Abstract
The composition and structure of cement‐stabilized macadam (CSM) is an important factor affecting its performance. Aiming at the typical suspension dense structure and skeleton dense structure, the static pressure and vibration methods were used to prepare the CSM samples. The three‐dimensional internal structure characteristics of CSM were analyzed and studied by industrial CT scanning technology. By using digital image and 3D reconstruction technology, the structural parameters such as the number of 3D voids, the gradation of voids, the distribution of voids along the height direction, and the coefficient of variation of the proportion of coarse aggregate area were obtained. The results show that more than 80% of the voids in CSM are less than 1 mm3, and the number of large voids of skeleton dense gradation is more than that of suspension dense gradation under the two compaction methods. The distribution of internal voids along the height of CSM specimens cannot be changed by the compaction mode, but the vibration method can reduce its void ratio. Under different compaction methods, the variation coefficient of the coarse aggregate area ratio of two kinds of CSM mixture generally has the same change trend, and the vibration method can make its inner structure more uniform.
Highlights
Academic Editor: Zhanping You e composition and structure of cement-stabilized macadam (CSM) is an important factor affecting its performance
Because this study mainly focuses on the influence of gradation and compaction method on the internal structure of CSM, the cement dosage of the test specimen was 5% and the compaction degree was 98% of the maximum dry density. e specimens were made by static compaction (JY) and vibration compaction method (ZD), respectively, based on the Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering [17]. e optimum moisture content and maximum dry density of the compaction test were shown in Table 2, in which the vibration time of vibration compaction was 120 s
The internal structure characteristics of CSM were studied by industrial Computed Tomography (CT) scanning. e effects of gradation and compaction methods on its internal structure void and coarse aggregate distribution uniformity were analyzed using digital image processing technology. e main conclusions are as follows: (1) More than 80% of the voids in CSM are smaller than 1 mm3, and the number of large volume voids of skeleton dense gradation, especially 0.1∼0.5 mm3, is more than that of suspended dense gradation
Summary
The 15 cm × 15 cm cylindrical CSM specimen was used. Combined with engineering application, the cement was P.O.42.5 and the type of aggregate was basalt. According to the gradation range in the Technical Guidelines for Construction of Highway Road-bases [16] and the existing research results of the research group, two kinds of cement-stabilized macadam gradation forms, skeleton dense structure and suspended dense structure, were selected and expressed by GJ and XF. Because this study mainly focuses on the influence of gradation and compaction method on the internal structure of CSM, the cement dosage of the test specimen was 5% and the compaction degree was 98% of the maximum dry density. E specimens were made by static compaction (JY) and vibration compaction method (ZD), respectively, based on the Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering [17]. E optimum moisture content and maximum dry density of the compaction test were shown, in which the vibration time of vibration compaction was 120 s. After curing at the standard condition for 28 days, the test sample was drilled by core drilling machine, cutting its both ends to obtain the scanning specimen of 10 cm × 10 cm CSM
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
