CN-122016912-A - Method for determining mixing amount of anti-icing and snow-melting filler based on structure, performance and snow-melting effect of asphalt mixture

Abstract

The invention relates to a method for determining the mixing amount of anti-icing and snow-melting fillers based on the structure, performance and snow-melting effect of asphalt mixtures, which comprises the steps of performing test piece molding on asphalt mixtures with different mixing amounts of snow-melting fillers, and respectively carrying out density, freeze thawing splitting and ice condensation rate tests, and drawing a double-coordinate axis graph according to the obtained void ratio, the freeze thawing splitting strength ratio and the ice condensation rate. The void ratio is in the range of 2.0% -3.5%, the freeze thawing splitting strength ratio is more than 80%, the ice condensation rate is less than 55%, and the range meeting the conditions is the target mixing amount range of the snow melting filler. The evaluation method can effectively determine the range of the addition amount of the snow melting filler in the snow melting asphalt mixture, so that the snow melting asphalt mixture can meet the normal road performance requirement of the asphalt pavement while ensuring the snow melting effect.

Inventors

• BU HAILING
• WANG PENG
• LAI JINGXIAO
• WANG QIAN
• KANG YI
• ZHOU XIAOGUANG
• ZHAO JING
• LV QIQI
• WANG YUE
• WANG ZHEN
• LI XIAOHUA
• XU XIN
• YANG YANSHENG
• SUN HAIJIAO
• WANG ZHE
• SHA CHUAN
• ZHANG MINGHAO

Assignees

• 北京市政路桥建材集团有限公司
• 北京市政路桥股份有限公司
• 北京市政路桥正达道路科技有限公司
• 北京路新沥青混凝土有限公司

Dates

Publication Date

20260512

Application Date

20260128

Priority Date

20260113

Claims (6)

1. 1. According to the method, a double-axis graph is drawn according to the obtained void ratio, freeze thawing split strength ratio and ice condensation rate, a corresponding snow thawing filler doping amount range C1 with the void ratio ranging from 2.0% to 3.5% is determined in the void ratio curve, a snow thawing filler doping amount range C2 with the freeze thawing split strength ratio being more than 80% is determined in the freeze thawing split strength ratio curve, a snow thawing filler doping amount range C3 with the ice condensation rate being less than 55% is determined in the ice condensation rate, the snow thawing filler doping amount C at the overlapped part of C1, C2 and C3 is the target doping amount range, the test method of the ice condensation rate test comprises the steps of fixing a fixed-size cylinder on the upper end face of the test piece by using a sealing gel of insoluble water, injecting a certain amount of distilled water into the cylinder, placing the cylinder in an environment box with constant temperature condition for a period of time, taking out the distilled water according to the formula, and weighing the distilled water after the time is calculated: s=(m 0 -m)÷m 0 ×100% Wherein: s is the ice-condensing rate of the water-soluble polymer, M 0 the mass of the injected water, M: mass of remaining liquid water.
2. 2. The method of claim 1, wherein the fixed-size cylinder has a diameter of 6cm, the amount of distilled water injected is 30ml, and the freezing time is 60min.
3. 3. The method of claim 1, wherein the density test is performed according to the test method of highway engineering asphalt and asphalt mixture test procedure T0705-2011, and the void ratio of the test piece is calculated.
4. 4. A method according to claim 3, wherein in the density test, the test piece is immersed in water for a period of not more than 3 minutes during the weighing of the mass of the test piece in water.
5. 5. The method according to claim 1, wherein the freeze-thawing splitting test is performed according to the test method of T0729-2000 of Highway engineering asphalt and asphalt mixture test procedure, and the freeze-thawing splitting strength ratio of the test piece is calculated.
6. 6. The method of claim 1, wherein the test piece is formed to prepare a test piece according to the test method of highway engineering asphalt and asphalt mixture test procedure T0702-2011.

Description

Method for determining mixing amount of anti-icing and snow-melting filler based on structure, performance and snow-melting effect of asphalt mixture Technical Field The invention relates to a method for determining the mixing amount of an anti-icing and snow-melting filler based on the structure, performance and snow-melting effect of an asphalt mixture, and belongs to the technical field of highway asphalt pavement design. Background Road construction and operation are important components of national economy, and have important promotion effects on the national economy. In the road operation process, ensuring smooth traffic and driving safety are two challenges facing at present. Especially in large cities with increasingly severe traffic jams, the service capacity of the road becomes a decisive factor affecting the normal operation of the city. In cold climatic environment in winter, the road surface is easy to be frozen by snow often, ice and snow disasters are formed, the problems of reduced road surface adhesion coefficient, skidding of automobiles, out-of-control direction and the like are caused, and traffic jam and even paralysis are often caused. Therefore, various measures and means are necessary to remove the ice and snow on the road surface. While maintaining good road quality to provide sufficient service capability, the safety of the road is also increased to resist traffic accidents caused by bad weather. The snow-melting asphalt pavement is prepared by mixing snow-melting materials during pavement paving, and slowly separating out the snow-melting materials in the long-term use process, so that the snow-melting asphalt pavement has the effect of melting snow on the road surface. The vehicle ice and snow melting device has the advantages of actively, efficiently and continuously melting ice and snow from bottom to top, can realize continuous and durable ice and snow melting, avoids a series of adverse effects caused by using a large amount of snow melting agents, and improves the ice and snow melting efficiency under the rolling action of vehicle load. However, in practical applications, the amount of snow-melting filler added to the asphalt mixture is not as large as possible. Studies have shown that snow melt fillers can adversely affect the water stability of the mix. The water damage and rutting and cracking are parallel to three main disease forms of asphalt pavement of various grades in China. The asphalt mixture has insufficient water damage resistance, can generate pits on the pavement, and seriously affects the driving safety. Therefore, the blending amount of the snow melting filler should be controlled within a range, so that the snow melting asphalt mixture not only meets the requirement of active snow melting, but also meets the requirement of road performance. Disclosure of Invention The invention aims to provide a method for determining the mixing amount of a snow melting filler in a snow melting asphalt mixture, which is based on the structure, the performance and the snow melting effect of the asphalt mixture, and solves the problems that the water stability is affected by too much mixing of the snow melting asphalt mixture and the active snow melting effect cannot be achieved by too little mixing of the snow melting filler. The specific scheme of the invention is as follows: The method for determining the mixing amount of the anti-icing and snow-melting filler based on the structure, the performance and the snow-melting effect of the asphalt mixture comprises the steps of test piece molding, density, freeze thawing splitting, ice condensation rate detection and snow-melting filler mixing amount assessment; the test piece forming step comprises the following steps: Performing test piece molding according to a test method of Highway engineering asphalt and asphalt mixture test procedure T0702-2011; The density detection steps are as follows: testing according to a test method of highway engineering asphalt and asphalt mixture test procedure T0705-2011, and calculating to obtain the void ratio of the test piece; The freeze thawing cleavage detection steps are as follows: testing according to a test method of T0729-2000 of Highway engineering asphalt and asphalt mixture test procedure, and calculating to obtain a freeze thawing splitting strength ratio of a test piece; The ice condensation rate detection step comprises the following steps: Fixing a cylinder with fixed size on the upper end surface of a test piece by using a water-insoluble sealant, injecting a certain amount of distilled water into the cylinder, freezing in an environment box with constant temperature condition, taking out the distilled water in the cylinder after a period of time, weighing, and calculating the ice condensation rate according to the following formula. s=(m0-m)÷m0×100% Wherein: s ice-setting rate M 0 mass of injected water M mass of residual Water The evaluation method of the blending amount of