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首页> 外文会议>International Symposium on Asphalt Emulsion Technology: Manufacturing, Application, and Performance, Nov 11-14, 1999, Washington, DC >The SCB test on bound granular materials
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The SCB test on bound granular materials

机译：粘结颗粒材料的SCB测试

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A general interest in emulsion bound granular materials has arose for environmental and labour-health reasons and therefore the improvement and ways of determination (functional quality control) of mechanical properties gain importance. The tensile strength of bound granular materials is an important parameter for defining the limit state in structural calculations and for comparing materials. Usual tests for determination of this property are tensile tests in various versions e.g. (direct) uni-axial, (indirect or wedge) splitting and bending. In this paper results of an investigation on an alternative test method, the Semi Circular Bending test (SCB) are described. Advantages of this test are the ease of obtaining specimen, by coring and sawing, and the favourable way of load introduction, by compression and by low stresses near the loading plates, thereby reducing the risk of undesired failure modes. Tests are carried out for comparing SCB and Indirect (splitting) Tensile tests (ITT) and for determination of repeatability and discrimination-ability between mixes. Variations in the tests were 11 mix types (binder type and content, gradation and recycled asphalt), 2 test temperatures, 2 load rates and notched and unnotched specimen. A total of about 420 specimen are tested. The results of both tests are values for stiffness, strength and several measures of energy (toughness). In this paper strength is chosen as the leading parameter. Coefficients of variation (cv) for ITT and SCB strength on series of respectively 4 and 8 specimens are found to be on average 0.16. The rankings of results in both tests are found to be the same in most cases. Effects of variation in binder content can be demonstrated with both tests. A higher binder content results in higher strengths in case of cement and cement-emulsion. Effects of gradation seem to result in different outcomes in different tests. The test results seem to be dependent on the investigated temperatures and loading rates according to usual findings on bituminous bound granulates. By use of the ITT and the SCB different mechanisms may be measured, depending on the type of material.
机译：出于环境和劳动健康的原因，人们普遍关注乳液结合的粒状材料，因此机械性能的改进和测定方法（功能质量控制）变得尤为重要。结合的粒状材料的抗张强度是在结构计算中定义极限状态和比较材料的重要参数。用于确定该性能的通常测试是各种版本的拉伸测试，例如， （直接）单轴（间接或楔形）分裂和弯曲。在本文中，描述了对另一种测试方法半圆弯曲测试（SCB）的研究结果。该测试的优点是易于通过取芯和锯切来获得试样，以及通过压缩和在加载板附近施加低应力来引入载荷的有利方式，从而降低了不希望的破坏模式的风险。进行测试以比较SCB和间接（分裂）拉伸测试（ITT），并确定混合物之间的可重复性和辨别能力。测试的变化是11种混合料类型（粘合剂类型和含量，等级和再生沥青），2种测试温度，2种负载率以及有缺口和无缺口试样。总共测试了约420个样品。两种测试的结果均为硬度，强度和几种能量（韧性）量度的值。本文选择强度作为主要参数。发现分别在4个和8个样品系列上的ITT和SCB强度的变异系数（cv）平均为0.16。在大多数情况下，两种测试的结果排名均相同。两种测试均可证明粘合剂含量变化的影响。在水泥和水泥乳液的情况下，较高的粘结剂含量导致较高的强度。在不同的测试中，渐变效果似乎会导致不同的结果。根据对沥青结合的颗粒的通常发现，测试结果似乎取决于所研究的温度和加载速率。通过使用ITT和SCB，可以测量不同的机制，具体取决于材料的类型。

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