The process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design. The proportioning of ingredient of concrete is governed by the required performance of concrete in 2 states, namely(…)
Mix Design Guide
RECOMMENDED CONCRETE MIXES FOR VARIOUS CONSTRUCTION
RECOMMENDED CONCRETE MIXES FOR VARIOUS TYPES OF CONSTRUCTION WORKS: Type of work App. Concrete Mix Max. size of aggregates (mm) Water for one cement bag batch (ltr) Total for dry aggregates For aggregates condition from dry to moist Best consistency Small precast work, fence posts, poles, garden furniture and other work of very thin sections(…)
MIX DESIGN OF HIGH STRENGTH CONCRETE
The properties of a high-strength concrete-mix with a compressive strength of more than 40 MPa is greatly influenced by the properties of aggregates in addition to that of the water-cement ratio. To achieve high strength, it is necessary to use lowest possible water-cement ratio, which invariably affects the workability of the mix and necessitates the(…)
MIX DESIGN OF ROLLER COMPACTED CONCRETE
Mix design proportioning methods for Roller Compacted Concrete RCC: Mix design proportioning methods for no slump concrete applicable for Roller Compacted Concrete. Materials Used in RCC mix design a) Cementitious materials: Cement content is generally low (typically 70 to 130 kg/m3). Any kind of Portland Cement (but low heat cement is a preferred type when(…)
FACTORS AFFECTING CHOICE OF CONCRETE MIX DESIGN
Concrete mix design is defined as the appropriate selection and proportioning of constituents to produce a concrete with pre-defined characteristics in the fresh and hardened states. In general, concrete mixes are designed in order to achieve a defined workability, strength and durability . The selection and proportioning of materials depends on: The structural requirements of(…)
HOW FINE AGGREGATES AFFECTS CONCRETE MIX DESIGN?
Fine aggregates affecting concrete mix design strength Gradation of fine aggregates The gradation of sand is given by sieve analysis. The sieve analysis is done by passing sand through a set of standard sieves and finding out cumulative passing percentage through each sieve. The IS 383 – 1970 -Table 4, (clause 4) classifies fine aggregates(…)
METHODS OF PROPORTIONING CONCRETE
The process of relative proportions of cement, sand, coarse aggregate and water, so as to obtain a concrete of desired quality is known as the proportioning of concrete. The proportions of coarse aggregate, cement and water should be such that the resulting concrete has the following properties: When concrete is fresh, it should have enough(…)
DESIGNED CONCRETE SPECIFICATIONS
Designed concrete are those for which the producer is responsible for selecting the mix proportions to meet the required performance as communicated by the specifier. Therefore it is essential that the specifier, in compiling the specification, takes account of: The uses of the fresh and hardened concrete The curing conditions The dimensions of the structure,(…)