CN107560951A - Half-flexible pavement asphalt skeleton and cement mortar boundary strength method of testing - Google Patents
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- 239000011083 cement mortar Substances 0.000 title claims abstract description 30
- 238000010998 test method Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000007373 indentation Methods 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- 239000011800 void material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 22
- 238000004088 simulation Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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Abstract
本发明提供一种半柔性路面沥青混合料骨架与水泥砂浆界面强度测试方法，属于路面材料强度测试技术领域，解决目前试验方法难以测试半柔性路面沥青混合料骨架与水泥砂浆界面力学强度的问题。本发明使用纳米压痕测试方法，首先通过室内试验制作半柔性路面试件；然后，对半柔性路面按照测试仪器要求进行测试样品的切割处理，并选取材料界面特性具有代表性的样品备用；最后，使用纳米压痕仪对样品特征界面进行压痕测试，获取材料界面的硬度、弹性模量、蠕变函数、断裂韧度、界面结合力等力学参数表征半柔性路面界面力学强度特性。本发明具有简便直观特点，可推广到已建成路面使用状况的评价，测试参数可与数值模拟方法对接，促进数值模拟方法发展。The invention provides a method for testing the interface strength of asphalt mixture skeleton and cement mortar on semi-flexible pavement, which belongs to the technical field of strength testing of pavement materials and solves the problem that the current test method is difficult to test the interface mechanical strength of asphalt mixture skeleton and cement mortar on semi-flexible pavement. The present invention uses the nano-indentation test method, and first makes semi-flexible road test specimens through indoor tests; then, cuts the semi-flexible road surface according to the requirements of the testing instrument, and selects representative samples with material interface characteristics for future use; finally , using a nano-indentation instrument to perform an indentation test on the characteristic interface of the sample, and obtain mechanical parameters such as hardness, elastic modulus, creep function, fracture toughness, and interface bonding force of the material interface to characterize the mechanical strength characteristics of the semi-flexible pavement interface. The invention has the characteristics of simplicity and intuition, and can be extended to the evaluation of the use status of the built road surface, and the test parameters can be connected with the numerical simulation method, so as to promote the development of the numerical simulation method.
Description
技术领域technical field
本发明是一种半柔性路面沥青混合料骨架与水泥砂浆界面强度测试方法，属于路面材料强度测试技术领域。The invention relates to a method for testing the interface strength of a semi-flexible pavement asphalt mixture skeleton and cement mortar, and belongs to the technical field of pavement material strength testing.
背景技术Background technique
半柔性路面是一种以开级配大空隙沥青混合料为基体，灌注流动性好、强度高的特制水泥砂浆而形成的一种新型复合路面结构类型。半柔性路面兼有柔性路面无接缝、行车舒适性高的优点和刚性路面承载力强、耐磨、耐久性好的优点。Semi-flexible pavement is a new type of composite pavement structure formed by pouring special cement mortar with good fluidity and high strength based on open-graded large-void asphalt mixture. Semi-flexible pavement combines the advantages of seamless flexible pavement and high driving comfort with the advantages of strong bearing capacity, wear resistance and durability of rigid pavement.
半柔性路面由于其铺筑方式与构成材料较普通路面更为复杂，其强度形成机理也与沥青路面和水泥路面有较大差别，其中界面处力学行为更是复杂。Semi-flexible pavement is more complex than ordinary pavement due to its paving method and constituent materials, and its strength formation mechanism is also quite different from that of asphalt pavement and cement pavement, and the mechanical behavior at the interface is even more complicated.
半柔性路面的研究最早在国外出现，被用于喷气式飞机跑道的试验，作为耐热路面进行试验铺筑，研究证实半柔性路面可以在不增加费用的情况下提高路面的高温稳定性并延长路面使用寿命。我国国内从20世纪90年代开始进行半柔性路面研究。1986年，同济大学林绣贤教授主持了有关方面的课题，并于当年年底在广东省惠深线上修建了试验路，经过两年的行车使用，效果良好。目前国内外对半柔性路面的力学强度研究主要分布在基质沥青混合料的改进、水泥砂浆的优化和路用性能的测定三个方面。The research on semi-flexible pavement first appeared in foreign countries, and it was used in the test of jet runway as a heat-resistant pavement. pavement service life. In my country, research on semi-flexible pavements began in the 1990s. In 1986, Professor Lin Xiuxian of Tongji University presided over related subjects, and built a test road on the Huishen Line in Guangdong Province at the end of that year. After two years of driving, the effect was good. At present, the research on the mechanical strength of semi-flexible pavement at home and abroad is mainly distributed in three aspects: the improvement of matrix asphalt mixture, the optimization of cement mortar and the measurement of road performance.
