CONSMAT FA4 PDF - Materials Science Past Paper

## CONSMAT_FA4_PAGE1 **The density of the water if its temperature is 21.1 degrees Celsius in kg per cubic meter?** Answer: 999.97 **Reduction of sample size for ASTM C29 shall be based on ASTM** Answer: C702 **The samples should be immersed in water for 24 hours plus or minus hours.** Answer: 4...

## CONSMAT_FA4_PAGE1 **The density of the water if its temperature is 21.1 degrees Celsius in kg per cubic meter?** Answer: 999.97 **Reduction of sample size for ASTM C29 shall be based on ASTM** Answer: C702 **The samples should be immersed in water for 24 hours plus or minus hours.** Answer: 4 **The formula A(B-C) where A is the mass of OD test sample in air, B is the mass of SSD test sample in air and C is the apparent mass of saturated test sample in water.** Answer: Relative density (OD) **The water volume in the pycnometer shall be approximately % before agitating.** Answer: 90 **Which of the following is the formula for relative density (OD) using volumetric procedure?** Answer: S1(3) 0.9975(R2-R1) **SSD means** Answer: The surface is dried and the moisture inside is retained **The apparatus needed for ASTM C127 are given except of one.** Answer: Le Chatelier (among Balance, Oven, Sieve) **The standard test method for relative density and absorption of coarse aggregates is?** Answer: ASTM C127 **The standard test method for relative density and absorption of fine aggregates is?** Answer: ASTM C128 **According to ASTM C128, the mass of the pycnometer filled to its calibrated capacity with water shall be in what temperature?** Answer: 23.0 ± 2.0 dC **The acronym OD means?** Answer: Oven dry **ASTM C131 method covers a procedure for testing of coarse aggregates with a maximum size smaller than mm.** Answer: 37.5 **The coarsest grading considered in ASTM C131 is mm.** Answer: A | Sieve | Weight Retained (g) | Percent Individual | Percent Cumulative | Percent Passing | |:---|:---:|:---:|:---:|:---:| | 4.75 mm | 31.5 | 5.9233 | 5.9233 | 94.0767 | | 2.36 mm | 67.6 | 12.7115 | 18.6348 | 81.3652 | | 1.18 mm | 96.5 | 18.1459 | 36.4807 | 63.2193 | | 600 um | 111.1 | 20.8913 | 57.6721 | 42.3279 | | 300 um | 60.5 | 11.3765 | 69.0485 | 30.9515 | | 150 um | 115.6 | 21.7375 | 90.7860 | 9.2140 | | 75 um | 17.7 | 3.3067 | 94.0767 | 5.9233 | **pan** | 31.5 | 5.9233 | 100.0000 | 0.0000 | **Fineness Modulus of the aggregates** FM = (5.9233+ 18.6348 + 36.4807 +57.6721 +69.0485 + 90.7860) / 100 FM = 2.7885 **Aggregates should be dried before sieving** Answer: True **A sample with initial weight of 500g has a mass of 490g after drying, calculate the moisture content.** w = (500-490)/490 x 100 w = 2.0408% **Oven is allowed as the drying machine for determination of moisture content.** Answer: True **The sample is thoroughly dry when further heating causes, or would cause, less than % additional loss in mass.** Answer: 0.1 **A sample with initial weight of 1.22 kg has a mass of 1.12 kg after drying, calculate the moisture content.** w= (1.22-1.12)/1.12 x 100 w = 8.9286% **A sample with initial weight of 10.6g has a mass of 9.8g after drying, calculate the moisture content.** W = ( 10.6-9.8 ) / 9.8 x 100 w = 8.1633% **Type of alcohol that can be used to help dry the aggregates** Answer: Anhydrous denatured alcohol **The sample size required for sample with nominal maximum size of No. 4 sieve is?** Answer: 0.5 kg **Why is it important to test the moisture content?** Answer: All of the above (Affect the workability of concrete mix, Affect the water-cement ratio needed for concrete, Affect the strength of concrete) **To determine the volume of the container, it is filled with and using the density, and weight, volume can be calculated.** Answer: Water **A container with a volume of 0.01374 cu.m. has a weight of 7.4 kg, if the weight of the container and the aggregate is 31 kg, determine the bulk density.** (31-7.4) / 0.01374 = 1717.6128 kg/m³ **Balance should be accurate to 0.1% of the test load or kg.** Answer: 0.05 **Fineness modulus of the aggregates affect the workability of concrete** Answer: True ## CONSMAT_FA4_PAGE2 **Sieving duration must be sufficient so that not more than by mass of the material retained on any individual sieve will pass that sieve in 1 minute of sieving.** Answer: 1% **When sieving, the bottom of the sieve should be ** Answer: Pan **The first method in checking the grading of aggregates is?** Answer: Reduction of sample size **Concrete with lower FM is easier to finish** Answer: True **Moisture content of aggregates is important in concrete design mix** Answer: True **The safe minimum temperature of aggregates for handling is?