The objective of these experiments is to determine specific gravity, absorption capacity, and fineness modulus of a f ine aggregate sample and to plot a gradation curve for the sample. The scope of the experiment was limited to one aggregate sample only. In determining the SSD and oven-dry weights needed for calculation of specific gravities, a conical mold was used to reach an SSD condition and the sample was later dried in an oven. Sieve analysis determined the particle size distribution by sifting the aggregate through a series of eight sieves of different sixes by use of a mechanical shaker.
Part B used sieves to d etermine the r elative size of particles in the aggregate. Specific gravity is the ratio of the mass of a given volume of material to the mass of an equal volume of water. The water c ontent of a concrete mixture can a ffect its strength, durability, and cost. The fineness modulus is an i ndex n umber that is roughly proportional to the average si/e of the particles in a g iven aggregate, w hich a ffects a mixture’s gradation. Gradation is the distribution of particle si/c w ithin a given sample of material and affects economy, d urability, workability, and shrinkage in concrete.
Loose sand was cleaned from around the base and the m old was r emoved by l ifting it v ertically. When the sand slumped slightly, it i ndicated that it had reached a s urface dry c ondition. If the sand retained the mold shape, it i ndicated the sand was in a wet c ondition. This process was repeated u ntil an appropriate slump indicated SSD c ondition had b een achieved (Figure 4).
Compare And Contrast Sample Essay
H2>SAMPLE ESSAY 1: Columbia, Athlete and Musician (sailing and bass guitar) Write a chapter from your autobiography. Chapter 34: One Memorable Sailing Practice The suns glare off the water forces my watery eyes to close even more. Spray leaps over the bow and blocks my vision as it slams into me like hundreds of little pebbles. The salt water has irritated my eyes enough already, but I am only ...
Figure 2: Conical mold f illed with sand Figure 3: Sand tamped with rod Figure 4: Slump indicated SSD condition 3. 4. 5. A pproximately 400 g of the SSD aggregate was t aken. The exact w eight of SSD sample (D) was recorded.
