chemically bonded asphalt for improved manufacturing and ...astm d 3625 salt water boil test asphalt...
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Chemically Bonded Asphalt For Improved Manufacturing and Construction of Asphalt Hot Mix
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a. Favorable Economics Cost negative at Capex with inbuilt insurance for future
b. Moisture Damage Chemically bonded asphalt binders to aggregates, eliminates de-bonding due to moisture
c. Cracking & Rutting Longer life durable pavements
d. Crew & Equipment Odor free, No fumes, Cooler hot mix & Cleaner equipment’s
e. Materials (aggregates / asphalt binder) Resolves aggregate & binder issues for high performance HMA / WMA
IMPACT
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a. Modified Binders Full Coating with PMB / CRMB at lower temperatures (15-200C)
b. Improved Mixing Reduced amperage in Pug Mill /Drum Plant
c. Binder Optimization Uniform coating and distribution of asphalt binder in fines below 75 microns. This usually results in 0.2-0.3% lower bitumen content for the same voids at design compaction load
d. RAP / RAS Thorough coating and improved workability/compaction eliminate construction limitations of high RAP/RAS content mixes
e. Jet Black Look
IMPACT
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THE CHEMICAL ACTION
Zycosoil Treated - Basalt Aggregate
ZycoTherm creates molecular level hydrophobic zone (water repellent)
-OH groups make surface very hydrophilic (water loving)
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Aggregate / Soil / Clay / Sand surface silicate structure
Particle surface
Particle surface
Aggregate / Soil / Clay / Sand surface silicate structure after ZycoTherm reaction
InternalSiloxane bonds
Silanol Groups
C 4 - 6 nm
Alkyl Siloxane surface
Untreated - Basalt Aggregate
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MANUFACTURING AID
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Only 0.05-0.15% Organosilanes is needed. This amounts to 5-8 gallons per asphalt tanker load
One tote of Organosilanes will make 20,000 to 30,000 tons of mix
LOW DOSAGE
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ZycoTherm modified asphalt binder coats RAP / RAS faster, enables better heat transfer to achieve quicker heating and melting of hardened asphalt
Improves ease of mixing of aggregates
Better mixing & melting helps virgin binder to mix homogenously with aged asphalt binder from RAP / RAS, to ensure binder mix uniformity
ZycoTherm mixes are greasier and compact easier even at higher RAP / RAS %, achieving 1 - 2% higher densities
HIGHER RAP / RAS
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ZycoTherm modified asphalt binder mixes exhibit remarkably low odor, making paving crew & residents very comfortable ZycoTherm has neutral pH and is non-flammable easy to handle liquid
ODOR FREE
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REDUCES EMISSIONS AND ASPHALT MASS LOSS
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Coking is observed on the coils in the bitumen tank due to intermittent heating cycles required to maintain bitumen tank temperature
ZycoTherm added in asphalt binder, eliminates buildup and also helps to clean up old buildup
Reduces fuel consumption & labor cost
CLEANER TANKS
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ZycoTherm modifies aggregate mix to achieve excellent release characteristic with metal surfaces such as drums, elevators and flights
This helps to maintain cleaner equipment carrying the hot mix to the silos
Cleaner elevators reduce spillage and eliminate need for cleaning thereby reducing labor cost
CLEANER ELEVATORS
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CONSTRUCTION AID
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a. Wets & spreads better
b. No uncoated particles (fines below 75 microns fully coated)
c. Provides blacker looking mix and retains color longer
100 % COATING UPTO 120 0C
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COLORADO, USA
FIELD APPLICATION
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FIELD APPLICATION
Madrid, Spain
WMA at 1300C Batch with RAP 25%
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IMPROVED MIX FLOW & CLEANER EQUIPMENT
ZycoTherm modified asphalt binder does not stick to the side or bottom of delivery trucks and to the paver machine, allows it to be maintained clean. This is particularly important for SMA or OGFC mix handling
