Presentation on Breaking conventions for low cost housing
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Transcript of Presentation on Breaking conventions for low cost housing
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GOOD MORNING IEI
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The Purpose of Painting is:
BEAUTIFICATION – To impart aesthetic importance
PROTECTION – To prevent deterioration due to Water Ingress
BREAKING CONVENTIONS
FOR LOW COST HOUSING
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RAIN WATER DAMAGE
Fungus Paint peel off
Carbonation
Efflorescence
Rebar corrosion ASR induced cracks
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How/Why Concrete Ages/Cracks?
Pre-construction Factors Post-construction Factors
o ENGINEERINGo RAW MATERIALSo WORKMANSHIP
PHYSICAL CHANGES(Expansion / Contraction)
Shrinkage(Concrete Setting)
Thermal Fluctuations
CHEMICAL CHANGES
ASR Carbonation Acid Attack Freeze-Thaw Rebar
Corrosion
Results in loss of aesthetic value of the structure due to cracks,fungal growth, efflorescence, paint peel off & dirt sticking
NaturalCalamities Earthquake Flood Hurricane Fire
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Water: How it seeps into structural pores?
Substrate pore size5 - 2000 nm
Rain Water seeps into the building through micro cracks & pores
Water Molecule = 0.18 nmWater Drop = 100,000 nmSalt/ Acid rain ~ 100-200 K nm
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WATERPROOFING PRODUCTS
Covering Type
Penetrating (Reactive) Type
o Elastomerico Acrylico Distempero Cement
CRYSTALLINE Penetrating Reactive Semi-Breathable Toxic Byproduct – Alkali Risky on load
bearing elements Negative side
waterproofing Water activated Skilled labour Non-UV resistant Effective on New
Concrete
In addition to these, several technologies are used for “Defect Rectification ”, like, grouts, sealers, gap fillers, resurfacing concrete, etc., during the execution of a waterproofing job
Paints(Thin film)
Membranes(Thick film)
o Polymerico Bituminouso PUo Epoxy
Liquid Sheeto APPo EPDMo HDPEo TPOo Tar Felt
SILANE Penetrating Reactive Breathable Non-toxic Byproduct – Water Safe on load
bearing elements Only Positive side
waterproofing Solvent Based Unskilled labour UV resistant Effective on ALL Low VOC
INTEGRAL TYPE
Admixtures
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Limitations of Old Silane Technology:
Flammability
Toxic VOC solvents High Cost
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PENETRATIVE
REACTIVE ORGANOSILANE
NANOTECHNOLOGY WATERPROOFINGINSPIRED BY NATURE’S NANOTECHNOLOGY
TEST KIT DEMONSTRATION (AV)
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Reactivity of New GenerationOrganofunctional (NGO) Silanes
R = “Organofunctional” group
X = “Silicon-functional” group
X
SiR
X
X
Organoalkoxysilanes exhibit
a chemically bifunctional structure
Microphotograph of
Lotus Leaf
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Uniqueness of NGO Does not leach out or wash out with persistent rains Over 20+ years UV stability (tested as per ASTM G154)
O
Si
Si O
ZycosilZycosil
O
Si
Si O
O
Si
Si O
O
Si
Si O
O
Si
Si
Organofunctional Long Chain Molecule Group
Nature’s Strongest Bond
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THE CHEMICAL ACTION
Aggregate / Soil / Clay / Sand surface silicate structure after Zycosil reaction
O
S iO
S i
O
S i
O
S i
O
S i
O
S i
O
S i
O
O
S i
O
OO
O
S i
O
O
O
S i
O
O
O
S i
O
OO
O O
O
O
S i
O
O
O
S i
O
O
O
S i
O
O
S i S i S i S i S i S iS i
O
OO
OO O O O
O
O O
O O
O
S i
O
S i
O
S i
O
S i
O
S i
O
S i
O
S i
O
O
S i
O
O HO H
O
S i
O
O
S i
O
O H
O
S i
O
OO
O O
O
O
S i
O
O H
O
S i
O
O H
O
S i
O
O HO H
Particle surface
OH groups make surface very hydrophilic (water loving)
Particle surface
Internal
Siloxane bonds
Aggregate / Soil / Clay / Sand surface silicate structure
Silanol
Groups
Zycosil creates
