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Peer-reviewedCC BY 4.0Polymers

Effects of a Self-Developed Composite Modifier on the Compressive Strength, Shrinkage Behavior, and Microstructure of Cement-Stabilized Macadam

  • Dawei Ma1
  • Pengyi Wan1
  • Yong Huang2
  • Wenrui Yang3
  • Zhaoguo Liu3
  • Qi Li3
  1. 1Nanchang Construction Investment Group Co., Ltd., Nanchang 330038, China
  2. 2Jiangxi Port and Shipping Construction Investment Group Co., Ltd., Nanchang 330000, China
  3. 3School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China
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Abstract

Cement-stabilized macadam is widely used in pavement base layers but is susceptible to shrinkage-induced cracking. This study evaluated a self-developed composite modifier, designated DX-3, with the aim of improving volumetric stability while maintaining compressive strength. Mixtures with cement dosages of 4.0%, 4.5%, and 5.0% and DX-3 dosages of 0–2.0% were tested for unconfined compressive strength (UCS), drying shrinkage, temperature shrinkage, and microstructural characteristics using SEM and EDS. The UCS generally increased with DX-3 dosage up to 1.5% and then stabilized or slightly decreased. At 4.5% cement and 1.5% DX-3, the 7 d and 28 d UCS reached 5.67 and 7.43 MPa, respectively. Adding 1.5% DX-3 reduced the total drying shrinkage coefficient by 21.54–30.93%, the average temperature shrinkage coefficient by 2.71–3.72%, and the peak coefficient by 3.45–4.58%. The greatest temperature shrinkage sensitivity occurred at 0 to −10 °C. SEM observations indicated a more continuous cementitious matrix with more gel-like microstructural features after DX-3 modification. Overall, DX-3 improved shrinkage-related volumetric stability without compromising basic compressive strength.

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Cite

BibTeXRIS
BibTeX
@article{ma2026effects,
  title = {{Effects of a Self-Developed Composite Modifier on the Compressive Strength, Shrinkage Behavior, and Microstructure of Cement-Stabilized Macadam}},
  author = {Dawei Ma and Pengyi Wan and Yong Huang and Wenrui Yang and Zhaoguo Liu and Qi Li},
  journal = {Polymers},
  year = {2026},
  month = oct,
  doi = {10.3390/polym18202470},
  url = {https://www.mdpi.com/2073-4360/18/20/2470},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Effects of a Self-Developed Composite Modifier on the Compressive Strength, Shrinkage Behavior, and Microstructure of Cement-Stabilized Macadam
AU  - Dawei Ma
AU  - Pengyi Wan
AU  - Yong Huang
AU  - Wenrui Yang
AU  - Zhaoguo Liu
AU  - Qi Li
PY  - 2026
DA  - 2026/10/01
JO  - Polymers
DO  - 10.3390/polym18202470
UR  - https://www.mdpi.com/2073-4360/18/20/2470
AB  - Cement-stabilized macadam is widely used in pavement base layers but is susceptible to shrinkage-induced cracking. This study evaluated a self-developed composite modifier, designated DX-3, with the aim of improving volumetric stability while maintaining compressive strength. Mixtures with cement dosages of 4.0%, 4.5%, and 5.0% and DX-3 dosages of 0–2.0% were tested for unconfined compressive strength (UCS), drying shrinkage, temperature shrinkage, and microstructural characteristics using SEM and EDS. The UCS generally increased with DX-3 dosage up to 1.5% and then stabilized or slightly decreased. At 4.5% cement and 1.5% DX-3, the 7 d and 28 d UCS reached 5.67 and 7.43 MPa, respectively. Adding 1.5% DX-3 reduced the total drying shrinkage coefficient by 21.54–30.93%, the average temperature shrinkage coefficient by 2.71–3.72%, and the peak coefficient by 3.45–4.58%. The greatest temperature shrinkage sensitivity occurred at 0 to −10 °C. SEM observations indicated a more continuous cementitious matrix with more gel-like microstructural features after DX-3 modification. Overall, DX-3 improved shrinkage-related volumetric stability without compromising basic compressive strength.
SN  - 2073-4360
ER  -