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陈广升

 

（广州一建建设集团有限公司 ，广州 510000)

摘   要 ：为将铸造废砂经土工地质聚合反应用做路面基层材料 ， 以不同掺量高炉矿渣粉 、粉煤灰为胶凝材  料 ，NaOH 溶液为激发剂 ，研究混合料的固化时间及无侧限抗压强度变化规律 ，并进行了混合料微观形貌分析。 结果表明：铸造废砂颗粒粒径大 ，碱性溶液难以激发其活性并将其固化 ；仅掺入 5% 粉煤灰无法使铸造废砂固  化 ；同时掺入高炉矿渣粉 、粉煤灰 ，可发生土工聚合反应 ；提高高炉矿渣粉掺量 、碱性溶液浓度可缩短固化时  间 ；增加粉煤灰掺量 ，将延长固化时间 ；粉煤灰掺量为 5% 、高炉矿渣粉掺量为 15% 时 ，无侧限抗压强度最大； 相同高炉矿渣粉掺量时 ，抗压强度随粉煤灰掺量增大而增大 ；提高碱性溶液浓度 ，使混合料抗压强度降低 ；混  合料养护 28 d 时 ，可获得约 85% 的抗压强度 ；碱激发高炉矿渣粉 、粉煤灰可产生大量凝胶 ，充填密实铸造废砂  颗粒间孔隙 ，提高混合料密实度 ， 同时生成沸石晶体 ，共同提高混合料抗压强度。研究成果可为铸造废砂用作  路基填料提供理论依据。

关键词：路基工程 ；铸造废砂 ；碱激发 ；工业废渣 ；路用性能

中图分类号：U414           文献标志码：A           文章编号： 1005- 8249   (2025)  04- 0117- 06

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .04.022

 

CHEN Guangsheng

 (Guangzhou Yijian Construction Group Co., Ltd.，Guangzhou 510000, China）

Abstract：In order to use casting waste sand as pavement base material by geotechnical geopolymerization reaction, blast furnace slag powder (5%, 10%, 15%, 20%), fly ash (5%, 10%) gelling material, NaOH solution (concentration 20%, 25%) as excitatory agent, the study of curing time of the mixture and the law of change of the unconfined compressive strength, and the micro-morphological analysis of the mixture. The results show that: casting waste sand particles with large particle size, alkaline solution is difficult to stimulate its activity and curing; only 5% fly ash can not make the casting waste sand curing; at the same time, blasting furnace slag powder, fly ash, geopolymerization reaction can occur; increase the dosage of blasting furnace slag powder, the concentration of alkaline solution can shorten the curing time; increase the dosage of fly ash, will extend the curing time; 5% of the dosage of fly ash, the dosage of blast furnace slag powder For 15% fly ash dosage, the maximum unconfined compressive strength; the same blast furnace slag powder dosage, the compressive strength increases with the increase in fly ash dosage; increase the concentration of alkaline solution, so that the compressive strength of the mixture is reduced; mixture maintenance 28 d, you can get about 85% of the compressive strength; alkali excitation of blast furnace slag powder, fly ash can be produced in large quantities to produce a gel, filling and compacting of casting sand particles between the pores to improve the compactness of the mix, while generating zeolite crystals, which together can produce a large amount of gel, filling and compacting casting sand particles between the pores to improve the compactness of the mix, while generating zeolite crystals. At the same time, zeolite crystals are generated to improve the compressive strength of the mixture. The research results can provide theoretical basis for the casting waste sand used as roadbed filler.

Keywords: roadbed engineering；casting waste sand；alkali excitation；industrial waste residue；roadworthiness 

作者简介：陈广升（1986—），男，本科，高级工程师，研究方向：工程管理、工程技术。

收稿日期：2024-06-07