VISCOELASTIC ANALYSIS OF THE MARSHALL TEST
VISCOELASTIC ANALYSIS OF THE MARSHALL TEST
复制标题
马歇尔试验的粘弹性分析
DOI：
--
复制
发表时间：
1964
期刊：
影响因子：
--
通讯作者：
J. P. Chen
中科院分区：
文献类型：
--
作者：
E. Krokosky;J. P. Chen
由于目前在路面混合料设计中采用的大多数流行且相关性较好的试验都不是基于粘弹性理论，或者这些试验的流变含义被隐藏，因此对马歇尔试验的流变含义进行了研究。使用改良的马歇尔设备和标准马歇尔试验样本进行应力松弛试验。通过马歇尔试验、/B/用马歇尔设备获得的应力松弛数据和/C/用三轴尺寸样本/4X 8/进行的试验，在/A/和稳定性/流动值之间建立了相关性。对不同沥青含量的应力-松弛数据采用了不同的松弛因子，以确定作为温度函数的松弛速率。尝试通过形状系数从马歇尔试验的马歇尔载荷-变形值预测材料的工程模量。尽管该试样形状/或尺寸/系数似乎与沥青含量无关，但其普遍适用性尚未确定。还进行了动态测试，以进一步验证材料的短时应力松弛模量以及动态模量与低温马歇尔松弛模量的关系。
SINCE MOST OF THE POPULAR AND BETTER CORRELATED TESTS PRESENTLY EMPLOYED IN THE DESIGN OF MIXES FOR PAVEMENTS ARE NOT BASED ON VISCOELASTIC THEORY OR THE RHEOLOGICAL IMPLICATIONS OF THESE TESTS ARE HIDDEN, A STUDY WAS CONDUCTED INTO THE RHEOLOGICAL MEANING OF ONE SUCH PROCEDURE, THE MARSHALL TEST. STRESS-RELAXATION TESTS WERE CONDUCTED WITH MODIFIED MARSHALL EQUIPMENT AND USING THE STANDARD MARSHALL TEST SPECIMENS. CORRELATIONS WERE MADE BETWEEN /A/ AND STABILITY/FLOW VALUES BY THE MARSHALL TEST, /B/ THE STRESS-RELAXATION DATA OBTAINED WITH MARSHALL EQUIPMENT, AND /C/ TESTS WITH TRIAXIAL SIZE SPECIMENS /4X8/. VARIOUS SHIFT FACTORS WERE EMPLOYED ON THE STRESS-RELAXATION DATA FOR DIFFERENT ASPHALT CONTENTS IN ORDER TO DETERMINE THE RATE OF RELAXATION AS A FUNCTIONAL OF TEMPERATURE. AN ATTEMPT WAS MADE TO PREDICT THE ENGINEERING MODULUS OF THE MATERIAL FROM THE MARSHALL LOAD-DEFORMATION VALUES OF THE MARSHALL TEST BY MEANS OF A SHAPE FACTOR. THE UNIVERSAL APPLICABILITY OF THIS SPECIMEN SHAPE /OR DIMENSION/ FACTOR HAS YET TO BE DETERMINED FOR DIFFERENT AGGREGATE GRADATIONS ALTHOUGH IT SEEMS TO BE INDEPENDENT OF ASPHALT CONTENT. DYNAMIC TESTS WERE ALSO CONDUCTED TO FURTHER VERIFY THE SHORT TIME STRESS-RELAXATION MODULUS OF THE MATERIAL AND THE RELATION OF THE DYNAMIC MODULUS TO LOW-TEMPERATURE MARSHALL RELAXATION MODULUS.