aggregate reaction
Figure 18.—Gelresultingfrom alkali - aggregate reaction
Map / Pattern CrackingResultingfrom an Alkali - Aggregate Reaction Alkali - aggregate reaction
increase the compactness of the hardened cementthereby preventingthe alkali aggregate reaction
expansive strainsresultingfrom an alkali – aggregate reaction
The cements used ... a limited alkali contentto preventalkali - aggregate reaction
Another source of damage ... de - icing saltstriggeran alkali - aggregate reaction
As a harmful aggregateto causethe alkali - aggregate reaction
attention ... an agentto preventalkali - aggregate reaction
Among the many durability requirements ,to preventalkali aggregate reaction
expansion and crackingcausesexpansion and cracking
in disruptive expansionresultsin disruptive expansion
damaging expansion in concrete(passive) caused bydamaging expansion in concrete
significant cracking in a concrete element or ACRmay causesignificant cracking in a concrete element or ACR
expansion anddamage in some concretescausedexpansion anddamage in some concretes
to deterioration of concretecontributeto deterioration of concrete
Concrete deterioration(passive) caused byConcrete deterioration
disintegration of the concrete see pagecausingdisintegration of the concrete see page
serious problems in concrete hydraulic structures , such as dams and powerhouses a thorough understanding of the current knowledge and practice in managing this reaction can help owners of existing dams and companies planning to build new damscausesserious problems in concrete hydraulic structures , such as dams and powerhouses a thorough understanding of the current knowledge and practice in managing this reaction can help owners of existing dams and companies planning to build new dams
in ‘ Alkali Silicate Gelresultsin ‘ Alkali Silicate Gel
expansion of its concrete structure ( Hayman et al . 2010is causingexpansion of its concrete structure ( Hayman et al . 2010
concrete damagemight causeconcrete damage
failure of concretecan createfailure of concrete
cracks in concrete(passive) could have been caused bycracks in concrete
the concrete to “ growcausesthe concrete to “ grow
to weakening of concrete matrixleadsto weakening of concrete matrix
the concrete to expand and crackcausedthe concrete to expand and crack
cracking of the concrete in the spillway pier at Matala Dam in Angolacausedcracking of the concrete in the spillway pier at Matala Dam in Angola
the potential loss of concrete strength(passive) caused bythe potential loss of concrete strength
harmful effects to concrete structureswill causeharmful effects to concrete structures
the concrete to swell and renders renovations or even reconstructions necessarycausesthe concrete to swell and renders renovations or even reconstructions necessary
when alkalis normally present in cement react with silicious aggregates in concrete that is exposed to moistureresultwhen alkalis normally present in cement react with silicious aggregates in concrete that is exposed to moisture
an expansive action when reactive aggregates come in contact with alkali hydroxides in the hardened concretecan causean expansive action when reactive aggregates come in contact with alkali hydroxides in the hardened concrete
AAR ) Chemical physical expansive reaction in mortar or concrete between reactive mineral Natural sandsmay leadAAR ) Chemical physical expansive reaction in mortar or concrete between reactive mineral Natural sands
A similar effect(passive) is caused byA similar effect
mainly of quartz , alkaline feldspars , plagioclases , micas , and other secondarycomposedmainly of quartz , alkaline feldspars , plagioclases , micas , and other secondary
existing structures Surface popouts(passive) caused byexisting structures Surface popouts
time and strengthsettingtime and strength
to the development of low - alkali cements ( Stanton , 1942leadingto the development of low - alkali cements ( Stanton , 1942
resembling(passive) caused byresembling
Confinement effects on damage development(passive) caused byConfinement effects on damage development
in fissurescan resultin fissures
the dam to crumblecausingthe dam to crumble