Experimental Study on Road Performance of Cement Stabilized Macadam Incorporating Recycled Aggregate

doi:10.16552/j.cnki.issn1001-1625.2025.0765

Abstract

Abstract:

In response to the demand for the resource utilization of construction waste， and taking the promotion and application of recycled aggregates prepared from waste concrete in road engineering materials as the background， the road performance and effect of cement stabilized macadam incorporating recycled aggregate were discussed. By controlling the cement content in the mixture and the replacement rate of recycled aggregates， laboratory tests such as heavy compaction test， unconfined compressive strength test and splitting tensile strength test were carried out to study the road performance of cement stabilized macadam incorporating recycled aggregate. Subsequently， a field test of abutment backfilling was conducted to verify the compaction effect and engineering applicability of cement stabilized macadam incorporating recycled aggregate. The results show that the addition of recycled aggregates significantly reduces the road performance of cement stabilized macadam incorporating recycled aggregate. When the cement content in the mixture is 3% to 5%（mass fraction）， as the replacement rate of recycled aggregates increases from 0% to 100%（mass fraction）， the optimal moisture content of cement stabilized macadam incorporating recycled aggregate gradually rises， with a maximum increase of 85.04%， and the maximum dry density gradually decreases， with a maximum reduction of 11.89%. Both the unconfined compressive strength and the splitting tensile strength gradually decline. The maximum reduction rates for the two are 51.98% and 50.42% respectively. Cement stabilized macadam incorporating recycled aggregate not only meets the compaction standards and has good uniformity， but also has a dense and stable core sample， which can be used for abutment backfilling. These findings provide experimental support for the application and promotion of recycled concrete aggregates in cement stabilized macadam incorporating recycled aggregate used for abutment backfilling.

Key words: recycled aggregate, cement stabilized macadam incorporating recycled aggregate, road engineering, mechanical strength, abutment backfilling, compaction characteristic

CLC Number:

U414

HUANG Zhengtao, GUAN Junxiao, NIU Yapeng, CUI Yicheng, HE Xiongfei. Experimental Study on Road Performance of Cement Stabilized Macadam Incorporating Recycled Aggregate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(1): 359-366.

Figures/Tables 10

References 15

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Material	Particle size /mm	Apparent density /（g·cm^-3）	Water absorption rate/%	Clay content /%	Elongated and flaky particle content/%	Crushing value/%
Recycled coarse aggregate	19~26.5	2.613	3.68	1.53	7.5	—
	9.5~ < 19	2.691	4.79	1.89	8.3	25.32
	4.75~ < 9.5	2.712	3.98	2.01	8.2	—
Gravel	19~26.5	2.808	0.83	0.11	13.2	—
	9.5~ < 19	2.829	0.95	0.25	13.9	11.15
	4.75~ < 9.5	2.843	1.30	0.30	14.3	—

Material	Particle size /mm	Apparent density /（g·cm^-3）	Water absorption rate/%	Clay content /%	Elongated and flaky particle content/%	Crushing value/%
Recycled coarse aggregate	19~26.5	2.613	3.68	1.53	7.5	—
	9.5~ < 19	2.691	4.79	1.89	8.3	25.32
	4.75~ < 9.5	2.712	3.98	2.01	8.2	—
Gravel	19~26.5	2.808	0.83	0.11	13.2	—
	9.5~ < 19	2.829	0.95	0.25	13.9	11.15
	4.75~ < 9.5	2.843	1.30	0.30	14.3	—

Material	Particle size/mm	Apparent density/（g·cm^-3）	Water absorption rate/%	Particle content（ < 0.075 mm）/%
Recycled fine aggregate	0~ < 4.75	2.26	12.1	4.43
Natural sand	0~ < 4.75	2.72	10.3	8.08

Material	Particle size/mm	Apparent density/（g·cm^-3）	Water absorption rate/%	Particle content（ < 0.075 mm）/%
Recycled fine aggregate	0~ < 4.75	2.26	12.1	4.43
Natural sand	0~ < 4.75	2.72	10.3	8.08