1. Chapter 5 Construction Mortar

2. Chapter 5 §5. 3 Technical Properties Mobility (consistency) Water retentivity Strength Durability

3. 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.

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

5. Index: the sinking degree Apparatus: consistometer of mortar Testing Fig5.3.1 consistometer of mortar Mobility (consistency)

6. 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 Method and Process Mobility (consistency)

7. 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 Choice of mobility E.g. porous masonry, exothermic climate, great mobility of mortar Mobility (consistency)

8. Table Mobility of Construction Mortar (the sinking degree: mm) 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 Base 80 - 90 110 - 120 Stonework 70 - 80 Substrate 70 - 80 Normal concrete hollow block 40 - 50 Face- layer 70 - 80 90 - 100 Lightweight aggregate concrete block 30 - 40 Plaster- slurry face-layer － 90 - 120