what are the factors affecting the durability of concrete,there could be many factors which may affect the durability of concrete some of these factors described in is 456:2000 are - 1 - the environment - it is to be seen the general environment to which the concrete be exposed during its working life classified into five levels of severity.(pdf) study of durability of concrete | irjet journal,these all explain the durability of the structure. factors affecting durabiltythese factors can be broadly classified under two sections i) the concrete systemii) the service environmentthe concrete system depends on the materials and processes involved. materials depend in turn on the binding material type and content, design mix and admixtures..
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the strength class of the concrete plays a major role in the durability of the concrete. eurocode 2, table 4.3n classifies the structures and as per its classification, different strenth classes are recommended depending on the exposure conditions. the water-cement ratio is directly related to the strength of the concrete.
1. introduction. concrete is a construction material that is extensively used because of its excellent properties such as durability, workability, satisfactory strength, and the easy availability of raw materials (cement, aggregates, and water), which are used to produce it .by definition, concrete is a composite material that consists of a binding medium and aggregate particles and can be
factors affecting the workability of concrete are materials such as water content, cement concrete, sand and aggregate properties such as size, shape, grading, mix design ratio and use of admixtures. each and every process and materials involved in concrete mixing affects the workability of concrete.
factors affecting durability of concrete 27th january 2010 concrete durability has been defined by the american concrete institute as its resistance to weathering action, chemical attack, abrasion and other degradation processes. (usa) — durability is the ability to last a long time without significant deterioration.
biological factors: mosses and lichens of a better order, cause considerable damage the durability of concrete. these crops produce weak acids within the hair roots, the acids which can be produced attack the cement paste causes the concrete to decompose and scale.
the durability of concrete will be affected by the shrinkage of concrete. if the cement content is exceeded, it leads to shrinkage happening in concrete. the lower cement content decreases the bondage between the concrete materials, reducing concrete strength. so using the proper amount of cement content is essential.
it is considered the most important factor for durability. it can be noticed that higher permeability is usually caused by higher porosity. therefore, a proper curing, sufficient cement, proper compaction and suitable concrete cover could provide a low permeability concrete.
factors of affecting workability of concrete effect of time on workability of concrete the time has same impact on workability of concrete, as is of the temperature. it is without a doubt that the concrete matrix gets stiffened with the passage of time, as a result of hydration reaction.
durability is a function of numerous factors including the mix design, placement and curing methods, and concrete element design. the goal is to prevent or minimize cracking. existing structures that are beginning to show deterioration can be retrofit in many cases to restore them to integrity and add years to their life.
consequences of inadequate durability • loss of strength of concrete • loss of serviceability • unpleasant appearance • danger to persons and property • expensive repair costs • poor perception of concrete as a material • reduction of service life • external agencies like weathering, attack by natural or industrial liquids, gases, bacterial growth etc. • ingression of moisture/air facilitating
the main factor affecting any durability property of concrete is its porousness. try to use any supplementary mineral admixtures with higher specific surface area than opc. this would ensure less...
higher the water content per cubic meter of concrete, the higher will be the fluidity of concrete, which is one of the important factors affecting workability. adding more water to concrete also has some disadvantages as given below. increased quantity of water may cause bleeding in concrete. cement slurry also escapes through the joints of formwork
followings are the factors affect the workability of concrete. water content; mix proportions; size of aggregates; shape of aggregates; grading of aggregates; surface texture of aggregates; use of admixtures; use of supplementary cementitious materials; time; temperature; these factors are briefly discussed below. water content. it is the most important factor of workability.
the factors affecting the durability of concrete may be external or internal causes. external causes the external causes may be physical, chemical and mechanical as described below:
factors affecting durability of concrete: 1. cement content: quantity of cement used in concrete mix will also affects durability of concrete. if cement content used is lower than the required, then water cement ratio becomes reduced and durability is affected.
factors affecting the durability of concrete repair: the contractor's viewpoint p. h. emmons and a. m. vaysburd* structural preservation systems inc., baltimore, maryland, usa received 31 august 1993; accepted 31 october 1993 the purpose of this paper is to present the repair contractor's point of view on the current state of knowledge of concrete repair and to present the methodology for the
effect of w/c ratio on durability: w/c ratio has a great impact on the durability of the concrete. higher w/c ratio is the main cause of volume change and higher permeability of concrete. the use of higher w/c ratio causes permeability, volume change, cracks, disintegration and finally the failure is
strength and workability are both dominating factors in the making of concrete. strength can be increased by increasing cement content but this in fact reduces the workability. moreover,the water content can be increased for better workability, but this affects the strength.
the aggregate/cement ration is also an important factor that affects the workability of concrete. in the higher aggregate/cement ratio cement paste is available in low amount in concrete which make leaner concrete hence the mobility of aggregate in concrete is restrainer end of result reduce of workability
durability of concrete and concrete structures 1. introduction 2. factors affecting durability 3. codal provisions 4. chemical action on concrete 5. permeability and durability 6. construction considerations 7. environmental effects on concrete 8. carbonation 9. corrosion of steel 10. effect of some materials on durability
the durability of contemporary concrete is discussed in view of changed technology and performance requirements. blast-furnace slag cements are found to provide desirable dense microstructures and chemical immunity to attack by sulfates and alkalies.
factors affecting strength and durability of concrete made with various cements k. rose, b. b. hope, and a. k. c. ip this investigation examined variables influencing the 28-day com pressive strength and so-cycle salt scaling loss of concretes made with 18 type
many factors may affect the durability of concrete structures such as structural design, concrete quality (which may include mix design, quality and consistency of raw materials, mixing and...
description : explain two factors affecting properties of hardened concrete. answer : factors affecting properties of hardened concrete: 1. type and quality of materials used: if type and quality of materials used for concrete i.e. cement, sand, aggregate and water is in concrete. the sudden change in weather conditions reduces strength and