presentation on breaking conventions for low cost housing
TRANSCRIPT
GOOD MORNING IEI
The Purpose of Painting is:
BEAUTIFICATION – To impart aesthetic importance
PROTECTION – To prevent deterioration due to Water Ingress
BREAKING CONVENTIONS
FOR LOW COST HOUSING
RAIN WATER DAMAGE
Fungus Paint peel off
Carbonation
Efflorescence
Rebar corrosion ASR induced cracks
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
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
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
Limitations of Old Silane Technology:
Flammability
Toxic VOC solvents High Cost
PENETRATIVE
REACTIVE ORGANOSILANE
NANOTECHNOLOGY WATERPROOFINGINSPIRED BY NATURE’S NANOTECHNOLOGY
TEST KIT DEMONSTRATION (AV)
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
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
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
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
Silane treats microcracks completely
Microcracks Silane treated microcracks
Water Penetrates inside the cracks
Silane prevents water penetration inside the cracks
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
BRICKS CONCRETE
High penetration depth (0.5 to 1 mm) = Long service life
NGO PENETRATES INTO
THE SUBSTRATE
NGO treatment makes surfaces
Water Resistant
Soil – Yellow, Red and Black Cotton
Fly Ash
Cement Sheets
Concrete Structures
Sand
Stones/Aggregates
Exposed Bricks
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
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.
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
VERTICAL - Manual / Machine Spraying
VERTICAL WALL MOCK-UP (AV)
NGO – A FOOLPROOF
SOLUTION
• Aesthetic Health of the Structure
Concern
• Silane Treatment
Solution• 10 years
minimum
Reliability
LCC (Life Cycle Cost) Analysis
• COST OF PAINTING – ???
• EXPECTED LIFE – ???
• COST OF SILANE TREATMENT – ???
• EXPECTED LIFE – ???
NGO – A RESPONSIBLE
SOLUTION
• Ageing due to Water Ingress
Concern
• 360⁰ / 180⁰ Zycosil Treatment
Solution• Permanent
Reliability
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