与普通沥青路面不同，半柔性路面在铺筑大空隙沥青混合料骨架的基础之上，又进行了水泥砂浆的灌注，并需要一段时间的养生才能最终成型，这种方法使半柔性路面的整体结构十分密实。从胶浆理论分析，半柔性路面结构是一种多级空间网络结构体系，在粗、细、微三级分散系中，以沥青胶浆的凝胶结构、水泥砂浆晶体及胶凝体的水泥石形成双重网络结构系，表现出很大的密实度及较高的c、值，因此兼有柔性及刚性材料的双重性能。理论分析方法对半柔性路面的结构体系进行了分析，但限于目前的研究进展，难以将理论与实际结合进行推广证明。Different from ordinary asphalt pavement, semi-flexible pavement is paved on the basis of asphalt mixture skeleton with large voids, and cement mortar is poured, and it takes a period of curing to finally form. This method makes the overall structure of semi-flexible pavement Very dense. From the analysis of mortar theory, the semi-flexible pavement structure is a multi-level space network structure system. In the coarse, fine and micro three-level dispersion system, the gel structure of asphalt mortar, cement mortar crystals and cement of gel Stone forms a double network structure system, showing great compactness and high c, Therefore, it has the dual properties of flexible and rigid materials. The theoretical analysis method analyzes the structural system of the semi-flexible pavement, but limited by the current research progress, it is difficult to combine theory with practice for promotion and proof.
从微观角度分析，沥青与水泥水化颗粒间的相互吸附以及水泥水化晶体穿过沥青膜与矿料的结合是半柔性路面特有的界面构成方式，水泥可以使沥青中的凝胶体数量增加，胶浆结构致密性加强，水化产物与沥青以物理结合方式构成网状结构，并可以弥补混合料内部缺陷以及提高沥青与集料粘附性。微观尺度的分析证明了水泥砂浆与沥青混合料骨架界面之间具有更为复杂的结合方式，但无法获取界面处具体的力学强度大小。From a microscopic point of view, the mutual adsorption between asphalt and cement hydration particles and the combination of cement hydration crystals passing through the asphalt film and mineral aggregates are the unique interface formation methods of semi-flexible pavements. Cement can increase the number of gels in asphalt , The density of the mortar structure is enhanced, and the hydration product and asphalt form a network structure in a physical combination, which can make up for the internal defects of the mixture and improve the adhesion between the asphalt and the aggregate. The analysis at the microscopic scale proves that there is a more complex bonding mode between the cement mortar and the asphalt mixture skeleton interface, but the specific mechanical strength at the interface cannot be obtained.
水泥砂浆在与沥青混合料基体结合之后，对结构本身的强度有较大的提高作用，而作为两种材料之间的界面部分，对半柔性路面的整体强度有着直接的影响。沥青混合料经典的力学研究方法大多是通过马歇尔实验、车辙试验等方法进行宏观力学特性的实验，对与路面材料的细观力学研究仍缺少具体的表征试验方法。After the cement mortar is combined with the asphalt mixture matrix, it can greatly improve the strength of the structure itself, and as the interface part between the two materials, it has a direct impact on the overall strength of the semi-flexible pavement. Most of the classic mechanical research methods of asphalt mixture are experiments on macroscopic mechanical properties through Marshall experiment, rutting test and other methods. There is still a lack of specific characterization test methods for the mesoscopic mechanical research of pavement materials.
与之宏观力学实验类似，沥青类材料通常采用水煮法或水浸法评价沥青的粘附等级，侧面反映沥青材料的界面强度。这种方法是一种经验法，无法在实验中得到材料界面的强度、蠕变参数等具体的数值，目前沥青类材料界面强度的获取一直没有较好的测试方法。Similar to the macromechanical experiment, asphalt materials are usually evaluated by water boiling or water immersion method to evaluate the adhesion level of asphalt, which reflects the interface strength of asphalt materials. This method is an empirical method, and it is impossible to obtain specific values such as the strength and creep parameters of the material interface in the experiment. At present, there is no good test method for obtaining the interface strength of asphalt materials.
