HIGH-STRENGTH V/S. HIGH-PERFORMANCE CONCRETE

High-Strength versus High Performance Concrete High strength concrete and high-performance concrete are not synonymous because strength and performance of concrete are different properties of concrete. High-strength concrete is defined based on its compressive strength at a given age. During 1970s, any concrete mixtures which showed 40 MPa or more compressive strength at 28 days were(…)

CORE SAMPLING AND TESTING OF CONCRETE

While Rebound Hammer, CAPO/Pullout, Windsor probe and ultrasonic pulse velocity tests give indirect evidence of concrete quality, a more direct assessment on strength can be made by core sampling and testing. Cores are usually cut by means of a rotary cutting tool with diamond bits. In this manner, a cylindrical specimen is obtained usually with(…)

ROLE OF DESIGN ENGINEER IN GEOTECHNICAL INVESTIGATIONS

Structural Design Engineer play an important role not only in making a structure safe structurally, but also by ensuring that the site where the construction has to be carried out is safe for the given structure. It becomes very much essential for a geotechnical investigation to know the type of structure, surroundings of the proposed(…)

REQUIREMENTS OF CONCRETE REPAIR MATERIALS

Besides being of compatible properties, repair materials for cement, concrete/mortar shall also be easy to apply and require no attention after the repair has been applied. The essential parameters for deciding upon a repair material for concrete are: Low shrinkage properties Requisite setting/hardening properties Workability Good bond strength with existing substrate Compatible coefficient of thermal(…)

FACTORS AFFECTING CONCRETE MIX DESIGN STRENGTH

Factors that affects the concrete mix design strengths are: Variables in Mix Design A. Water/cement ratio B. Cement content C. Relative proportion of fine & coarse aggregates D. Use of admixtures A. Water/cement ratio Water to cement ratio (W/C ratio) is the single most important factor governing the strength and durability of concrete. Strength of(…)

PROPERTIES OF MANUFACTURED SAND

Manufactured Sand is a sand produced from crushing of granite stones in required grading to be used for construction purposes as a replacement for river sand. Read More about Manufactured Sand. The properties of Manufactured sand used for construction are: Higher Strength of concrete: The manufactured sand has required gradation of fines, physical properties such(…)

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(…)

MANUFACTURED SAND (M-SAND) IN CONSTRUCTION

Manufactured sand is a substitute of river for construction purposes sand produced from hard granite stone by crushing. The crushed sand is of cubical shape with grounded edges, washed and graded to as a construction material. The size of manufactured sand (M-Sand) is less than 4.75mm. Why Manufactured Sand is Used? Manufactured sand is an(…)