Potentiometric-titration-based method for detecting doping amount of modifying agent in modified asphalt
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A technology of modified asphalt and detection method, applied in the direction of electrochemical variables of materials, etc., can solve the problems of low detection accuracy, high detection cost, precipitation, etc.
Inactive Publication Date: 2013-10-23
HUNAN ZHILI ENG SCI & TECH
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However, there are still no fast and accurate test methods at home and abroad to detect the real content of this type of modifier, which seriously hinders the requirements for the authenticity, objectivity and measurement of construction quality in project management.
Although it has been reported to detect by infrared spectroscopy, nuclear magnetic resonance, gel permeation chromatography and Brookfield rotational viscosity method, the detection accuracy is not high or the detection cost is too high
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Embodiment 1
[0024] Blind sample detection of modified asphalt by a well-known company
[0025] It is assumed that the amount of modifier in the modified asphalt with a known amount of modifier is X, and the amount of modifier in the modified asphalt with an unknown amount of modifier is X'.
[0026] (1) Use the matrix asphalt and modifier SBS provided by the company to prepare the SBS content as X (%) 1.0000, 2.0000, 3.0000, 4.0000, 5.000 and 6.000, a total of 6 samples, each taking W grams (about 1.5 grams, Accurate to 0.0001g), dissolved in 50mL of chloroform (that is, 6 groups of modified asphalt solutions with known SBS mixing amount are prepared);
[0027] (2) Add 10 mL of 0.2M bromine water to each of the 6 groups of modified asphalt solutions prepared in step (1) with a known amount of SBS blended. After stirring and reacting for 1 hour at 35°C, add 10 mL of 200 g / L Potassium iodide solution, stirred for 30 minutes;
[0028] (3) Add 0.2M sodium thiosulfate solution dropwise to each of the...
Embodiment 2
[0034] Blind sample detection of modified asphalt by a well-known company
[0035] It is assumed that the amount of modifier in the modified asphalt with a known amount of modifier is X, and the amount of modifier in the modified asphalt with an unknown amount of modifier is X'.
[0036] (1) Use the matrix asphalt and modifier SBS provided by the company to prepare the SBS content as X (%) 1.0000, 2.0000, 3.0000, 4.0000, 5.000 and 6.000, a total of 6 samples, each taking W grams (about 2 grams, Accurate to 0.0001g), dissolved in 50mL of chloroform (that is, 6 groups of modified asphalt solutions with known SBS mixing amount are prepared);
[0037] (2) Add 10 mL of 0.2M bromine water to each of the 6 groups of modified asphalt solutions prepared in step (1) with a known amount of SBS blended. After stirring the solution for 2 hours at 25°C, add 10 mL of 200g / L Potassium iodide solution, stir and react for 5 minutes;
[0038] (3) Add 0.2M sodium thiosulfate solution dropwise to each of...
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Abstract
The invention discloses a potentiometric-titration-based method for detecting the doping amount of a modifying agent in modified asphalt. The method comprises the following steps of: preparing a modified asphalt solution with a known doping amount of modifying agent and a modified asphalt solution with an unknown and to-be-detected doping amount of modifying agent; adding unsaturated bond addition agent for treatment; then adding a potassium iodide solution for treatment; then performing oxidation-reduction titration with a sodium thiosulfate solution, and determining the volume of the consumed sodium thiosulfate solution through potentiometric titration; drawing a standard curve according to the volume of the consumed sodium thiosulfate solution in the modified asphalt solution with the known doping agent and the doping amount of the modifying agent; and calculating the doping amount of the modifying agent in the modified asphalt to be detected according to the volume of the consumed sodium thiosulfate solution in the modified asphalt solution with the doping agent to be detected, and the standard curve. The method can effectively overcome the influence of a dark background of asphalt and depositions generated during a titration process to conventional titration analysis, and quickly and accurately detect the doping amount of the modifying agent in the modified asphalt, thus guaranteeing the control on production and processing quality of modified asphalt.
Description
Technical field [0001] The invention relates to a method for measuring the mixing amount of an asphalt modifier based on potentiometric titration. Background technique [0002] Ordinary road traffic asphalt has a wide molecular weight distribution, and its composition and structure determine that the asphalt is easy to soften at high temperatures and brittle at low temperatures, which is difficult to meet the requirements of modern traffic. Polymer modified asphalt is the addition of some high-molecular polymers to the asphalt, and the polymer is evenly dispersed in the asphalt by shearing, stirring and other methods to form an asphalt-polymer blend material. It uses the good physical and chemical properties of the polymer to To make up for the defects of asphalt itself, thereby improving the road performance of asphalt materials, and improving the service level and service life of asphalt pavements. In polymer modified asphalt, styrene-butadiene-styrene block rubber (SBS) and s...
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