1. Work in Extreme Weather Conditions: Concreting operations done at atmospheric temperature above 400 C, need special attention. IS 7861(part-1)-1975 gives the recommended practices that would result in concrete possessing improved characteristics in the fresh as well as hardened state. Good practices of concreting require special care with respect to following: Temperature control of concrete(…)
Concrete Technology
Concrete Technology provides information on concrete and its properties, mix design, cracking, durability, high strength, prestressed concrete, precast concrete, fresh concrete ,hard concrete, Ready mix, SCC, special types of concrete, sulphate attack etc.
ACHIEVING DURABILITY FOR CONCRETE STRUCTURES
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: i) The structure should also be designed for environment loads and detailing done. ii) (…)
BENEFITS & ADVANTAGES OF SELF COMPACTING CONCRETE
Self compacting concrete (SCC) can be classified as an advanced construction material. The SCC as the name suggests, does not require to be vibrated to achieve full compaction. This offers following benefits and advantages over conventional concrete. Improved quality of concrete and reduction of onsite repairs. Faster construction times. Lower overall costs. Facilitation of introduction(…)
PROPERTIES OF HARDENED SELF COMPACTING CONCRETE
Following are the properties of hardened self compacting concrete: 1. Compressive strength of Self Compacting Concrete In all SCC mixes compressive strengths of standard cube specimens were comparable to those of traditional vibrated concrete made with similar water -cement ratios – if anything strengths were higher. In-situ strengths of SCC are similar to those of(…)
MATERIALS FOR SELF COMPACTING CONCRETE
Following are the materials for self compacting concrete: Cement for self compacting concrete All types of cement conforming to EN 197 are suitable. Selection of the type of cement will depend on the overall requirements for the concrete, such as strength, durability etc., C3A content higher than 10% may cause problems of poor workability retention.(…)
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(…)
CONCRETE CRACK REPAIR EQUIPMENT
All equipment employed in the concrete crack repair operation must be inspected before, during, and after the repair project to ensure proper operation of the equipment, safety of the personnel involved in the project, and potential damage to the pavement due to equipment problems. Proper safety procedures in accordance with OSHA guidelines and common sense(…)
STANDARD CODES FOR CONCRETE ADMIXTURES
Standard Codes for concrete admixtures: Admixtures used should conform to the following relevant standard codes. In reinforced concrete, the chloride ion of any admixture used should not exceed 2% by weight of the admixture as determined in accordance with IS:6925 and the total chloride ion in all admixtures used in concrete mi shall not exceed(…)