2 edition of Influence of cement composition on concrete durability in chloride-sulfate environments found in the catalog.
Influence of cement composition on concrete durability in chloride-sulfate environments
Hamoud Ahmad Farhan Dehwah
Written in English
Thesis (Ph.D.) - Loughborough University, 1999.
|Statement||by Hamoud Ahmad Farhan.|
Durability of Concrete in Cold Climates explains how concrete can be designed and produced to be durable in cold environments, through careful selection of materials, mixture composition and proper use of air entrainment. It is fully illustrated with photographs and diagrams and contains over references to sources and other publications.5/5(1). Fresh concrete is that stage of concrete in which concrete can be moulded and it is in plastic state. This is also called "Green Concrete". Another term used to describe the state of fresh concrete is consistence, which is the ease with which concrete will flow. The transition process of changing of concrete from plastic state to hardened state.
Hydration and Compressive Strength of Blended Cement Containing Fly Ash and Limestone as Cement Replacement Journal of Materials in Civil Engineering June Role of Chloride Ion and Cation Type Accompanied by Sulfate Ion on Durability Performance of Concrete in Conjoint Chloride–Sulfate Environment. A, “Influence of Sulfate ions and Associated Cation Type on Pore Solution Chemistry", the Cement and Concrete Composites Journal, special issue on Concrete Durability, Vol. .
This paper presents an experimental investigation of the sulfuration mechanism of concrete. The microstructure, mineral phase composition, substance content, and pH of the concrete were determined using scanning electron microscopy, X-ray diffraction, comprehensive thermal analysis, and pore-solution pH test. It was observed that light-grey spots appeared on the surface of the specimen, . Durability: The durability of cement is defined as its ability to resist weathering action, chemical attack, abrasion, or any other process of e concrete will retain its original form, quality, and serviceability when exposed to environment.
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Concrete ingredients, their proportioning, interactions between them, placing and curing practices, and the service environment determine the ultimate durability and life of the concrete.
The heavily traveled Wacker Drive replacement in downtown Chicago was designed for a to year life. Cement alkalies also cause concrete durability problems due to alkali-silica reaction, in conjunction with aggregates containing reactive siliceous constituents.
In addition to the C 3A phase, cements with high C 3S/C 2S ratios also are prone to sulfate attack of a softening type caused by gypsum by: Influence of cement composition on concrete durability in chloride-sulfate environments Author: Dehwah, Hamoud Ahmad Farhan ISNI: Awarding Body: Loughborough University Current Institution: Loughborough University Date of Award: Cited by: 3.
The results indicate that sulfate resistance of cementitious materials is dependent on its composition and on the pH of the environment. Portland cement with low C 3 A and low C 3 S performed well in all sulfate solutions.
Blended cements containing silica fume and fly ash (particularly at 40% replacement) showed a more superior performance Cited by: Influence of cement composition on concrete durability in chloride-sulfate environments.
By H.A.F. Dehwah. Abstract. Available from British Library Document Supply Centre-DSC:DXN / BLDSC - British Library Document Supply CentreSIGLEGBUnited KingdoAuthor: H.A.F. Dehwah. The compressive strength of blended cement concrete at 90 days of curing in air was similar to the compressive strength of Portland cement concrete (W-0 series), which was about 45 MPa.
At 28 days of curing these values were much different, the compressive strength is included in the range from 34 MPa (WS_L) to 43 MPa (W_L). For example, concrete exposed to tidal seawater will have different requirements than an indoor concrete floor. Concrete ingredients, their proportioning, interactions between them, placing and curing practices, and the service environment determine the ultimate durability and life of concrete.
In addition, supplementary cementitious material use is limited in any environment where concrete will be exposed to both deicer salts (C2) and very severe freezing and thawing (exposure class F3).
Current limitations include: slag – a maximum of 50 percent, fly ash – a maximum of 25 percent, and silica fume – a maximum of 10 percent. A durable concrete is one that performs satisfactorily under expected exposure conditions for specified life of the structure.
Various factors affecting the concrete durability are discussed below. Contents:Factors Affecting Durability of Concrete1.
Cement Content2. Aggregate Quality3. Water Quality4. Concrete Compaction5. Curing Period6. Sudheer S., Raghu Babu U., Kondraivendhan B.
() Influence of Metakaolin and Red Mud Blended Cement on Reinforcement Corrosion in Presence of Chloride and Sulfate Ions. In: Das B., Neithalath N. (eds) Sustainable Construction and Building. Concrete durability 1- Introduction Almost all the researchers in the field believe that chloride/ sulfate deterioration is the most serious problem for serviceability of concrete structures especially in marine environments .
Regarding the mechanism of sulfate attack, it should be noted that in the presence of the calcium. Durability is defined as the capability of concrete to resist weathering action, chemical attack and abrasion while maintaining its desired engineering properties.
It normally refers to the duration or life span of trouble-free performance. Different concretes require different degrees of durability depending on the exposure environment and properties desired.
INFLUENCE OF THE SO3 CONTENT OF CEMENT ON THE DURABILITY AND STRENGTH OF CONCRETE EXPOSED TO SODIUM SULFATE ENVIRONMENT Amin A. Hanhan ABSTRACT The objective of this investigation was to assess the influence of the SO3 content on the durability and strength of portland cement.
Four portland cements were used in this study. The cements had a. This study investigates the hydration, mechanical properties and durability characteristics of ground granulated blast-furnace slag (GGBS) – blended cements and mortars exposed to a combined sodium chloride–sulfate environment, at temperatures of 20°C and 38°C.
Composition of cement. Introduction Portland cement gets its strength from chemical reactions between the cement and water. The process is known as is a complex process that is best understood by first understanding the chemical composition of cement.
concerned with the durability performance of concrete in such environments. This unintentional ignorance of the aggressive service environment has led to a substantial reduction in the useful service life of concrete structures. The normal practice in the Arabian Gulf region is to use ASTM C Type V cement to resist deterioration due to.
Influence of pozzolana additive on Portland cement in chloride and sulfate environment at low temperature Ceramics – Silikáty 58 (2) () is a complex hydrate with formula Ca3Si(CO3)(SO4) (OH)6∙12(H2O) .In this few years the scientists came.
Strength and durability properties of cement mortar and concrete depends upon envionmental condition if cement species are in sea water than ions of salt may replace the calcium or silicate ion. Standard specification for ground granulated blast-furnace slag for.
Use in concrete and mortars. Annual book of ASTM Standards, ASTM International, West Conshohocken, Influence of cement composition on concrete durability in chloride–sulfate environments. Since many durability problems also can be related to poor quality control as well as special problems during concrete construction, the issue of construction quality and variability must also be.
The durability of concretes from the precast industry was studied in environmental conditions simulating wetting/ drying in a natural acidic environment. The industrial concretes were dry concrete and fluid concrete, both having cement content of kg/m 3.Portland cement concrete is durable in most natural environments; however, concrete is sometimes used in areas where it is exposed to substances that can attack and deteriorate it.
This publication discusses the effects of many substances on concrete and provides guidelines to protective treatments.This journal is designed to reflect current developments and advances being made in the general field of cement-concrete composites technology and in the production, use, and performance of cement-based construction word cement is interpreted in a wide sense, including not only Portland cement but also blended cements and other binding materials.