Ascobond 450

INTRODUCTION

ASCOBOND 450 is a Styrene-Butadiene Rubber Latex based material, designed to improve the waterproofing, bonding, physical properties and integrity of cementitious mortars, screeds and concretes. ASCOBOND 450 also acts as a bonding agent/ sealer to concrete, plaster or other porous substrates. ASCOBOND 450 improves durability, compressive, tensile and exural properties of modified mixes. In addition, screeds and renders can be waterproofed, greatly improving their resistance to abrasion, frost, water vapour transmission and chemical attack. It is suitable for horizontal or vertical applications, both internally and externally. In certain applications, ASCOBOND 450 provides a simple, easy to use and cost-saving alternative to epoxy and polyester resin based systems.

 

RECOMMENDED APPLICATIONS

For bonding
WATERPROOFING internally Basements, Swimming pools, potable water tanks,
WATERPROOFING Externally
WATERPROOFING suspended floors
waterproof protective slurries: mild chemical holding tanks, porous concrete & block work
Improves the Durability
Repair of concrete
 

FEATURES & BENEFITS

Easy to use.
Highly versatile and can be used for a variety of applications.
Enhances the flexural and tensile strength of mortars and renders.
Greatly improves adhesion to substrate.
Waterproofs cementitious systems.
Reduces shrinkage cracking.
 

TECHNICAL PROPERTIES

Form Modified Viscous Liquid
Color Milky White
pH 8 - 9
Specific Gravity 1.01±0.02
Solids 45 - 47 %

COVERAGE

  • As a neat bonding agent: 5 - 7 m² per litre per coat.
  • As a waterproofing slurry: 2 – 2.5 m² in two coats.
  • As an additive to tile adhesives, bedding mortars, sand renders, plasters and screeds, the dosage may vary from 10 – 20 % by weight of cement.
  • All coverage rates given are theoretical and subject to actual site conditions. We recommend trial areas are done to establish practical consumption, particularly for primers.

PACKAGING

Available in 1, 5, 20, 50 & 200 L packing in jerrycan & bucket with a sealed cap.

SHELF LIFE

12 months from production date, if stored in original, unopened packaging in places protected from moisture, sun exposure and frost.

 
 

APPLICATION PROCEDURE

SURFACE PREPARATION

All surfaces must be clean and structurally sound. Oil and grease must be removed. For best results, the surface of the concrete should be mechanically scaried, although other methods including sandblasting may be employed.

PRIMING

Use a mix consisting of 2 parts OPC mixed with 1 part ASCOBOND 450 gauging liquid (2 parts ASCOBOND 450 with 1 part water) by volume. Mix into a smooth paste. This primer is then brushed onto the prepared surface using a stiff brush, after ensuring there is no free-standing water. It is essential that the topping is applied whilst the priming coat is still tacky. If it is allowed to dry out then the primer must be removed and surface should be re-primed using the same procedure.
Coverage for Priming Coat: 2.5 – 3.5 m² per litre.

INTERNAL & EXTERNAL WATERPROOF RENDERS

Surface preparation should be done as previously described.Surface preparation should be done as previously described. Two priming coats should be applied perpendicular to one another. The second coat should be applied immediately after the rst coat has dried, approximately after 30 minutes. A thickness of each sealing coat should not exceed 1.5 mm or crazing may occur.

Allow the two priming coats to dry out completely for a minimum of 48 hours after which the surface is again primed and then the general purpose mortar should be applied while the primer is still tacky. Minimum thickness should be 12-15 mm.

CURING

Curing is essential for all cementitious products to prevent possible shrinkage cracks and ensure that the performance characteristics of the product are achieved.

GENERAL PURPOSE MORTAR/ SCREED

For the majority of applications, the following can be used as a mortar, render or screed after the surface has been primed, as previously described.
Thickness depends upon application but 12-15 mm is normally applied. On vertical surfaces, this is built up in two coats. Normal time between applications is 6 hours but this depends on the temperature. Where more than one coat is applied, ensure that the intermediate coats are hatched to provide a mechanical key. If the surface dries out completely then the surface should be reprimed.

* Kindly follow the required health and safety precautionary measures. (Refer our Safety Data Sheet for more details)

 

MIX DESIGN

Dry blend the sand, cement and aggregates together in the mixer in accordance with the mix design guidelines below:

APPLICATION OPC (Kg) SAND (Kg)
ZONE 2
AGG (Kg)
4-6 mm
ASCOBOND
45 (L)
POTABLE
WATER (L)
YIELD (L)
(APPROX.)
BONDING SLURRY 50 00 00 10 14 40
WATERPROOFING SLURRY 50 00 00 20 5 41
REPAIR MORTAR
5-40 MM THICK
50 125 00 9 7 79
RENDER 5 – 12 MM THICK 50 150 00 9 6 87
HEAVY DUTY FLOOR
SCREED 10 – 20 MM THICK
50 87 87 10 6 110

 
 

BROCHURE