Chemically Bonded Asphalt For Improved Manufacturing and ...ASTM D 3625 SALT WATER BOIL TEST Asphalt...

transcript

Chemically Bonded Asphalt For Improved Manufacturing and Construction of Asphalt Hot Mix

Tuesday, February 4, 14

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

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

THE CHEMICAL ACTION

Zycosoil Treated - Basalt Aggregate

ZycoTherm creates molecular level hydrophobic zone (water repellent)

-OH groups make surface very hydrophilic (water loving)

O OO O

Si Si Si Si Si SiSiO

OO O O OO

O OO O

Aggregate / Soil / Clay / Sand surface silicate structure

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

MANUFACTURING AID

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

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

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

REDUCES EMISSIONS AND ASPHALT MASS LOSS

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

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

CONSTRUCTION AID

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

COLORADO, USA

FIELD APPLICATION

Madrid, Spain

WMA at 1300C Batch with RAP 25%

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

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

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

COMPACTION EFFICIENCY

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

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

Doubles or more the operational distance

Increases commercial paving opportunity for HMA plant by 3-4 times in a given location

LONGER HAULS

PERFORMANCE AID

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

Control 2% Hydrated Lime 0.5% Amine 0.1% Zycosoil10 min 30 min 1 hr 6 hrs

RETAINS ABOVE 90 % COATING IN 6 HOUR BOIL TEST

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

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

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

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

Thanks You

Chemically Bonded Asphalt For Improved Manufacturing and ...ASTM D 3625 SALT WATER BOIL TEST Asphalt...

Documents