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 filler, it is a necessary component that defines the concrete’s thermal and elastic properties and(…)
Aggregates
HOW COARSE AGGREGATES AFFECT MIX DESIGN?
Coarse Aggregate Properties affecting Mix Design Strength Maximum size of coarse aggregate: Maximum size of aggregate affects the workability and strength of concrete. It also influences the water demand for getting a certain workability and fine aggregate content required for achieving a cohesive mix. For a given weight, higher the maximum size of aggregate, lower(…)
AGGREGATE CRUSHING VALUE
AIM To determine the aggregate crushing value of coarse aggregate. ”The aggregate crushing value gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load . With aggregate crushing value 30 or higher’ the result may be anomalous and in such cases the ten percent fines value should be determined(…)
RECYCLED AGGREGATE CONCRETE
To obtain good quality concrete using recycled aggregate it is necessary to follow the minimum requirements defined by the respective Building Standards. Acceptable properties of aggregates are an elemental base for concrete quality, however adequate mix proportions and concrete production methods are highly important in concrete quality too. Recycled aggregates composed of original aggregates and(…)
DETERMINATION OF AGGREGATE IMPACT VALUE
DETERMINATION OF AGGREGATE IMPACT VALUE AIM: (i) to determine the impact value of the road aggregates; (ii) to assess their suitability in road construction on the basis of impact value. APPARATUS: The apparatus as per IS: 2386 (Part IV) – 1963 consists of: (i) A testing machine weighing 45 to 60 kg and having(…)