Quick-setting Micro-expansive Cement (LB-8)

I Definition of the Quick-setting Micro-expansive Cement (LB-8)

LB-8 quick-setting micro-expansive (sealing) cement is a kind of normal Portland special cement, which possesses properties of quick-setting, high initial strength, and micro-expansive.
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II Scope of Applications of the Quick-setting Micro-expansive Cement (LB-8)
nbsp;Suitable for mending the tunnel, culvert, underground of coal field, and such general underground projects in basement, air raid shelter.
nbsp;Suitable for joint sealing to chemical grouting in underground works.
nbsp;Suitable for quick-mending to surfaces defects of road, bridge, wall, and reinforcing to walls and cement structures works.

III Advantages of the Quick-setting Micro-expansive Cement (LB-8)
nbsp;Quick-setting: When the temperature is above 10,the setting time is no more than 80 seconds.
nbsp;High initial strength continued increasing in late strength.
nbsp;Micro-expansive after hydration reaction, it can seal firmly to various leaking, cracks, and holes.

IV Key Technical Indicators: as per Q (DJ) 18013-1996 Standard

Item Performance
Set time Initial set Final set
nbsp;≥ 18 sec. ≤ 60 sec.
Early strength 8 Mpa (1 hrs)
Expansion ratio 0.32%~0.8%
Water tightness (0.3 Mpa x 30 min) No seepage

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V Construction Procedure of the Quick-setting Micro-expansive Cement (LB-8)
1. Treatment at leak points 
Cement mortar
concrete
leak point
basement floor 2. Batching & blending 
Type I
Type II
water
quickly blend into paste (not exceeding 30sec)
LB-8II + sand, blend even
nbsp;Blend even
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3. Plugging & plastering Type I,  
Type II
basement floor  
4. Sprinkling & curing 

VI Package & Storage of the Quick-setting Micro-expansive Cement (LB-8)
nbsp;Product package, 5 kg / bag, 4 bags / box, 50 kg / bag
nbsp;The product shall be stored in a dry and ventilated warehouse for a storage period of 3 months.

Mix ratio (w/w)

Water cement ratio: 0.3 ~0.35