Construction process is faster & easier due to improved mix flow with a consistent flow pattern
Reduces labor cost due to easier / less manual attention on paver machine
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Asphalt mixes have easier workability at lower temperatures due to substantially reduced stickiness to trucks, paver & compaction roller
Improved workability at mix temperature of 1250C helps workers to spread cooler hot / warm mix and still get compaction at 900C
EASIER WORKABILITY
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Consistent gradation and higher densities by 1.5 - 2% across lane width for same number of passes due to uniform flow and ease of compaction
IMPROVES FIELD COMPACTION UP TO 90 0C
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COMPACTION EFFICIENCY
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Chemical bonding eliminates aggregates moisture susceptibility aggregates by converting silanols to siloxane bonds
Wet / moist aggregates fed for WMA mixes is a serious concern for aggregate asphalt de-bonding, usually requiring anti-strip additives
Aggregates water/moisture with ZycoTherm acts as a catalyst and promotes reactivity of asphalt binder with aggregate to achieve chemical bonding
Retains 95% coating in 6 hours ASTM D3625 boil test
ELIMINATES STRIPPING
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Allows paving in sub-zero (- 50C) temperature
In early & late season, the day/night time and wind speed, affect the temperature of mix being delivered, causing variability in compaction density
ZycoTherm due to its excellent workability and free flow characteristics, allows compaction in a larger range of temperatures to achieve consistent similar densities
COLD WEATHER PAVING
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Doubles or more the operational distance
Increases commercial paving opportunity for HMA plant by 3-4 times in a given location
LONGER HAULS
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PERFORMANCE AID
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BOIL TEST ASTM D3625
Basalt Aggregate (DBM) : 45% 20 mm, 10% 10 mm, 45% less than 6 mm with stone dust Asphalt Grade: AC-20 (VG-30, 60-70 penetration grade)* Specified Standards Less than 75% considered as failure
0
25
50
75
100
Control 2% Hydrated Lime 0.5% Amine 0.1% Zycosoil10 min 30 min 1 hr 6 hrs
% C
oated
Agg
rega
tes
RETAINS ABOVE 90 % COATING IN 6 HOUR BOIL TEST
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MAKES HIGHLY RESISTANT TO SALT ACTION
ASTM D 3625 SALT WATER BOIL TESTAsphalt Grade
ZycoTherm %by wt. of Asphalt
Binder
Mixing & 2 hour conditioning
temperature °C
% Coated aggregates% Coated aggregates% Coated aggregatesAsphalt Grade
ZycoTherm %by wt. of Asphalt
Binder
Mixing & 2 hour conditioning
temperature °C 10 min 1 hr 6 hr
PG 64-22 / VG 30 /
60-70 Pen.
Control 135 59 10 5PG 64-22 / VG 30 /
60-70 Pen. 1% Hydrated lime
135 65 25 10PG 64-22 /
VG 30 / 60-70 Pen.
0.5% Amine 135 60 15 5
PG 64-22 / VG 30 /
60-70 Pen.
Control 120 15 5 2
PG 64-22 / VG 30 /
60-70 Pen.
0.1% ZycoTherm 120 95 95 85
PG 76-22 / PMB (SBS)
PMB control 165 98 65 10PG 76-22 / PMB (SBS) 0.1% ZycoTherm 135 98 98 98
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APA RUT TEST RESULTS
HMA/WMA with Granite Aggregate at 64 oC, wheel load 100 lbs and 8000 cycles
3.263.943.524.14
Zydex WMA & HMA’s both have good rutting resistance (5mm rut cut off by DOT’s) even though rut depth of Zydex WMA is marginally higher than HMA
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ORGANOSILANE ADDITION IN ASPHALT BINDER
Co-inject while loading the tanker or dump in the tanker before loading
Co-inject while unloading tanker at the HMA plant
Add in the tanker before transfer to storage tank at the HMA Plant, but ensure recirculation of the asphalt binder to achieve uniformity
ZycoTherm is soluble & stable for 15 or more days in hot asphalt binder
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BENEFITS SUMMARY
a. Very low dosage- cost effective
b. Improved coating, workability, and compaction
c. Low odor
d. Keeps metal surfaces cleaner in the plant and field
e. Permanent chemical bonding of asphalt to the aggregate provides superior long term water and salt resistance
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Thanks You
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