Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

UNIT 4 CONS MAT > hdchdc > Flashcards

hdchdc Flashcards

1
Q

A Universal testing machine (UTM) is used to test the _________ properties (tension, compression etc.) of a given test specimen by exerting tensile, compressive or _________ stresses.

A

mechanical, transverse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The UTM has been named so because of the wide range of tests it can perform over different kind of materials. Different tests like ______ test, ______ test, ______ test, _____ test, ________ test, ______ test etc. can be performed with the help of UTM.

A

peel, flexural, tension, bend, friction, spring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

______________measures how strong it is (tensile strength) how stretchy it is (_____________), and how stiff it is (________ ________)

A

tensile test, elongation, tensile moduluS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

____________ is the exact opposite of a tensile test. It is where you compress an object until a certain load or distance has been reached or the product ________.

A

Compression test, breaks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

__________ is similar to a tensile test - you pull apart two
materials that have been bonded together.

A

adhesion tests ( peel test)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

__________ is usually performed to measure the flexural strength and modulus of some types of materials and products.

A

bend testing ( flexural testing)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

UTM machine is designed to test a wide range of materials, including, but not limited to

A

-reinforcing steel bars
-steel rope
-concrete cylinder/cube/beam sample
-concrete hollow blocks
-foam

RSCCF

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A universal testing machine consists of two main parts :

A
  • Loading Unit
  • Control Unit
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The arrangement of the test specimen and the exertion of the load is held in the ____________. The variations in the application of the load and the corresponding test result are obtained from the ___________.

A

loading unit, control unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The topmost part of the UTM and it is fixed.

A

Upper Crosshead

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Used to grip the upper end of the sample

A

upper grip

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

used to adjust the position of the lower crosshead

A

Screw

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Lower grip, together with the ________________ , it moves downward during tensile and peel/adhesive test.

A

lower crosshead

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

supports the test frame

A

column

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

lower head of the UTM and is one of the most important parts, it also has an upward and downward movement

A

lower crosshead

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

it is where the compression and bending tests take place

A

press plate/compression plate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

put the compression and bending test fixtures

A

working table

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

can be seen when the metal sheet is removed, test loading system

A

cylinder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

covers the internal part of the utm

A

metal sheet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

supports the whole utm

A

baseplate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

controls the upper and lower grips

A

grip control system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

brain of the computer where most calculations take place

A

control processing unit ( CPU)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

output device that displays information

A

computer monitor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

used to turn the machine by rotating the switch clockwise

A

power switch

25
Q

a fail-safe control switch that provides both safety for the machinery and for the person using the machinery

A

emergency stop

26
Q

used to ensure that the specified test RATE is accurately maintained throughout the test

A

digital controller

27
Q

____________________ is a pre-cast hollow building unit with cells composed of ________ Cement, suitable aggregates, with or without inclusions of other materials. Concrete hollow blocks are innovative building products that are used as _______ in building construction. They
have an inner void area which is greater than ____% of their ______ area and are available in various sizes and shapes. They are mainly used for their durability, low cost, speed of construction, and eco-friendliness besides others.

A

Concrete Hollow Blocks, portland, walls, 25, gross

28
Q

___________ was used by the Romans as early as 200 B.C. to bind shaped stones together in the construction of buildings.

A

concrete mortar

29
Q

During the reign of the Roman emperor _________, in 37-41 A.D., small blocks of precast concrete were used as a construction material in the region around present-
day ______, ______. It was not until _______ that the English stonemason ___________ developed Portland cement, which became one of the key components of modern concrete.

A

Caligula, Naples Italy, 1824, Joseph Aspdin

30
Q

A building made of concrete hollow blocks provides comfortable interiors due to ____________. The ______ in the hollow block does not allow outside heat or cold in the building, keeping the house cool in summer and warm in rainy season. Hollow blocks also make the building ___________ or at least keep the noise at bay due to the _________ nature of the block.

A

thermal insulation,air, soundproof, hollow

31
Q

Hollow blocks can be used in the construction of commercial and residential buildings, internal _______ walls, and _________ walls, for architectural decoration, and on the rooftop for ______ protection.

A

partition, boundary, heat

32
Q

One of the major advantages of concrete hollow blocks is their high ___________. Concrete hollow blocks are compacted by high __________ and ___________, which make the blocks very strong and able to withstand a high level of loading (for load-bearing CHBs). They also have high fire resistance and no ___________ which reduces their maintenance cost.

A

durability, pressure, vibration, salinity

33
Q

CHB reduces the construction cost.

A

YUHZ

34
Q

CHBs are hard to install due to their uniform size and shape. They also have big weight which does facilitates rapid construction work.

