UNIT 4 Flashcards
is used to test the mechanical
properties (tension, compression etc.) of a given test specimen by exerting
tensile, compressive or transverse stresses.
Universal testing machine (UTM)
measures how strong it is (tensile strength) how stretchy it
is (elongation), and how stiff it is (tensile modulus)
Tensile Test
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 breaks
Compression Test
Similar to a tensile test - you pull apart two
materials that have been bonded together
Adhesion Tests (Peel test)
usually performed to measure the
flexural strength and modulus of some types of materials and
products.
Bend testing (flexural testing)
UTM machine is designed to test a wide range of materials, including,
but not limited to
Reinforcing Steel bars
Steel Rope
Concrete cylinder/cube/beam sample
Concrete Hollow blocks
Foam
A universal testing machine consists of
two main parts :
- Loading Unit
- Control Unit
The arrangement of the test specimen and
the exertion of the load is held in the_______
loading
unit
The variations in the application of the
load and the corresponding test result are
obtained from the _______.
control unit
a pre-cast hollow building unit with cells
composed of Portland Cement, suitable aggregates, with or without
inclusions of other materials
Concrete Hollow Blocks (CHB)
_____are innovative
building products that are used as walls in building construction
Concrete hollow blocks
concrete hollow blocks
have an inner void area which is greater than 25% of their gross area and
are available in various sizes and shapes. T or F
T
used by the Romans as early as 200 B.C. to bind
shaped stones together in the construction of buildings
Concrete mortar
During the reign of
the ___________, in 37-41 A.D., small blocks of precast
concrete were used as a construction material in the region around present day ________, _________
Roman emperor Caligula, Naples, Italy
It was not until ______ that the English stonemason _________ developed Portland cement, which became one of the key
components of modern concrete.
1824, Joseph Aspdin
A building made of concrete hollow blocks provides comfortable interiors due
to _________.
thermal insulation
_________ also make the building soundproof or at least keep the
noise at bay due to the hollow nature of the block.
Hollow blocks
can be used in the construction of commercial and residential
buildings, internal partition walls, and boundary walls, for architectural
decoration, and on the rooftop for heat protection
Hollow blocks
__________such as Portland Cement (ASTM C150), Blended
Cements (ASTMC595), Hydrated Lime Type S (ASTM C207), Pozzolans
(ASTM C618) may be used.
Cementitious materials
________ should be free from
significant amount of deleterious impurities
water
Suitable proportion of aggregate to cement must
be found by testing T or F
T
commonly being used in building
construction such as walls, partitions, fences or dividers. They are
ranging from 3 to 6 in. and are not capable of super-imposed load
and are carrying their own weights only
Non-load bearing CHB
are blocks whose thickness ranging from 6 to 8
inches or more, and capable of carrying super imposed load aside
from its own weight. This may be used in exterior walls below grade
and for un-plastered exterior wall above grade that may or may not
be exposed to weather.
Load bearing CHB
STANDARD SPECIFICATION FOR HOLLOW LOAD-BEARING
CONCRETE MASONRY UNIT
ASTM C90
STANDARD SPECIFICATION FOR NON-LOAD-BEARING
CONCRETE MASONRY UNIT
ASTM C12
SAMPLING AND TESTING OF CONCRETE HOLLOW BLOCK
ASTM C14
Specimens shall be representative of the whole lot of units from which they are selecte
Sampling of CHB
___Quality Test for every 10,000 units CHB or fraction thereof
____ units of CHB per 1 Quality Test
1, 6
Quality Test
1. ___________– 3 units of CHB
2. ___________ – 3 units of CHB
Compressive Test , Absorption Test
Testing of CHB
Dimension Measurements
Compressive Strength Test
Absorption Test
The tests are performed so as to determine the actual
percentage of water and the absorption characteristics of
the concrete when subjected in a saturated condition
Absorption Test
