# 工程材料學 期中考題目 急!!

a 15in long member deforms to a length of 26in .when subject to an axial force what is the strain.

Define poisson's ratio.

draw typical strain diagram for aluminum and rock.

explain the difference between apparent and bulk specific gravity.

how is fineness modulus measured,and does it represent?

a sieve analysis using sieves No.100, No.50,No.30,No.16,No.8,No.4 the fineness modulus is found to be equal to 3. What is the average size of the sample?

indicate half-sieve

what is the maximum size of fine aggregate?

the specific gravity and bulk density of an aggregate are 2.6 and 95 pcf respectively. find the loose volume of a 190-lb sample.

what are the four conditions of moisture in aggregate?

name three common mineral

name three common types of rocks used as aggregates

a sample of fine aggregate with a specific gravity of 2.6 has bulk density of 105 pcf. find the void content

a sample of gravel weighs 420g .its oven-dry weight is 400g . what is the moisture content.

### 1 個解答

• 7 年前
最佳解答

a 15in long member deforms to a length of 26in .when subject to an axial force what is the strain.

\$\$\$\$\$\$\$ strain = (26-15)/15 = 11/15 = 73.33%

Define poisson's ratio.

draw typical strain diagram for aluminum and rock.

\$\$\$\$\$

http://aluminium.matter.org.uk/content/media/image...

http://www.webpages.uidaho.edu/~simkat/course_mate...

explain the difference between apparent and bulk specific gravity.

\$\$\$\$\$\$

apparent = without voids

bulk = with voids

\$\$\$\$\$\$ aggregates of certain size range is missing

how is fineness modulus measured,and does it represent?

\$\$\$\$\$\$

fineness modulusis measured by Summing up the values of Cumulative

%Retained of the sieves No.100, No.50,No.30,No.16,No.8,No.4 and then be devided by 100 and expressed in decimal to 0.01

A larger fineness modulus means the aggregate is finer, smaller means coarser.

a sieve analysis using sieves No.100, No.50,No.30,No.16,No.8,No.4 the fineness modulus is found to be equal to 3. What is the average size of the sample?

\$\$\$\$\$\$\$\$\$ the average size = No.30 sieve size

indicate half-sieve

\$\$\$\$\$\$\$\$

standard sieve with half height, Ex. for a 8" sieve

Full Height

Overall height = 2-5/8"

Depth to cloth = 2" (50 mm)

Half Height

Overall height = 1-5/8"

Depth to cloth = 1" (25 mm)

what is the maximum size of fine aggregate?

\$\$\$\$\$ 3/8"

the specific gravity and bulk density of an aggregate are 2.6 and 95 pcf respectively. find the loose volume of a 190-lb sample.

\$\$\$\$\$\$ the loose volume of a 190-lb sample = 190/95 = 2 cubic foot

2013-10-26 14:57:14 補充：

a sample of fine aggregate with a specific gravity of 2.6 has bulk density of 105 pcf. find the void content

\$\$\$\$\$ void = [ 2.6 - (105/62.4)] / 2.6 = 35.28%

2013-10-26 18:38:55 補充：

a sieve analysis using sieves No.100, No.50,No.30,No.16,No.8,No.4 the fineness modulus is found to be equal to 1. What is the average size of the sample?

\$\$\$\$\$\$\$\$\$ the average size = No.100 sieve size

2013-10-26 18:39:13 補充：

a sieve analysis using sieves No.100, No.50,No.30,No.16,No.8,No.4 the fineness modulus is found to be equal to 2. What is the average size of the sample?

\$\$\$\$\$\$\$\$\$ the average size = No.50 sieve size

2013-10-26 18:39:45 補充：

a sieve analysis using sieves No.100, No.50,No.30,No.16,No.8,No.4 the fineness modulus is found to be equal to 4. What is the average size of the sample?

\$\$\$\$\$\$\$\$\$ the average size = No.16 sieve size