** Answer: 50 degrees Celsius **The sample size required for sample with nominal maximum size of 6 inches is?** Answer: 50 kg **Igniting the alcohol is allowed to fasten the drying process** Answer: True **Moisture content of aggregate is limited to 5%** Answer: False** **A sample with initial weight of 4.2 kg has a mass of 4.08 g after drying, calculate the moisture content.** w% = ( 4.2-4.08 ) / 4.08 x 100 = 2.9412% **Balance powered by batteries is allowed to be use** Answer: True** **Balance for determining the bulk density of aggregates should be accurate to % or at least kg.** Answer: 0.01%, 0.5 **Density is equal to over ** Answer: Mass over volume **To compact the aggregates, the tool used is?** Answer: Tamping rod **Importance of specific weight of aggregates** Answer: All of the above (Used for Design Mixture Calculation, Used for Purchase Agreements, Used for Computation of Percentages of Voids) **ASTM C29 is applicable only for aggregates not exceeding mm in nominal size** Answer: 125 **Shape of coarse aggregate most suitable for self-compacting concrete** Answer: Rounded **According to ASTM C128, the mass of the pycnometer filled to its calibrated capacity with water shall be in what temperature?** Answer: 23.0±2.0dC **The apparatus needed for ASTM C127 are given except of** Answer: Le Chatelier (apparatus needed: Balance, Oven, Sieve) **Density of the material is equal to its mass over _?** Answer: Volume **In the formula given, what is B -?** Relative Density (Specific Gracity)(OD) = Answer: Mass of pycnometer filled with water **The maximum temperature of aggregates for sage handling is degrees Celsius?** Answer: 50 **The formula A/(B-C) where A is the mass of OD test sample in air, B is the mass of SSD test sample in air and C is the apparent mass of saturated test sample in water.** Answer: Relative density (OD) **The time needed for Los Angeles Apparatus to perform abrasion test is approximately?** Answer: 15 minutes **The maximum number of charges needed is?** Answer: 12 **The first method for ASTM C131 test is?** Answer: Washing of samples **The finest grading considered as ASTM C131 is** Answer: D **The finals sample shall be weighed to the nearest g.** Answer: 1 **The rotation of the drum of Los Angeles Apparatus is ?** Answer: 30-33 rpm **The total mass of charge needed for sample grading A is ** Answer: 5000 g **In accordance with ASTM C131, grading A should have a sample weight of to sieves opening of 37.5, 25, 19 and 12.5?** Answer: 1250 g **Minimum sample mass for nominal maximum size of aggregate of 150mm** Answer: 1250 g **Moisture content of aggregates will affect** Answer: All of the above (concrete's workability, strength, porosity) **Minimum sample mass for nominal maximum size of aggregate of 25mm** Answer: 4 **Equipment needed to get the moisture content of aggregates?** Answer: All of the above (Balance, Oven, Container) **How many layers of coarse aggregates needed for the determination of bulk density?** Answer: 3 **Coarse aggregate is also known as?** Answer: Graba **Number of strokes needed for each layer of aggregates in accordance with ASTM C29** Answer: 25 ## CONSMAT_FA4_PAGE3 **Is it allowed to wash the materials after abrasion is performed?** Answer: Yes **The rejected sample after the abrasion test is considered those passing No. sieve.** Answer: 12 **ASTM C131 or the abrasion test for coarse aggregates measure the resistance of coarse aggregates to?** Answer: Degradation **The standard test method for total evaporable moisture content of aggregate by drying is based on ASTM ** Answer: C566 **The moisture content of the sample 100 multiplied by (mass of the original sample minus mass of the dried sample) divided by ** Answer: Mass of the dried sample **Using the Le chatelier Flask, the amount of fine aggregated needed is plus or minus 5?** Answer: 55 **The ASTM standard for checking the grading of aggregates used for concrete is?** Answer: ASTM C136 **Higher value of fineness modulus means the aggregate is coarser** Answer: True **Filipino term for fine aggregates** Answer: Buhangin **To compact the aggregates the tool used is?** Answer: Tamping rod **Obtaining the sample should be based on ASTM ** Answer: D75 **How many strokes needed for each layer of aggregates for compaction in determining the bulk density?** Answer: 25 **The density of the water if its temperature is 15.6 degrees Celsius in kg per cubic meter?** Answer: 999.01