因此，针对半柔性路面沥青混合料骨架与水泥砂浆界面强度测试困难的问题，本发明采用一种纳米压痕测试方法，在仪器试验中通过对探测位置荷载与位移关系的评价，获取沥青混合料骨架与水泥砂浆界面强度、蠕变参数等数据，为沥青类材料的界面强度测试提供一种新思路。这种新方法可以在多种材料中应用，且可以推广到已建成路面使用状况的评价中，对研究路面材料界面强度具有重要借鉴意义，具有推广应用价值。Therefore, in view of the difficulty in testing the interface strength of the semi-flexible pavement asphalt mixture skeleton and cement mortar, the present invention adopts a nano-indentation test method to obtain the asphalt mixture by evaluating the relationship between the load and displacement at the detection position in the instrument test. The data of the interface strength and creep parameters between the skeleton and cement mortar provide a new idea for the interface strength test of asphalt materials. This new method can be applied to a variety of materials, and can be extended to the evaluation of the use status of the built pavement. It has important reference significance for the study of the interface strength of pavement materials, and has the value of popularization and application.
发明内容Contents of the invention
(1)技术问题(1) Technical issues
本发明目的是提供一种半柔性路面沥青混合料骨架与水泥砂浆界面强度测试方法，通过对已有半柔性路面试件断面界面处进行纳米压痕测试分析，解决目前试验方法难以测试半柔性路面沥青混合料骨架与水泥砂浆界面力学强度的问题，为路面材料细微观力学研究提供新思路。The purpose of the present invention is to provide a method for testing the interface strength of asphalt mixture skeleton and cement mortar on semi-flexible pavement. By performing nano-indentation test and analysis on the cross-section interface of existing semi-flexible pavement test pieces, it is difficult to test semi-flexible pavement with current test methods. The problem of the mechanical strength of the interface between asphalt mixture skeleton and cement mortar provides a new idea for the study of microscopic mechanics of pavement materials.
(2)技术方案(2) Technical solution
为了解决当前对于半柔性路面沥青混合料骨架与水泥砂浆界面强度测试困难的问题，本发明使用纳米压痕测试方法，首先通过室内试验制作半柔性路面试件；然后，对半柔性路面按照测试仪器要求进行测试样品的切割处理，并选取材料界面特性具有代表性的样品备用；最后，使用纳米压痕仪对样品特征界面进行压痕测试，获取材料界面的弹性模量、蠕变、界面结合力等力学参数，并对参数进行分析处理。In order to solve the current difficulty in testing the interface strength between the asphalt mixture skeleton and cement mortar on semi-flexible pavements, the present invention uses a nano-indentation test method to first make semi-flexible pavement test pieces through indoor tests; It is required to cut the test sample, and select a sample with representative material interface characteristics for backup; finally, use a nano-indentation instrument to perform an indentation test on the characteristic interface of the sample to obtain the elastic modulus, creep, and interface bonding force of the material interface and other mechanical parameters, and analyze and process the parameters.
(3)有益效果(3) Beneficial effect
半柔性路面兼有柔性路面无接缝，行车舒适性高的优点和刚性路面承载力强，耐磨、耐久性好的优点。半柔性路面与普通沥青路面相比，其高温稳定性能比普通沥青路面强数倍，所以适合在公路收费口、港口码头、货运站等场所以及长大陡坡路段使用。沥青路面材料的骨架结构与界面粘结强度是影响路面强度的最主要因素，但以往对沥青路面材料的研究多是从提高沥青的粘度方面提高路面材料界面粘结强度，对于路面不同材料之间界面力学强度缺乏一种直观的方法进行测试。The semi-flexible pavement has the advantages of seamless flexible pavement and high driving comfort, and the rigid pavement has the advantages of strong bearing capacity, wear resistance and durability. Compared with ordinary asphalt pavement, semi-flexible pavement has several times stronger high-temperature stability than ordinary asphalt pavement, so it is suitable for use in highway toll gates, port terminals, freight stations and other places, as well as long and steep road sections. The skeleton structure and interfacial bond strength of asphalt pavement materials are the most important factors affecting the pavement strength. However, most of the research on asphalt pavement materials in the past is to improve the interface bond strength of pavement materials from the aspect of increasing the viscosity of asphalt. Interfacial mechanical strength lacks an intuitive method to test.
