Huang Liuyun, Wei Guogao, Lan Zhuxin, Chen Yuliang, Li Tun
School of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China.
Materials (Basel). 2024 Feb 20;17(5):970. doi: 10.3390/ma17050970.
To promote resourceful utilization of argon oxygen decarburization (AOD) slag, this research developed a new three-ash stabilized recycled aggregate with AOD slag, cement, fly ash (FA), and recycled aggregate (RA) as raw materials. The AOD slag was adopted as an equal mass replacement for fly ash. The application of this aggregate in a road base layer was investigated in terms of its mechanical properties and mechanistic analysis. First, based on a cement: FA ratio of 1:4, 20 sets of mixed proportion schemes were designed for four kinds of cement dosage and AOD slag replacement rates (/%). Through compaction tests and the 7-day unconfined compressive strength test, it was found that a 3% cement dosage met the engineering requirements. Then, the unconfined compressive strength test, indirect tensile strength test, compressive rebound modulus test, and expansion rate test were carried out at different age thresholds. The results showed that the mixture's strength, modulus, and expansion rate increased initially and then stabilized with age, while the strength and modulus initially increased and then decreased with increasing . Secondly, based on X-ray diffraction (XRD) and scanning electron microscopy (SEM) used to analyze the mechanism, it was found that the strength, modulus, and expansion rate of the new material can be promoted by blending AOD slag, due to its ability to fully stimulate the hydration reaction and pozzolanic reaction of the binder. Finally, based on the strength and modulus results, = 3% was identified as the optimal ratio, which provides a reference point for the effective application of AOD slag and RA in road base materials.
为促进氩氧脱碳（AOD）炉渣的资源化利用，本研究以AOD炉渣、水泥、粉煤灰（FA）和再生骨料（RA）为原料，开发了一种新型的三灰稳定再生骨料。采用AOD炉渣等量替代粉煤灰。从力学性能和机理分析方面研究了这种骨料在道路基层中的应用。首先，基于水泥与FA的比例为1:4，针对四种水泥用量和AOD炉渣替代率（/%）设计了20组配合比方案。通过压实试验和7天无侧限抗压强度试验，发现3%的水泥用量满足工程要求。然后，在不同龄期进行了无侧限抗压强度试验、间接抗拉强度试验、抗压回弹模量试验和膨胀率试验。结果表明，混合料的强度、模量和膨胀率随龄期先增加后稳定，而强度和模量随增加先增加后降低。其次，基于X射线衍射（XRD）和扫描电子显微镜（SEM）分析机理，发现通过掺入AOD炉渣可以促进新材料的强度、模量和膨胀率，这是由于其能够充分激发胶凝材料的水化反应和火山灰反应。最后，根据强度和模量结果，确定 = 3%为最佳比例，为AOD炉渣和RA在道路基层材料中的有效应用提供了参考依据。
