What are the applications of the stiffness module


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Asphalt with a high modulus of stiffness.


Güsfeldt, Karl-Heinz
Item made from: bitumen
ISSN: 0006-3916
(Germany):
Volume 57, No. 4, 1995
174-177, fig., Tab., Lit.

Location in the building library of the Fraunhofer IRB: DEIRB IRB Z 132

Publication lists on the topic:
Asphalt, rigidity, aptitude test, production, installation, compaction, laboratory test, rigidity module, mix composition, test field, asphalt, rigidity, aptitude test, production, installation, compaction, laboratory test, rigidity modulus, mix composition,

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Polymer bitumen roofing membranes for green roofs contain mecoprop esters as protection against root penetration, which gradually diffuse to the surface, hydrolyze and finally be released as carboxylic acids. The so-called "Mecoprop-P" of the free carboxylic acid is the driving force. The release of root protection agents from roofing membranes was investigated in this research project by the Fraunhofer IBP. The temporal course of the concentration in the pore water at a depth of 1 m should be estimated. The modeling of the mecoprop concentration should be carried out using the given framework conditions and various relevant input parameters.


Esters of 2- (4-chloro-2-methylphenoxy) propionic acid ("Mecoprop", MCPP) are used in polymer bitumen waterproofing membranes, which are used, for example, to waterproof green roofs. Upon contact with water, the mecoprop esters are washed out of the bitumen sheet and mecoprop is released from the esters by hydrolysis. The radicidal effect of Mecoprop protects polymer bitumen sheeting with a green roof structure from root penetration. However, only the (R) - (Plus) enantiomer, "Mecoprop-P", which is predominantly present in modern formulations to protect against root penetration, is effective. With the rainwater running off, Mecoprop can be released into the environment. The entry of mecoprop from construction products into the environment should be taken into account by the building authorities. The release of mecoprop from bitumen roofing membranes has already been investigated in the research projects P 52-5-20.88-1497 / 15 and P 52-5-20.88.2-1999 / 16. Among other things, the laboratory test according to DIN CEN / TS 16637-2 ("Horizontal dynamic surface leach test") was used. In future, the results from the laboratory test according to DIN CEN / TS 16637-2 will serve as input data for a mathematical model for modeling the environmental impact of Mecoprop. In order to obtain a robust process, a detailed regulation for all working steps of the surface leaching test is indispensable, as this is the only way to ensure reproducibility and the best possible comparability of results between laboratories.


14 road construction bitumen (B 45, B 80, B 200) from 8 different countries of origin were examined. Methods according to DIN 1995 were used to characterize the binders. In addition, thermoanalytical (DTA) and infrared spectroscopic investigation methods were used. The bitumen samples were tested in an unaged and aged condition. A series of measurement data from the standard examinations served as correlation variables for the interpretation of the thermoanalytically obtained results. The DTA of the bitumen was carried out by defined heating and cooling of samples in the range from -100 degrees Celcius to +100 degrees Celcius. Characteristic and reproducible thermograms were obtained. From them, glass transition areas with the associated glass transition temperatures could be determined. (-y-)


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The following references are taken from the RSWB database®plus. The database quickly and accurately supports specialists from planning companies, industry and research, as well as teachers and students in academic training with the verification and procurement of specialist information on planning and construction.

To the RSWB database®plus

Radenberg, Martin; Nytus, Nina; Stephan, Dietmar; Schwettmann, Kim
Postcarbone Street. The endless recycling cycle of bitumen
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Wörner, Thomas; Westiner, Erhard; Neidinger, Sara
Assessment of the quality of fine aggregates for the asphalt application area
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Gottschalk, Herbert; Kneißl, Martin
Seals: execution errors or errors in the system? Compliant with standards, but not in accordance with the rules of technology(free)
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Radenberg, Martin; Staschkiewicz, Matthias
Rheological investigations to characterize the cold behavior of bitumen-containing binders with the shear relaxation test
Road + Autobahn, 2020

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