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HIAN HSIN TRADING. was established on
Glass Fibre Reinforced Concrete (GRC) sometimes called Glass Fibre Reinforced Cement. It is a mixture of cement, fine aggregate, water, chemical admixtures and alkali glass fibres.
Glass Fibre Reinforced Concrete (GRC) is a material which today is making a significant contribution to the economics, to the technology and to the aesthetics of the construction industry worldwide.
ROLE OF FIBRES
When the loads imposed on concrete approach that for failure, cracks will propagate sometimes rapidly, fibres in concrete provide a means of assisting the growth. Reinforced concrete bars in concrete have the same beneficial effect because they at as long continuous fibres. Short discontinuous Glass Fibre has the advantage, however, being uniformly mixed and dispersed throughout the concrete.
PROPERTIES OF GRC
Characteristics of Glass Fibre Reinforced Concrete (GRC)
GRC possesses greatly improved properties over those associated with conventional mortars and concrete. GRC product has widely used in construction and civil engineering.
GRC provides the architect with an end product range that no other material can match in terms of shape, form, texture, lightweight, mould ability and long term technical properties. This diversity of properties offers the architect a material which has:
a) Lightweight due to thin section, ease and speed of handling, with reduced erection and transportation coats.
b) Low maintenance requirements.
c) Low permeability i.e. good waterproof property.
d) Excellent fire resistance property.
e) Environmental acceptability i.e. excellent anti corrosive property.
f) Ability to produce fine surface.
g) Reduce loading on building leading to substantial reductions in structural and foundation cost, especially useful for building renovation or restoration.
h) Design flexibility.
I) High bending strength and impact strength.
j) High toughness and cracking sensivity.
The Glass Fibre Reinforced Concrete (GRC) shall contain the following property after 28 days curing
| Comprehensive Strength (N/mm | 50 |
| Density (kg/m | 1,500 |
| Ultimate Strength (MOR) (N/mm | 18 to 30 |
| Elastic Limit (LOP) (N/mm | 7 to 11 |
VARIOUS APPLICATIONS
Glass Fibre Reinforced Concrete (GRC) has been widely used in construction and civil engineering. GRC is applicable to a wide range of work discipline, such as architect, civil engineering and agriculture.
GRC has been custom made to suit specific design of building; it has been successfully installed as:
Column covers
Large scale arches
Fascia panels
Company logos
Sculptured elements for interior decors
Sophisticated exterior claddings
METHOD OF INSTALLATION FOR GRC PILLAR
Our GRC products for this project are very easy to install. We try to make it simple, so we are purpose using ceiling plasterboard fixing method for the corridor ceiling. First prepare the galvanized metal suspension system as stated below.
GALVANISED METAL SUSPENSION SYSTEM
Suspension System shall consist of 38mm x 25mm galvanised steel Main Tee runner spaced at 1220mm centre to centre in on direction and 450mm centre to centre the other direction. Galvanised steel is to be suspended and bracket powder-fixed to the structure soffit.
We purpose 2 types of GRC products to cover the ceiling.
- GRC panel �C overall size 1220mm X 800mm X 8mm thick
-GRC L-shape angel - overall size 250mm (height) X 300mm (width) X 1159mm (length) with 8mm thick
Installation
Fix the GRC panel on to galvanized metal suspension. It can be temporary fixed in position with joint to be grouted at the back and over metal with fibreglass. After grouting has set, remove all temporary fixing and flush up joint with "plastering" compound. Before install the L-shape GRC angel, determine the hanging points according to the height which confirm by Architect. Allow 20mm to 35mm for each corner to compensate for cutting to maintain and level of the height. Any gap or joint can be filled with the same adhesive compound and fiberglass. Any extra adhesive on the surface/edges should be removed immediately. When installing GRC L shape angel/panel, treat them just as it they were wood, Pieces can be cut drilled, nailed and screwed just like wood. If you like install using screw instead adhesive compound, we recommend the use of trim head dry wall screws as fasteners, They are self-countersinking and leave a hole that is easy to fill. Ensue all the patching and skimming touch up works to joints is done in correctly. Make sure all the alignment and straightness, verticality and horizontal and follow the guide specification agreed for the project.
Cutting Tools
Cornices can be cut using a conventional handsaw with suitable miter block or electrical cutter.
Adhesive/Plastering Compound
Put clean water in a container (approx: 300mmX300mmX40mm).
Add adhesive cement/powder evenly until it covers the surface of water.
Mix part of mixture in container thoroughly to form a paste. (Setting time ~15 minutes),
Ratio of mixture: ~750ml water : 1 kg adhesive cement/powder.
Easy And Clean Installation
Simple tools are required for installation It saves time and is easy to maneuver.
TECHNICAL INFORMATION OF PRECAST LIGHTWEIGHT CONCRETE COPING, GABLE END AND MOTIF
We are pleased to submit herewith our technical information of the proposed precast lightweight as mentioned above.
