Why flakiness and elongation test is done?
This test is used to determine the particle shape of the aggregate and each particle shape being preferred under specific conditions. The significance of flakiness & elongation index is as follows; Due to high surface area to volume ratio, the flaky and elongated particles lower the workability of concrete mixes.
What is the purpose of elongation index?
Necessity of Elongation Index Test Elongated particles have high ratio of surface area to volume which reduces the workability of concrete. If elongated particles are used for pavement base course construction, they may break down easily under heavy loads which will cause damage to the pavement.
What is effect of flaky and elongated aggregates?
The results reveal that the effect of elongated aggregates is more than flaky aggregates, on the characteristic compressive strength of concrete. Concrete with 1:1 ratio of flaky to elongated aggregates possesses minimum weight.
What is the purpose of doing shape test of aggregate?
objective Particle shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Rough-textured, angular, and elongated particles require more water to produce workable concrete than smooth, rounded compact aggregate.
What is the significance of flakiness index?
The Significance of Flakiness Index and Elongation Index Test of Aggregate. The test Flakiness index of aggregate is used to determine the particle shape of the aggregate specimen and each particle shape being preferred under specific condition.
What is the significance of flakiness index and elongation index?
Flakiness Index is the percentage by weight of particles in it, whose least dimension (i.e. thickness) is less than three-fifths of its mean dimension. Elongation Index is the percentage by weight of particles in it, whose largest dimension (i.e. length) is greater than one and four-fifths times its mean dimension.
What is flakiness and elongation index?
What is combined flakiness and elongation index test explain how do you find out combined flakiness and elongation value?
The Flakiness Index of aggregates is the percentage by weight of particles whose least dimension (thickness) is less than 0.6 times their mean dimension. The Elongation Index of aggregates is the percentage by weight of particles whose greatest dimension (length) is greater than 1.8 times their mean dimension.
What is flakiness and elongation?
How can we differentiate between flaky and elongated aggregates?
When the aggregate length is larger than its width and width is larger than its thickness then it is said to be flaky and elongated aggregates.
How are flakiness index and elongation index values determined in the laboratory discuss the importance of the test?
What is test flakiness?
A flaky test is an analysis of web application code that fails to produce the same result each time the same analysis is run.
What is the significance of Flakiness Index and Elongation Index? Flakiness Index is the percentage by weight of particles in it, whose least dimension (i.e. thickness) is less than three-fifths of its mean dimension.
What tests are done during pregnancy to check for abnormalities?
You may have ultrasounds performed at different times in your pregnancy to check for fetal growth, estimate your due date and look for any structural abnormalities in the baby. Additional testing during pregnancy may include amniocentesis, chorionic villus sampling (CVS), fetal monitoring, glucose testing and Group B strep culture.
When is an ultrasound used during pregnancy?
Ultrasound is used during the first trimester of pregnancy (usually at 11 to 13 weeks) to: perform the nuchal translucency test. Ultrasound is used during the second trimester of pregnancy (usually at 18 to 20 weeks) to: determine the sex of the baby, if possible, if you wish to know. Ultrasound is used during the third trimester of pregnancy to:
How accurate is multiple marker screening for pregnancy?
An ultrasound is used to confirm the milestones of your pregnancy and to check the fetal spine and other body parts for defects. An amniocentesis may be needed for an accurate diagnosis. Since multiple marker screening is not diagnostic, it is not 100 percent accurate.