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deflectograph light impact (LWD): New incorporation into CITEVI
The new equipment strengthens the sion in pavement evaluation and esplanades.
Last March was imported from Germany, a deflectograph Light Impact (LWD, its acronym in English) ZFG 3000 Zorn Instruments. The computer determines the dynamic deflection module (Evd in MN / m2) and pavement subgrade for determining the bearing capacity and compaction of the materials used quickly, economically and easily.
The LWD, can be used as alternative to the assay plate static charge as indicated by the literature and the German regulations with advantages:
· Does not require a loaded for conducting the test truck, saving on costs and expanding applications testing.
· Can be used in confined spaces due to the size and lightness of equipment.
· High yields because each measuring point takes about 3 minutes on average.
· Provides accurate tests and recording automatically the measurements with time stamp and GPS coordinates.
Equipment joined with two 10 kg weights for one allowing pulse strength 7.07 kN and another 15 kg giving a pulse of 10.6 kN with load plate 300 mm.
Moreover an accessory brought to replace the load plate, to measure the in situ CBR materials. In the coming months we will be bringing you the results of different comparative studies are underway to determine the applicability of the equipment for determining these parameters.
Emulsions for high demands (65 IRRIGATION BITAFLEX P40)
Since 2011, SPECIAL BITAFAL ASFALTOS, It has expanded its line emulsions seeking to adapt to climatic conditions, use and traffic which are undergoing different technologies.
The specification used in our country for modified emulsions is the IRAM 6698 standard: Modified cationic asphalt emulsions. In it, to determine the degree of modification, the minimum requirement for elastic torsional recovery is 12%, a value that we consider extremely low since a conventional asphalt cement has about 8%. That is why we have specified two ranges of elasticity for all types of modified emulsions manufactured, one with a minimum of 25% and another with 40% elastic torsional recovery and three types of asphalt penetration ranges depending on the application and thermal gradient in the area to execute the work.
Then we attach an indicative table for selection of emulsions Irrigation
The emulsion designed for the highest demands was the emulsion BITAFLEX RIEGO 65 P40 D, Which is manufactured with an asphalt hard penetration of 50 to 80 dmm (and a viscosity above 2000 cP as determined in a study of sections required not presented exudates) and add a high amount of polymer achieve greater torsional elastic recovery 40%.
Already there are several sections that have used this emulsion on domestic routes (Route 26, Route 15, Route 8, Route 5, etc.) and their use is becoming more common because of the noticeable advantages of their use. On the one hand, it ensures good performance of works even when not run in optimal temperature conditions or performance and moreover withstand high traffic demands and climatic giving high durability to sections executed.
this emuslión was recently applied in the Chipping performed by Served en Route 8 with excellent performance, withstanding high temperatures and traffic, with minimal detachments.
For inquiries please write to bitafal@bitafal.com.uy or visit our website www.bitafal.com.uy
Ways of the world: Impressions of New Zealand trip
We had the pleasant opportunity to visit for 20 days, covering 2735 km of roads NEW ZEALAND and returned extremely surprised by the quality of roads in the country.
New Zealand has been successful in how to combine technologies way to get a paved road network of high quality. Let's start with comparative data with our country:
-New Zealand has 270,000 square km, 50% more than Uruguay.
-have 95,000 km of highways and roads (0.35 km / km2) of which 63,000 km are paved, 66% of the total.
-Uruguay 78,000 km road (0.44 km / km2) of which have 8000 pavings, only 10% of the total.
In other words, we have a higher density of roads per km2, but far we have long paved network as theirs.
It is that in New Zealand stabilization in situ with cement, lime or asphalt, is present decades, using as surface treatments surface layer and leaving only places high demands on the use of asphalt.
As we all know, the quality of the bases is essential, but if surface treatments are used as rolling. Conversing with them consulted engineers work, how they do it, and his answer was blunt: "It puts on a carpet and hard floor will last a lifetime, if you put on the clay have to throw very soon".
Transportation Agency's own New Zealand indicated on your website: "The surface treatment is the most common type of rolling road in New Zealand. Economic, flexible and resilient, it provides an adaptable, safe and cost efficient surface for road users. We have a regular all surfaces to ensure they will perform at maximum follow.High traffic roads resealed usually need about every seven years, while roads that carry less traffic can last 15 to 20 years before resurfacing is required. " (Source:NZ Transport Agency)
We share then as discussed with technicians work procedures used for construction of a typical road in New Zealand.
CONSTRUCTIVE PROCEDURE
The kickoff is performing test base materials, the effects deeply know what material is counted. The development laboratory formulates a stabilization project based on cement, lime or asphalt and if you have enough good granular material in the area is considered the particle size stabilization with a maximum size of 65mm and the addition of 2% of cement.
The bases are treated perfectly with suitable materials, with the necessary granulometry compacted and cleaned before waterproofing.
By having a very good base are limited to be as tread layer surface treatment with dry monogranular 6-12 mm and with the passage of time, when the treatment loses or shows a signal texture permeability, apply a second treatment with fraction 2-6 mm improving rolling and waterproofing structure again.
Then repeat the cycle with a large fine gravel 6/12 on and so on, always taking a road in perfect condition applying preventive maintenance at the optimum time.
Asphaltic used folders in the inner city, joints roads, highways exit of cities and in very short stretches of mountain roads when the slopes and angles are too demanding for a surface treatment.
The guide Transportation Agency New Zealand on the selection of the suitable tread layer is in the following link: Selection Guide surface layer
The use of surface treatments monogranular or Chiping, reaches places such as a neighborhood of the city of Auckland, and most important port in the country and the North Island as seen in the photos below city.
Our trip was not only on this visit in the month of May Bitafal group You will be participating in a two-day course on technologies Chiping in the city of Christchurch in the South Island. In addition we already have a publication of more than 500 pages of the Manual on Chipsealing in New Zealand. Interesting document available on: Chipsealing in New Zealand
To keep growing and researching, we have a long way to go.
We leave more photos in the following link
Advanced technologies: Chiping on Route 8
The company has relied on Serviam Bitafal Rentals to assist in the maintenance of Route 8 between Pirarajá and Aramendía through technology Chiping.
It involves the application of a simple surface treatment fog irrigation, using a highly modified with hard asphalts emulsion (Emulsion BITAFLEX IRRIGATION65 P40 D) And aggregates of excellent quality and grain size adjusted.
La condición inicial del pavimento consistía de una carpeta asfáltica fisurada pero casi sin ahuellamiento. La empresa realizó los bacheos necesarios y el sellado de fisuras y Bitafal Rentals colaboró con las modernas doble esparcidoras para lograr una buena terminación con elevados rendimientos de ejecución.
The result was a high surface macrotexture improving tire grip with the pavement and less effect "spray", combined with a total water proofing, ensuring a longer life to the pavement. Furthermore the application of a surface irrigation fog, beyond ensuring adherence of aggregates, manages to homogenize the surface to give a uniform aesthetic finish.
Combining a good job of preparing the surface, using materials of superior quality and performance with the latest equipment, we are sure it will work long service life.
Just relieve the sections of Chiping executed Ruta 5 por Necklace (San Gregorio north) in 2010, as we reported in previous editions of "Making Roads" to convince durability and excellent surface characteristics of technology.
ROADS :: :: MAKING
Bulletin No. 26 (23.11.2010)
Bulletin No. 54 (06.21.2013)
See all photos ON HERE
