水泥稳定再生碎石的路用性能试验研究

doi:10.16552/j.cnki.issn1001-1625.2025.0765

摘要/Abstract

摘要：

针对建筑垃圾资源化利用的需求，以废弃混凝土制备再生骨料在道路工程材料中的推广应用为背景，探讨了水泥稳定再生碎石的路用性能及效果。通过控制混合料中水泥掺量和再生骨料替代率，开展了重型击实试验、无侧限抗压强度试验和劈裂抗拉强度试验等室内试验，研究了水泥稳定再生碎石的路用性能。随后，进行了台背回填现场试验，以验证水泥稳定再生碎石的压实效果和工程适用性。结果表明：再生骨料的掺入明显降低了水泥稳定再生碎石的路用性能；当混合料中水泥掺量为3%~5%（质量分数）时，随着再生骨料替代率由0%增至100%（质量分数），水泥稳定再生碎石的最佳含水率逐步上升，最大增幅为85.04%，最大干密度逐步降低，最大降幅为11.89%，无侧限抗压强度和劈裂抗拉强度均逐步下降，二者最大降幅分别为51.98%与50.42%；水泥稳定再生碎石不仅压实度达标、均匀性良好，且芯样密实稳定，可以用于台背回填。本研究可为混凝土再生骨料在台背回填水泥稳定再生碎石中的应用推广提供试验支撑。

关键词: 再生骨料, 水泥稳定再生碎石, 道路工程, 力学强度, 台背回填, 压实特性

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

中图分类号:

U414

黄正涛, 关骏骁, 牛亚鹏, 崔艺铖, 何雄飞. 水泥稳定再生碎石的路用性能试验研究[J]. 硅酸盐通报, 2026, 45(1): 359-366.

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.

图/表 10

图1 混凝土再生骨料的宏观形貌

Fig.1 Macrostructure of recycled concrete aggregate

表1 粗骨料的物理性能指标

Table 1 Physical performance indicators of coarse aggregate

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	—

表2 细骨料的物理性能指标

Table 2 Physical performance indicators of fine aggregate

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

表3 水泥的主要试验指标

Table 3 Main test indicators of cement

Testing index

Density/

（g·cm^-3）

Specific surface

area/（m²·kg^-1）

Setting time/min

Flexural strength/MPa

Compressive strength/MPa

表4 水泥的主要化学成分

Table 4 Main chemical composition of cement

Composition	SiO₂	CaO	Al₂O₃	Fe₂O₃	SO₃	K₂O	MgO
Mass fraction/%	2.56	45.00	13.10	3.55	1.21	0.85	7.14

图2 吸水率与压碎值随再生骨料替代率的变化

Fig.2 Variation of water absorption rate and crush value with recycled aggregate replacement rate

图3 最佳含水率随再生骨料替代率的变化

Fig.3 Variation of optimal moisture content with

图4 最大干密度随再生骨料替代率的变化

Fig.4 Variation of maximum dry density with recycled aggregate replacement rate recycled aggregate replacement rate

图5 无侧限抗压强度随再生骨料替代率的变化

Fig.5 Variation of UCS with recycled aggregate replacement rate

图6 劈裂抗拉强度随再生骨料替代率的变化

Fig.6 Variation of STS with recycled aggregate replacement rate

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