Product Data Sheet Show all documents
Unicell® 25

Unicell® 25

Prebagged High Build, Waterproof Class 25 Repair Mortar

Unicell® 25 is a prepacked vinyl acetate copolymer modified mortar requiring only the addition of clean water to produce a mortar suitable for concrete repair and rendering. The material conforms to the Hong Kong Housing Authority specification for Class 25 repair mortar system. The performance of the product is certified under the Hong Kong Concrete Institute (HKCI) Product Conformity Certification Scheme PCCS-RM : Class 25. It can be applied in thick section and is suitable for structural and non-structural application. Layers of 50 mm can be achieved depending upon substrate profile and technique. Greater thickness may be possible when applying material into pockets. Successive layers can be built up to achieve the required thickness once the previous layer has become firm.  

  • Prebagged giving greater confidence
  • Single pack requiring only the addition of water
  • Easy to apply on overhead surfaces
  • Easy to achieve smooth surface finish
  • Suitable for structural repairs
  • Low VOC
  • Can contribute to LEED certification
Product Data Sheet Show all documents

Usage

  • Thick section concrete repairs to vertical and overhead surfaces
  • Can be used internally and externally
  • Structural and cosmetic repairs to buildings and bridges
  • Reinstate damaged concrete and protect reinforcement

Advantages

  • Prebagged giving greater confidence
  • Single pack requiring only the addition of water
  • Easy to apply on overhead surfaces
  • Easy to achieve smooth surface finish
  • Suitable for structural repairs
  • Low VOC
  • Can contribute to LEED certification

Packaging

18 kg bag

Colour

Concrete grey

Product Details

Product Information

Product Declaration

Characteristics For Repair Mortar (from PCCS-RM CI. 5.1 Table 1)

Test Method

Test

Description

Age at TestPCCS-RM
Specification (Class 25)

Unicell® 25

Typical

Performance

TM1Compressive Strength28 days20–4030 MPa
TM2Tensile Strength7 days≥ 1.52.7 MPa
TM3

Elastic

Modulus

28 days9–1510 GPa
TM4Bond Strength7 days≥ 1.52.2 MPa
TM5Coutinho Ring1–28 daysNilNo Cracking
TM6

Figg Air

Permeability

35 days≥ 150216 sec

*All of the above data complies with Product Conformity Certification Scheme.

Shelf Life

6 months from the date of production

Storage Conditions

Stored properly in undamaged and unopened original sealed packaging. Protect from direct sunlight, moisture and frost.
Technical Information

Compressive Strength

Age at Test

Unicell® 25

Typical Performance

Test Method
7 days25 MPaTM1
28 days30 MPaTM1

Tensile Strength in Flexure

Age at Test

Unicell® 25

Typical Performance

Test Method

7 days6.2 MPaBS 6319 : Part 3 : 1983
28 days7.0 MPaBS 6319 : Part 3 : 1983

Tensile Strength

Age at Test

Unicell® 25

Typical Performance

Test Method
7 days2.7 MPaTM2
28 days3.0 MPaTM2

Tensile Adhesion Strength

Age at Test

Unicell® 25

Typical Performance

Test Method
7 days2.2 MPaTM4
28 days3.0 MPaTM4

Application

Application Information

Flowability

Approx. 60 %

(BS 4551 : Part 1 : 1998 cl.9)
Consumption

Consumption

Approx. 66 bags/m3
Application steps

MIXING

Mix the whole bag of Unicell® 25 with 3.3–3.6 litres clean water to even consistency with the aid of a mechanical mixer.

APPLICATION

  • Apply the well mixed Unicell® 25 mortar to the prepared and primed substrate before the primer coat dries
  • Application thickness should be between 6–50 mm per layer
  • Intermediate layers should be primed before the next layer is applied
  • Finish the repair to the desired profile using steel trowel or wood float
  • Allow the repair area to cure properly and consult with Sika technical department for curing method in severe conditions
  • Minimum cover to reinforcement should be 10 mm

CLEANING OF TOOLS

Clean all tools and application equipment with clean water immediately after use.

 

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