Abstract:
In order to achieve the coordination of cement treat aggregate base(CTAB) material mix proportion design between indoor experiment laboratory test and production practice, play the role of guidance to field construction, base on the analysis of the traditional course mix proportion design of semi-rigid base test, the course objectives were adjusted on the basis of the principle of production practice in harmony with indoor test. According to the new objective of the course, the equipment of vibration mixing, vibration molding and anti-scour was developed, standard test parameters were proposed, and numerical simulation of anti-scour test was carried out. The scour stress distribution of the scour specimen was clarified, which was used as the basis of analysis of anti-scour test for students. Through the analysis of physical index data, the students have made clear the physical significance of the optimum water content and the influence of three methods on the maximum dry density. Through the analysis of the mechanical index data, the students have made clear the influence of different test methods on the strength and the mechanism of producing this influence. Through the anti-scour test, the students are made clear that the functional indexes should be considered when determining the design cement dosage, and the numerical simulation can explain the test phenomenon well. Based on the new objectives of semi-rigid base mix design experiment, students understand the nature of mix design, in the level of technical requirements, it is not only to meet the intensity requirements, but also take into account the functional indicators, in the aspect of test design, not only to comply with the norms, but also have the spirit of innovation.