molecular level
hydrophobic zone
(water repellent)
4 - 6 nmAlkyl
Siloxane
surface
Does not leach out or wash out with persistent rains Over 20+ years UV stability (tested as per ASTM G154)
Nature’s Strongest Bond
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Particle sizes for different types of water repellents
Typical
Concrete
Concrete Pore
OtherPenetrants Blended
Coatings
SiliconeResins
AcrylicResins
EpoxyResins
Silane Molecule
Nanometer0 5 50 100 500 700 1000
Advantage of 100% Silane Nanotechnology
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Silane treats microcracks completely
Microcracks Silane treated microcracks
Water Penetrates inside the cracks
Silane prevents water penetration inside the cracks
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Pore size
5 - 2000 nm
NGO WATER DROPLET
Changes surface properties of the substrate
Speciality of NGO
Concrete Pores 10--200 nm
Stone Pores 5-200 nm Brick Pores 100-2000 nm
Plaster Pores 50-3000 nm
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BRICKS CONCRETE
High penetration depth (0.5 to 1 mm) = Long service life
NGO PENETRATES INTO
THE SUBSTRATE
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NGO treatment makes surfaces
Water Resistant
Soil – Yellow, Red and Black Cotton
Fly Ash
Cement Sheets
Concrete Structures
Sand
Stones/Aggregates
Exposed Bricks
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ACCELERATED WEATHERING TEST
ACCELERATED WEATHERING
WEATHERING CYCLE
UV exposure according to
ASTM G-154 (21 hours), followed by rain
showers (1 hour) and drying at 110⁰C (2 hours).
The samples, Concrete blocks, Bricks, Plaster,
Sand stone, and Cement Sheet
have undergone over 90 cycles.
All the Samples retained over 98% of water
repellency, after 90 cycles
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TESTS DESCRIPTION SPECIFICATIONS
ASTM 1195 Absorption of architectural cast stone Min. 85% protection
ASTM 1403 Rate of water absorption of masonry mortar Min. 85% reduction
ASTM E 514 Water penetration and leakage through masonry
Min. 90% reduction
ASTM C67 Sampling testing of brick & structural clay tile Min. 85% reduction
ASTM C 1653 Vapour transmission through clear organicfilm
98% efficient
ASTM G 154 Accelerated weathering standard practice for operating enclosed carbon arc apparatus
for exposure on non-metallic material
Min. 95% effective after exposure
> 5% reduction in efficiency
RILEM TEST METHOD 11.4
Rate of water movement through porous material, like, masonry
Max. 0.2ml drop in 20 min.
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NGO FORMULATION
Conventional solvent based Silanes & Silane/Siloxane mixture
contains flammable volatile organic solvents which are released into
the environment.
NGO is applied in substantially diluted form (20 times water),
releasing significantly less amount of Volatile Organics.
2 gm vs 10 gm / ft.2 coverage
NGO meets the toughest VOC standards
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VERTICAL - Manual / Machine Spraying
VERTICAL WALL MOCK-UP (AV)
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NGO – A FOOLPROOF
SOLUTION
• Aesthetic Health of the Structure
Concern
• Silane Treatment
Solution• 10 years
minimum
Reliability
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LCC (Life Cycle Cost) Analysis
• COST OF PAINTING – ???
• EXPECTED LIFE – ???
• COST OF SILANE TREATMENT – ???
• EXPECTED LIFE – ???
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NGO – A RESPONSIBLE
SOLUTION
• Ageing due to Water Ingress
Concern
• 360⁰ / 180⁰ Zycosil Treatment
Solution• Permanent
Reliability
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THANK YOU.
For further clarifications or assistance, feel free to write or call:
Anupam ShilDGM - Technical Services
ZYDEX INDUSTRIES
Cell: +91 84695 22233
Direct: +91 265 331 2301
E-mail: [email protected]
360⁰ Protection