Group ID $($Circle please$)$:

What is the student trying to do with the aggregate sample as shown in the video?

a$.$ He is trying to find the specific gravity

b$.$ He is trying to find the flat and$/$or elongated particles

c$.$ He is trying to find the moisture content

d$.He$ is trying to find the unit weight

e$.$ He is trying to dry the aggregate sample

f$.)$ None of above

Given: The aggregate nominal max size is $28mm,$ which of the following are the appropriate dimensions for the

concrete cylinders used for lab compressive strength test? $(1^{\text{'}\text{'}}=25\mathrm{.}4(mm))$

a$.{12}^{\text{'}\text{'}}$ diameter, $6^{\text{'}\text{'}}$ height

b$.6^{\text{'}\text{'}}$ diameter, $6^{\text{'}\text{'}}$ height

d$.4"$ diameter, $8"$ height

e$.3^{\text{'}\text{'}}$ diameter, $6^{\text{'}\text{'}}$ height

C$.6"$ diameter, $8"$ height

The specified compressive strength $(f_c)20\mathrm{.}0$MPa is used in a concrete mix design. There are $15$ consecutive test data

available, and the standard deviation $=2\mathrm{.}00$MPa. What is the required strength $(\{$:$f_{cr})?$

$($a$.)22\mathrm{.}8$MPa

b$.23\mathrm{.}3$MPa

c$.22\mathrm{.}0$MPa

d$.22\mathrm{.}1$MPa

e$.20\mathrm{.}0$MPa

f$.$ None of above & your answer $=$

$F_{x_r}=2p+1\mathrm{.}342$

$=22\mathrm{.}78$~~$22\mathrm{.}8$

Given: In a concrete mix design, the ingredients and their properties are given below; the air content is $4\%$

What is the volume of the dry fine aggregate in terms of $m^3$ per $m^3$ of concrete?

a$.0\mathrm{.}480$

b$.0\mathrm{.}265$

c$.0\mathrm{.}215$

d$.0\mathrm{.}255$

e$.0\mathrm{.}305$

f$.$ none of above. The answer $=$

Given: Direct shear test on clean loosesand, ${}_n=400$kPa,${}_f=200$kPa. What is the internal friction angle, $?$

a$)=26\mathrm{.}6$

b$.=31\mathrm{.}0$

c$.=0\mathrm{.}50$

d$.=20\mathrm{.}6$

e$.=40\mathrm{.}5$

f$.$ None of above. The answer $=$

In a specific gravity test for coafse aggregate, the following data were obtained: weight in SSD $=1850g$; submerged weight

in water $=1150g$; water density at $23C=0\mathrm{.}99757\frac{g}{c}{m}^3$; water temperature $=23C$; oven dry weight $=1800g.$ What is the

aparent specific gravity? $($keep $4$ significant figures$)$

$($a$).2\mathrm{.}571$

b$.2\mathrm{.}732$

c$.2\mathrm{.}657$

d$.2\mathrm{.}565$

e$.2\mathrm{.}769$

f$.$ None of above & your value $=$

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