A

F, easy, less weight, easy to install

35
Q

Even unskilled laborers can easily work with hollow blocks.

A

T

36
Q

concrete hollow blocks does not offer earthquake resistance

A

False, it offers superior earthquake resistance

37
Q

concrete hollow blocks does not offer earthquake resistance

A

False, it offers superior earthquake resistance

38
Q

a part of concrete hollow blocks which connects two faces/shell

A

web

39
Q

The hanging part of the CHB

A

ears

40
Q

Composition of concrete masonry units

Cementitious materials such as ________ Cement (ASTM C150), _______ Cements (ASTM C595), ________________ (ASTM C207), ____________ (ASTM C618) may be used.

A

Portland, blended, hydrated lime type S, pozzolans

41
Q

Composition of concrete masonry units

Mineral aggregates may consist of ______ sands or _________ sands in different weights such as ________ (ASTM C33) and ____________ (ASTM C331).

Aggregates: Maximum particle size of coarser aggregates passing sieve _______ (3/8 in). The use of Masonry cement is also being practiced.

A

natural, manufactured, Normal, Light Weight, 9.5 mm

42
Q

in concrete masonry units, _______ should be free from significant amount of deleterious impurities.

A

water

43
Q

Note: There is a need to conduct __________ to come up with the right mix proportions. Only drinking and of good quality water should be used to mix the concrete. Recommended water-cement ratio _____.

A

trial mix, 0.5

44
Q

Cement-Aggregate Ratio: Suitable proportion of aggregate to cement must be found by testing. Common ratios/mix proportion are (Cement: Aggregates):

Load Bearing = _______ up to ______
Non Load Bearing = ________ up to _______
Mortar is design at ( cement:aggregates) = _____ up to ______

A

1:2 1:3
1:6 1:8
1:2 1:3

45
Q

_____________ CHB are commonly being used in building construction such as walls, ______, fences or dividers. They are ranging from _______. and are not capable of super-imposed load and are carrying their own weights only.

A

non-load bearing, partitions, 3-6 in.

46
Q

______________ are blocks whose thickness ranging from __________ inches or more, and capable of carrying super imposed load aside from its own weight. This may be used in _______ walls below grade and for __________ exterior wall above grade that may or may not be exposed to weather.

A

Load bearing CHB, 6-8. , exterior, un-plastered

47
Q

STANDARD SPECIFICATION FOR HOLLOW LOAD-BEARING
CONCRETE MASONRY UNITS

A

ASTM C90

48
Q

STANDARD SPECIFICATION FOR NON-LOAD-BEARING
CONCRETE MASONRY UNITS

A

ASTM C129

49
Q

sampling and testing of conrete hollow blocks

A

ASTM C140

50
Q

Standard Specifications for Item _____ – Masonry Works

A

DPWH, 1046

51
Q

Specimens shall be representative of the whole lot of units from which they are selected, 1 quality test for every __________ units of CBH or fraction thereof, and _______ units of CHB per 1 quality test.

A

10,000, 6

52
Q

In testing quality of CHB, __ units is for compressive test, and 3 units for _________ test

A

3, absorption

53
Q

Give the three testing of CHB

A
  • Dimension Measurements
  • Compressive Strength Test
  • Absorption Test
54
Q

In compressive test strength

Apply the load up to _______ of the expected maximum
load at any convenient rate and adjust rate of loading such that the remaining load is applied in not less than ____ or more than _____ min. Then record the data.

A

1/2, 1 , 2

55
Q

What is the formula for minimum compressive strength?

A

maximum load/minimum net area in ( MPa)

56
Q

The minimum net area is based on values obtained in ___________ and _________ test

A

absorption, unit weight

57
Q

The tests _________ are performed so as to determine the actual percentage of water and the absorption characteristics of the concrete when subjected in __________ condition.

A

absorption test, saturated

58
Q

In absorption test

  1. Weigh specimen within ____ hours upon arrival @ Lab.
  2. Immerse completely the test specimen in a container with water at room temperature of
    _____ to ____ ºC for _____ hours.
  3. Remove from the water and allow to drain for one (1) minute by placing them on a _____ mm or coarser wire mesh. Wipe visible surface water with damp cloth and
    immediately weigh.
  4. Weigh the specimens while suspended by a metal to completely _________ in water.
  5. Dry the specimen in a ventilated oven to a temperature of _____ ºC to _____ ºC for not less than 24 hours to a constant weight and obtain the dry weight.
A

72

15.6 26.7, 24

9.5 mm

submerged

100 115

UNIT 4 CONS MAT (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions