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Tag: AS4001S sealant

Importance of concrete expansion joints and joint sealant

What are concrete expansion joints and why are they important?  What is a concrete expansion joint? A concrete expansion joint – or control joint – is a gap which allows the concrete to expand and contract as/when the temperature changes. It forms a break between the concrete and other parts of a structure to allow movement without causing stress, which can lead to cracking. They should be used in large concrete slabs such as foundations and concrete driveways. The expansion joint shall be covered by sealant to prevent dust accumulation, water and secure a smooth drive on the surface. Normally there 2 kinds of sealant used for expansion joint namely polyurethane (PU) and modified silicone (MS sealant) sealant. PU sealant is often harder to apply, may cause bubbles (as it contains isocyanate), shrinkage (as it contains solven –  a kind of gas which evaporates during curing) and less UV resistant than MS sealant. MS Construction Sealant is a one-part, high-performance hybrid sealant that is based on advanced MS Polymer technology. It has excellent weathering, UV and temperature resistance characteristics, and with outstanding features:
  • Good Environmental Choice Australia (GECA) certified
  • ASTM C920 (Class 50) compliant
  • ISO 11600 (F Class 25 LM) compliant
  • Good UV resistance
  • Low static charge – Less dirt streaking
  • No silicone oil – Non-staining on adjacent substrates
  • No isocyanate – No air bubbling
  • No solvent – No shrinkage
  • Bonds most substrates without primer
See more here Why do you need concrete expansion joints? All concrete will shrink slightly as it dries and, when it’s set, will expand or contract depending on the ambient temperature. To prevent crack formation, concrete expansion joints should be incorporated to allow for movement, particularly in slabs with a surface area exceeding 6m2. Concrete expansion joints are particularly important where there have been consecutive concrete pours and are also useful when laying concrete within an area bordered by walls or buildings or if objects such as manhole covers need to be incorporated. If several construction joints are needed, it would be advisable for them to be designed and specified by a structural engineer.  Installing concrete expansion joints You can install concrete expansion joints before or after the concrete is laid. In the first instance, a flexible material is inserted along the length of the joint before the concrete is poured. Alternatively, once the concrete has set, grooves can be cut in the concrete, this will control where the concrete will crack leaving a neat saw cut at the surface and allow joint materials to be added where required, but care must be taken to ensure the correct depth is achieved (see below). Tips for placing concrete expansion joints
  1. Place joints around 30 times the slab thickness apart. So, for a slab which is 100mm thick, the joints should be placed around 3,000mm (3 metres) apart.
  2. Make sure joints are cut deep enough: they need to be at least a quarter of the thickness of the slab. For a 100mm slab, cut the joints at least 25mm deep. 
  3. If you’re cutting joints after the concrete has been poured, don’t leave it too long. Concrete might crack if the joints aren’t cut within 12 hours after finishing.
  4. Placing joints under walls will mean they won’t be seen.
  5. Joints are most effective when the aspect ratio of the slab is kept to 1:1, for example 5m x 5m if the slab is a narrower than it is long it is possible to increase this to a maximum aspect ratio of 1.5 for example 2m x 3m, don’t leave the placing of concrete expansion joints to chance and enlist the services of a structural engineer if several are required. 
  6. For a neat sealant edge, it is recommended to use masking tape.
  7. To better control sealant depth and avoid 3-side bonding, use backer rod.
Below is how expansion joint sealing is applied.
keo tram khe co gian MS slealant 8
masking before sealant application
keo tram khe co gian MS slealant 7
Door peremeter sealing
keo tram khe co gian MS slealant 9
Concrete expansion joint sealing
keo tram khe co gian MS slealant 6
Concrete expansion joint sealing
keo tram khe co gian MS slealant 1
Concrete expansion joint sealing
keo tram khe co gian MS slealant 11
Door peremeter sealing

MS sealant for green building

GECA green MS sealant
Construction Sealant is a one-part, high-performance hybrid sealant that is based on advanced MS Polymer technology. It has excellent weathering, UV, and temperature resistance characteristics. Ideal for sealing building concrete joints like wall panel joints, expansion joints, control joints, etc. It is also recommended for sealing window frame perimeter, metal panels and natural stone façade etc. Other common applications include sealing of anodized aluminium, finished wood, porcelain, coated metal, epoxy and polyester panels, polystyrene, UPVC, and stainless steel, is a base resin for producing quality sealants and adhesives for construction and industry. Its unique properties enable MS Sealant (the sealant based on Kaneka MS Polymers) to deliver outstanding performance, widely recognized by applicators and architects throughout the world. The inherent properties of MS Sealant can be summarized as in the next slides.

EASY HANDLING/WORKABILITY

MS Sealant is easy to use: it can be extruded from cartridges with a low force even at low temperature. A continuous flow of sealant with stable viscosity is the norm. Furthermore, smoothing and tooling of the joint are easier with MS Sealant than with any other kind of sealant
EXCELLENT ADHESION

EXCELLENT ADHESION

MS Sealants exhibit good primerless adhesion to a wide range of substrates that are commonly used in construction and industry, such as PVC, Aluminum, Glass, Steel, Ceramic, Plywood and many of the newly developed materials for construction.
WEATHER RESISTANT

WEATHER RESISTANT

The resistance to natural weathering such as rain and UV is one of the advantages of MS Sealant that allows use of the sealant outdoors ? even in adverse weather. MS Sealant shows no cracks after UV exposure. The elasticity of the sealant is maintained over time, even years after application.

HIGH-QUALITY MECHANICAL PROPERTIES

MS Sealant has excellent mechanical properties including both: stable elasticity over a wide temperature range (-40C to 100C) and long-term stability. MS technology enables formulators to customize from a very low modulus sealant with 100% modulus at 60psi, to a very high strength adhesive with lap shear strength of 1,500psi.
NON-BUBBLING

NON-BUBBLING

MS Sealant does not bubble on the surface at all. The surface of the sealant is kept smooth and intact. A constant and uninterrupted joint is easily achieved.
NON-STAINING

NON-STAINING

Excellent non-staining characteristics can be obtained with MS Sealant. Porous substrates used in construction, such as granite and marble, can be sealed with a wide range of MS Sealants with low risk of contaminating the stone surface.
PAINT COMPATIBILITY

PAINT COMPATIBILITY

Compatibility with many kinds of paint is appreciated by many users in industry and construction. MS Sealant is compatible with many types of paints and coatings. MS Sealant can immediately be painted over after application. The paint cures relatively quickly after a reasonable time.
UNIVERSAL

UNIVERSAL

MS Sealant can be used for a wide variety of applications. A single product can be used for waterproofing, bonding, sealing… and will adhere to different substrates at the same time. There is no need to buy a seperate sealant for each application.
GREEN SEALANT

GREEN SEALANT

Certificed by Good Environmental Choice Australia (GECA), no hazardous materials such as isocyanate, solvent, heavy metals etc.

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