An Overview of Some Development in CONCRETE TECHNOLOGY
There has been rapid advances in concrete technology during the past three decades or so. The improvement in strength and other structural properties achieved earlier through the use of steel
Self Curing Concrete An Introduction
Excessive evaporation of water (internal or external) from fresh concrete should be avoided; otherwise, the degree of cement hydration would get lowered and thereby concrete may develop unsatisfactory properties
GREEN CONCRETE and GLOBAL WARMING
There are several causes for global warming including carbon dioxide emission from burning of fossil fuels for the purpose of electricity generation. Coal accounts for 93 percent of the emissions from
High Performance Concrete Admixtures
Admixtures are the ingredients in concrete which are other than the hydraulic cementitious material, water, aggregates or fiber reinforcement that are used as ingredients of a cementitious mixture to
RMC - A Revolution in Production of Concrete
Ready mixed concrete, by far the most common form of concrete, accounts for more than half of all concrete consumption. Ready mixed refers to concrete that is batched for delivery from a central mixing plant instead of being mixed
Designing Reinforced Concrete Structures for Long Life Span
Innovation in construction industry is highly linked with development of advanced construction materials. In the recent two–three decades lot of research relating to how to enhance the life of reinforced concrete structures has been
Integral Watertight Concrete Structures- An Insight
Since the Stone Age mankind has struggled to keep the structures watertight, Even today’s struggle is on to deploy one or other kind of waterproofing system to achieve total water tightness of structures
Effect of Usage of Admixture in Concrete
Concrete consists of cement, sand, aggregate and water. Anything other than these if added in concrete either before or during mixing to alter the properties to our desired requirement are termed as admixtures. The use of admixtures offers certain beneficial effects to concrete like improved workability, acceleration or retardation of setting time, reduce
Self Compacting Concrete for Rafts and Retaining Walls
Self–compacting concrete can be defined as a category of High Performance Concrete that hasexcellent deformability in the fresh state and high resistance to segregation and can be
Reinforced Concrete:High-Strength Steel Fiber Reinforced Concrete
The combined use of silica fume having pozzolanic reaction and filler effect, and super-plasticizer will improve the interface of the materials, thereby enhancing the strength of the concrete, can lead to
Load Capacity: Concrete Types And How They Behave
Accurately calculating and predicting the pressure that poured concrete will exert on the formwork, is one of the most important tasks when planning on-site concrete works. Sure knowledge of the expected
Carbonation A Durability Threat for Concrete
The rate of carbonation depends on porosity (for CO2to Diffuse) & moisture content of the concrete (for dissolution of solid Ca(OH)2). The diffusivity of CO2 depends upon the pore system of hardened
Prestressed Concrete in Building: Advantages and Economics
Prestressed concrete is a method for overcoming concrete's natural weakness in tension. Prestressing tendons (generally of high tensile steel cable or rods) are used which produces a compressive stress
Conventional Vis–a–Vis Mineral Admixed Concrete
This article presents a comparison between conventional concrete and mineral admixed concrete to be used in the construction of cement concrete pavements. Mineral admixtures such as flyash
Ultimate Solution for Epoxy Flooring Finishes on Oil Contaminated Concrete Floor Substrates
Concrete contaminated substrates cause immense problems to the user over the years. Contaminationdue to fuels, oils, fats, grease, sugar are a combination of both organic and hydrocarbon based
Characteristic Analysis of Flyash and Micro Silica
Flyash is one of the promising pozzolanic materials that can be blended with Portland cement for the production of durable concrete and at the same time it is a value added product. Addition of flyash to Portland cement not only improves the strength of concrete, but also forms a calcium silicate hydrate (CSH) gel around the cement particles which is highly
Shear Strengthening of RC Beam by Externally Bonded Side Gfrp Strips
In recent years, several studies have been conducted to investigate the flexural strengthening of reinforced concrete (RC) members with fiber reinforced composite fabrics. Shear failure of RC members is disastrous and occurs with
Realistic Cable Modeling in Prestressed Concrete Structures
Concrete is perhaps the most important construction material due to its various added advantages. The major problem with concrete is that it is very weak in tension. To strengthen the concrete to withstand tensile stresses, reinforced
Effect of Temperature on rubber latex modified tertiary blended concrete
Extensive research work for decades is in progress throughout the globe in concrete technology in finding alternative materials which can partially or fully replace ordinary Portland cement (OPC) and
Strength Properties of Steel Fibre Reinforced Concrete
It has been estimated that several million tones of waste glasses are generated annually worldwide. The key sources of waste glasses are waste containers, window glasses, window screen, medicinal
Concrete Suitable for Higher Temperature
Concrete structures need repair and rehabilitation many a time as they get damaged due to excessive stresses due to unforeseen forces caused by man-made or natural disasters. But there are few situations in practice, where concrete is
Comparative Studies of Different Cements with Different Standards
The compressive strength of four cements (Three PPC and one OPC) was determined according to different international standard, BIS, BS, ASTM and Sri Lanka. The 28 days strength of one PPC is 53 MPa, the other two shows 48MPa when tested as per BIS. The 43 grade OPC also shows 50 MPa at 28 days. However, when tested as per BS & ASTM methods
Behavior of Prestressed Concrete Beams Using GFRP Wrapping
Comparative behavior of Prestressed concrete (PSC) beams subjected to two point loadings in terms of failure load, deflection and failure modes is evaluated. Effect of Glass Fiber Reinforced Polymer (GFRP)
Self Compacting Cocrete
Concrete mixtures having high workability and high cohesiveness will be self–compacting concrete. The self–compacting concrete (SCC) is defined as a flowing concrete that can be transported without any segregation and placed
Engineering of Self Compacting Concrete
One of the most important performance criteria for concrete is the fluidity at fresh state. Appropriate fresh state properties are achieved by engineering suitably the theology of concrete. Such engineering is achieved by
High Performance Concrete - Novel Approach with Pre blended Material
The development of high performance concrete is a giant step in making concrete a high-tech material with enhanced characteristics and durability. High performance concrete is an engineered concrete obtained through a careful
Concrete Containing More Than Two Admixtures
Concrete is a material often used in the construction of highrise buildings. In case of unexpected fire, the concrete elements such as columns, beams, etc. will be subjected to extreme temperatures and needs assessment of their