1) Products - Precast lightweight concrete
2) Surface - Smooth and bare finish (cement color)
3) Density - 800-1000kg per cubic meter (depend to the design)
4) Strength - Below 5 MPA. It is not advice to use as a support of any other structure although it can support its own dead weight. (For decorative purposes only)
5) Installation - Please follow the attached method of installation statement. Check and make sure masonry anchor or concrete nail must be applied to all the brackets fixing system and adhesive cement must be applied in sufficient quantity to fill up both sides of joints and adhered faces.
6) Joint finishes - Ensue all the patching and skimming touch up works to joints is done in correctly. Make sure all the alignment and straightness, verticality and horizontal and follow the guide specification agreed for the project.
METHOD OF INSTALLATION FOR LIGHTWEIGHT CONCRETE PRODUCTS
For Small Coping & Cornice
Small coping or cornices and window surround with the overall sectional size smaller than 200mmX 200mm is usually cast in solid profile with the density range from 1200kg/m3 to 800kg/m3 , and comprising with 18mm X 2mm thick steel band brackets precast in it at 600mm center to center. The installation of this small cornice is simple. Please follow the instruction below:
1.0 MARK THE LEVEL AND POSITION OF CORNICE
Obtain the level and position of cornices from the architect drawing and mark the lower horizontal line or vertical line of cornice on the existing pre-plastered wall. It is advisable to check all the level, before determine the most suitable level of installation.
2.0 TEMPORARY SUPPORT
Drill some ∅6mm x 75mm depth hole onto the existing wall below the level mark at about 1.2m in spacing and slot in the hole with ∅6mm x175mm mild steel rod pre-cut to size for the temporary support of cornice.
3.0 ALIGHMENT OF THE CORNICES AWAY FROM WALL
Check the alignment of the existing pre-plastered wall by using nylon string. Tied a nylon string to a steel rod or timber pre-nailed to both ends of wall to check the alignment and get the straight line of cornice by offset the nylon string away from the wall.
4.0 FIXING CORNICETO THE EXISTING WALL
Cut the cornice to the required length with handhold electrical diamond cutter (∅300mm). Apply both wall and cornice with adhesive cement and place the cornice onto the temporary supporting rods. Adjust the cornice accordingly by guide of the alignment nylon string. Mark the position of bracket and hacked the existing plastered wall to receive and concealed the steel band brackets. To secured the precast cornice with ∅6mm x 50mm long masonry anchor. Check alignment of items for straightness, verticality and horizontality.
4.1 ADHESIVE CEMENT
Use only good premixed adhesive cement for the installation of cornices, as the expansion agent will help reduce shrinkage cracks and fill voids. Mixing procedures of adhesive cement from the manufacturer shall follow accordingly. Always check the adhesive cement and must applied in sufficient quantity to fulfill both sides of joints and adhered faces.
4.2 SAMPLE DATA OF PREMIXED ADHESIVE CEMENT
Sample data of premixed adhesive cement:
|
|
Dry Condition
(KN) |
Wet Condition
(KN) |
|
Tensile Adhesion |
|
|
|
Typical value |
1.77 |
1.23 |
|
BS 5980 Min |
0.95 |
0.56 |
|
|
|
|
|
Shear Adhesion |
|
|
|
Typical value |
20.0 |
17.9 |
|
BS 5980 Min |
8.90 |
4.50 |
5.0 PATCH UP AND TOUCH UP WORK
All the joints between cornices to cornice, cornice to wall. Hacking to the wall for brackets, patched up and skimming by using concentrates adhesive like 'MULTIPUR Bond Powder' mixed with cement and water. Its excellent workability and bonding strengths is very much suitable for the patch up work.
5.1 SAMPLE DATA OF CONCENTRATES ADHESIVE
Sample data of concentrates adhesive:
|
Pot lift |
Approx.
4 hours |
|
Coverage with
6mm notch trowel |
Approx. 10-12m2
/ 25kg cement |
|
Fungi resistance |
Excellent |
|
Bonding Strength
(DIN 18156) |
|
|
Testing |
1.3 N/mm2 |
|
Required |
>0.5 N/mm2 |
|
Open time as
evaluated by bonding strength by European Standard (prEN
1346) |
|
|
Testing bedding
after 5 minutes |
1.3 N/mm2 |
|
10 minutes |
0.7 N/mm2 |
|
20 minutes |
0.5 N/mm2 |
|
30 minutes |
0.2 N/mm2 |
|
Required
20 minutes |
> 0.5 N/mm2 |
|
|
|
5.2 MIXES OF CONCENTRATES ADHESIVE
|
USES |
CEMENT (KG) |
WATER ( LITER) |
FINE SAND (KG) |
ADHESIVE POWDER
(g) |
|
ADHESIVE |
25 |
10 |
25 |
100 |
|
PATCHING |
25 |
10 |
0 |
100 |
|
* PAINT COAT FOR
TOUCH UP |
25 |
30 |
0 |
30 |
This coating will 'stick' better than neat cement and not develop hairline cracks.
The above house project is using the precast lightweight concrete for window hood and sill .