本发明采用的纳米压痕测试法不仅可以在半柔性路面沥青混合料骨架与水泥砂浆界面可以使用，而且能够推广到其它路面不同材料之间界面测试中，也适用于已建成路面的界面强度测试。纳米压痕测试所得参数是一种微细观参数，在目前数值模拟方法普及的背景下，这种方式采集的参数也易于与数值模拟细观参数结合起来，互相验证，促进数值模拟方法发展。The nano-indentation test method adopted in the present invention can not only be used on the interface between the asphalt mixture skeleton and cement mortar on semi-flexible pavement, but also can be extended to the interface test between different materials on other pavements, and is also suitable for the interface strength test of the built pavement . The parameters obtained by the nanoindentation test are a kind of microscopic parameters. Under the background of the current popularization of numerical simulation methods, the parameters collected in this way can also be easily combined with the numerical simulation mesoscopic parameters to verify each other and promote the development of numerical simulation methods.
具体实施方式detailed description
本发明提供一种半柔性路面沥青混合料骨架与水泥砂浆界面强度测试方法，具体实施步骤如下：The invention provides a method for testing the interface strength of a semi-flexible pavement asphalt mixture skeleton and cement mortar. The specific implementation steps are as follows:
(1)优选玄武岩集料用于制备半柔性路面多孔沥青混合料骨架，确定该沥青混合料的集料配合比、最佳沥青用量，采用旋转压实仪制备空隙率为28％的沥青混合料试件，以便灌注水泥砂浆；(1) Optimal basalt aggregates are used to prepare the semi-flexible pavement porous asphalt mixture skeleton, determine the aggregate mix ratio of the asphalt mixture, the optimal amount of asphalt, and use a rotary compactor to prepare an asphalt mixture with a void ratio of 28% Test pieces for pouring cement mortar;
(2)确定水泥砂浆的水灰比、外加剂，制备水泥灌注砂浆，使其流动度在9～11秒之间，在平板振动台上将水泥砂浆充分、均匀灌注到多孔沥青混合料试件中，确保水泥砂浆灌满多孔沥青混合料试件，在标准养护室养生28天；(2) Determine the water-cement ratio and admixture of the cement mortar, prepare the cement pouring mortar, and make the fluidity between 9 and 11 seconds, fully and evenly pour the cement mortar into the porous asphalt mixture specimen on the flat vibrating table In the process, ensure that the cement mortar is filled with the porous asphalt mixture specimen, and it is cured in the standard curing room for 28 days;
(3)采用切割机和打磨机将半柔性路面试件按照纳米压痕仪测试要求制备试样，挑选表面平整、完整并清楚显现沥青混合料骨架与水泥砂浆界面结构的试样用于纳米压痕试验；(3) Use a cutting machine and a grinder to prepare samples from semi-flexible pavement test pieces according to the requirements of the nanoindentation tester, and select samples with a flat, complete surface and clearly showing the interface structure of the asphalt mixture skeleton and cement mortar for nanoindentation mark test;
(4)采用纳米压痕仪对该试样的界面硬度、弹性模量、蠕变函数、断裂韧度、界面结合力进行测试，每一目标界面至少选取三个位置进行测试，以消除该目标界面不均匀性对试验结果影响；(4) The interface hardness, elastic modulus, creep function, fracture toughness, and interface bonding force of the sample are tested by a nano-indentation instrument, and at least three positions are selected for each target interface to eliminate the target. Influence of interface inhomogeneity on test results;
(5)取每一目标界面不同位置硬度、弹性模量、蠕变函数、断裂韧度、界面结合力的试验结果平均值，用这些参数的平均值在微观层次上表征半柔性路面沥青混合料骨架与水泥砂浆界面力学强度特性。(5) Take the average value of the test results of hardness, elastic modulus, creep function, fracture toughness, and interface bonding force at different positions of each target interface, and use the average value of these parameters to characterize the semi-flexible pavement asphalt mixture at the microscopic level Mechanical strength characteristics of skeleton and cement mortar interface.
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| CN113310800A (en) * | 2021-05-14 | 2021-08-27 | 扬州大学 | Asphalt and cement mortar interface tensile strength testing device and testing method |
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