Concrete Technology Lab
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Apparatus: - i IS Sieves no. C The standard cement should comply with following conditions of fineness as given by IS; 460-1978 and IS; 369-1976. There many apparatus and machines available at the concrete technology lab like Sieve Shaker, Compressive testing machine, Flexure Testing Machine, Compaction Factor Apparatus, Heat of Hydration apparatus, Permeability apparatus etc. Concrete Technology laboratory notebook is a primary record of research, so students have learned in their first year of courses.
Enumerate the methods to determine fineness of cement. Principle: - Flexural strength, also known as modulus of rupture, bend strength, or fracture strength, a mechanical parameter for brittle material, is defined as a material's ability to resist deformation under load. There many apparatus and machines available at the concrete technology lab like Sieve Shaker, Compressive testing machine, Flexure Testing Machine, Compaction Factor Apparatus, Heat of Hydration apparatus, Permeability apparatus etc.
Concrete Technology Lab - The length of the rollers shall be at least 10 mm more than the width of the test specimen. The ratio of d to the maximum particle size of aggregate shall be not less than three.
Apparatus: - i IS Sieves no. Brief Procedure: i ii iii Take 100 gm. Sieve through 90 micron IS Sieve for 15 minutes. Weigh the residue left on sieve. Rate of gain of strength. Rate of evolution of heat. Increases drying shrinkage of concrete. Different cements are ground to different fineness:The cement must be properly ground to be uniformly fine; otherwise the concretes will be of poor workability causing bleeding. C The standard cement should comply with following conditions of fineness as given by IS; 460-1978 and IS; 369-1976. D Disadvantage :- i Susceptible to air set. Test values and calculation 1 wt. For rapid hardening cement, the residue by mass on IS test sieve should not exceed 5 %. The fineness value of given sample of cement is ………………. Hence it can be used as ordinary Portland cement for concrete work. Questions: i ii iii iv v vi What does the fineness of cement indicate? What is maximum limit of fineness of cement for ordinary Portland cement? Enumerate the methods to determine fineness of cement. What is the field application of fineness test of cement? What are the disadvantages of fineness cement? How is the fineness expressed when using the 90 micron IS Sieve? Principle: - Flexural strength, also known as modulus of rupture, bend strength, or fracture strength, a mechanical parameter for brittle material, is defined as a material's ability to resist deformation under load. The transverse bending test is most frequently employed, in which a specimen having either a circular or rectangular cross-section is bent until fracture or yielding using a three point flexural test technique. The flexural strength represents the highest stress experienced within the material at its moment of rupture. Apparatus: - Flexural test machine Brief Procedure: - 1. Test specimens shall be prepared by moldings concrete to a beam section, curing and storing in accordance with standard procedure. The section of the beam shall be square of 100 mm or 150 mm. The overall length of the specimen shall be 4d to 5d. The ratio of d to the maximum particle size of aggregate shall be not less than three. Circular rollers manufactured out of steel having cross section with diameter 38 mm will be used for providing support and loading points to the specimens. The length of the rollers shall be at least 10 mm more than the width of the test specimen. A total of four rollers shall be used, three out of which shall be capable of rotating along their own axes. The inner rollers shall be equally spaced between the outer rollers, such that the entire system is systematic. The specimen stored in water shall be tested immediately on removal from water; whilst they are still wet. The test specimen shall be placed in the machine correctly centered with the longitudinal axis of the specimen at right angles to the rollers. For moulded specimens, the mould filling direction shall be normal to the direction of loading. The load shall be applied slowly without shock at such a rate as to increase the stress at a rate of. Load Reports:The Flexural strength of the concrete is reported to two significant figures. CONCRETE TECHONOLOGY LABORATRY 4CE8A Page 4.
The test specimen shall be placed in the machine correctly centered with the longitudinal axis of the specimen at right angles to the rollers. Questions: i ii iii iv v vi What does the fineness of cement indicate. The transverse bending test is most frequently employed, in which a specimen having either a circular or rectangular cross-section is bent until fracture or yielding using a three point flexural test technique. Test specimens shall be prepared by moldings concrete to a beam section, curing and storing in accordance with standard procedure. C The standard cement should comply with following conditions of fineness as given by IS; 460-1978 and IS; 369-1976. Weigh the residue left on sieve. Concrete Technology lab Manual free download. A total of four rollers shall be used, three out of which shall be capable of rotating along their own axes. For rapid hardening cement, the residue by mass on Concrete technology lab manual test sieve should not exceed 5 %. What is the field application of fineness test of cement?.
