Low-temperature testing method for asphalt or asphalt mortar
A technology of asphalt mortar and low-temperature test, which is applied in the direction of applying stable tension/compression to test the strength of materials and the preparation of test samples, which can solve the problems of high cost and lack of evaluation of asphalt low-temperature performance research parameters, etc.
Inactive Publication Date: 2016-01-27
朱涵
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[0005] In order to solve the problems existing in the prior art, the present invention provides a low-temperature test method for asphalt or asphalt mortar, which overcomes the problems of lack of evaluation and high cost of asphalt low-temperature performance research parameters in the prior art
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[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0027] (1) Relevant tests were carried out on two kinds of asphalt mortar specimens. The first is No. 90 asphalt, the second is SBS asphalt, and four groups are made in total. The first group is No. 90 asphalt at -10°C, the second is SBS asphalt at -10°C, and the third group is No. 90. Bitumen at -30°C, the fourth group is SBS bitumen at -30°C. Three test pieces in each group. The compression testing machine is set at a loading rate of 2mm / min until the specimen fails. Trial mold (static pressure forming trial mold). The test piece is a cylinder with a diameter of 50±2mm and a height of 50±2mm. Health conditions: 24 hours at room temperature, and then placed in a low-temperature box at -10°C and -30°C for 24 hours, keeping the distance not less than 10mm. The ratio of asphalt to fine sand is 1:9.98 (9.2%), and the maximum particle size of fine sand is le...
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The invention discloses a low-temperature testing method for asphalt or asphalt mortar. The low-temperature testing method comprises the following steps: manufacturing a test piece; after cooling the test piece to room temperature, putting the test piece into a refrigerator with pre-set temperature of X1 for storing; putting the test piece onto a universal testing machine and carrying out pressing loading until the test piece is damaged; recording maximum pressure stress, maximum pressure strain and time t needed from loading to damaging, and calculating stiffness S=maximum pressure stress / maximum pressure strain; setting the temperature of the refrigerator to be X2 and repeating to obtain t and S; and calculating: relative temperature rheological rate=[t(X1)-t(X2)] / (X2-X1) and relative temperature stiffness rate=[S(X2)-S(X1)] / (X2-X1). According to the low-temperature testing method provided by the invention, two parameters including the relative temperature rheological rate and the relative temperature stiffness rate, which are obtained by a test, provide quantitative indexes for evaluating low-temperature performances of the asphalt and the asphalt mortar.
Description
technical field [0001] The invention relates to a test method for building materials, in particular to a low-temperature test method for asphalt or asphalt mortar. Background technique [0002] Asphalt should have excellent road performance and be widely used in roads. However, as a material test, there is no good low-temperature performance evaluation method and evaluation index, and the low-temperature evaluation system is not perfect. At present, my country's standards still use the 5°C ductility index to evaluate the low-temperature performance of rubber asphalt. However, relevant studies have shown that the 5°C ductility index cannot well characterize the ductility of rubber asphalt at low temperatures, and it needs further research and improvement as a low-temperature evaluation index for modified asphalt. Therefore, based on the limitations of the current asphalt low temperature evaluation index in my country, it is of great significance to conduct research on the a...
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Inventor 朱涵
Owner 朱涵