QUALITY MANAGEMENT SYSTEMS IN CONCRETE CONSTRUCTION

Quality management systems in concrete construction should be the essential part of the construction project. Quality management system is nothing but a set of documents that provides detailed guidelines on quality management of concrete construction. It establishes systematic way of ...

FACTORS AFFECTING CONCRETE CUBE & CYLINDER STRENGTH RATIO

The relation between compressive strength of concrete cube and cylinder is complex. The various factors including inherent variations in concrete quality and comparison between cube and cylinder strength affects the strength ratio. Factors affecting Concrete Cube and Cylinder Strength Ratios ...

AVOIDING COMMON CONCRETING PROBLEMS

There are a number of problems which can occur in concrete as a result of improper mixing, placing, or curing. The following are common problems that are easily avoided if proper procedures are followed. Segregation is the tendency of the various ...

TYPES OF CHEMICAL ATTACKS ON CONCRETE STRUCTURES

Chemical attacks on concrete structures causes deterioration of structure and its durability is affected. The life of structure reduces and it can lead to failure of structures. The various types of chemical attacks and their effects on concrete structures are ...

EFFECTS OF AGGREGATE PROPERTIES ON CONCRETE

Concrete is a mixture of cementitious material, aggregate and water. Aggregate is commonly considered inert filler, which accounts for 60 to 80% of the volume and 70 to 85% of the weight of the concrete. Although aggregate is considered inert ...

SELECTION OF DURABLE CONSTRUCTION MATERIALS

Achieving  durability for concrete structures: The  durable  concrete structures  are  to  be  conceptualized, specified,  designed,  contracted,  constructed  and  maintained.  To  achieve  the design  life  of  the  structure  at  reasonable  maintenance  cost,  the  following aspects are required to be taken care of: ...

BEHAVIOUR OF CONCRETE IN EXTREME FIRE

Behaviour of concrete in extreme fires Concrete does not ‘melt’ in the majority of extreme fire conditions but it could do so in conditions such as created by, for example, a thermic lance (steel burning in a pure oxygen environment). However, ...

EFFECT OF AIR ENTRAINED CONCRETE ON CONCRETE STRENGTH

Air entrained concrete has effects on compressive strength of concrete and its workability. Air entrained concrete increases the workability of concrete without much increase in water-cement ratio. Compressive strength of concrete is inversely proportional to workability of concrete. When ...

CAUSES OF CONCRETE FAILURE

Causes of Concrete Failure Corrosion is not the only source of failure. Many other sources cause deterioration on reinforced concrete structures; this must be kept in mind and understood well when an inspection is undertaken. These sources of failure include: • Unsuitable ...

FACTORS AFFECTING STRENGTH OF CONCRETE

FACTORS AFFECTING CONCRETE STRENGTH Concrete strength is effected by many factors, such as quality of raw materials, water/cement ratio, coarse/fine aggregate ratio, age of concrete, compaction of concrete, temperature, relative humidity and curing of concrete. 1. Quality of Raw Materials: Cement: Provided the ...