Construction Mortar

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Chapter 5

• Construction Mortar

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Chapter 5
5. 3 Technical Properties

• Mobility (consistency)
• Water retentivity
• Strength
• Durability

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Technical Properties

• Technical properties of mortar including
  Mobility (consistency), Water retentivity,
  Strength, Durability, Adhesion stress and
  Distortion
• In this chapter, we will mainly introduce
  Mobility (consistency), Water retentivity,
  Strength.

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Mobility (consistency)
Definition
Mobility is the property of flowing of fresh
mortar under the influence of gravitation and by
the external force.
Influencing factors
Similar to effective factors of concrete
workability and related to water dosage, binding
material quantity and property of aggregate.
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Mobility (consistency)
Testing

• Index the sinking degree
• Apparatus consistometer of mortar

Fig5.3.1 consistometer of mortar
Technical Properties
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Mobility (consistency)
Method and Process
Put the fresh mortar in taper canister evenly
under conoid
Turn zero
Loosen setscrew
The conoid will sink intomortar in 10 seconds
The deeper, the greater of mobility
The sinking depth of conoidis the sinking degree
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Mobility (consistency)
Choice of mobility

• Choosing of the mobility of mortar according to
• Kinds of masonry
• Construction condition
• Climate condition
• Choices of the mobility of mortar referring to
  Tab5.3.1

E.g. porous masonry, exothermic climate, great
mobility of mortar
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Table 5.3.1 Mobility of Construction Mortar(the
sinking degree mm)
Kind of Masonry Dry climate Cold climate Plaster project Mechanical construction Manual operation
Fired normal brickwork 80-90 80-90 Base 80-90 110-120
Stonework 70-80 70-80 Substrate 70-80 70-80
Normal concrete hollow block 40-50 40-50 Face-layer 70-80 90-100
Lightweight aggregate concrete block 30-40 30-40 Plaster-slurry face-layer - 90-120