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堿激發(fā)粉煤灰－高爐礦渣粉固化鑄造廢砂用作路基填料研究

Research on the Use of Alkali Activated Fly Ash Blast Furnace Slag Powder Solidified Casting Waste Sand as Roadbed Filling Material

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陳廣升

（廣州一建建設集團有限公司，廣州 510000)

摘要：為將鑄造廢砂經(jīng)土工地質(zhì)聚合反應用做路面基層材料，以不同摻量高爐礦渣粉、粉煤灰為膠凝材料，NaOH 溶液為激發(fā)劑，研究混合料的固化時間及無側(cè)限抗壓強度變化規(guī)律，并進行了混合料微觀形貌分析。結(jié)果表明：鑄造廢砂顆粒粒徑大，堿性溶液難以激發(fā)其活性并將其固化；僅摻入 5% 粉煤灰無法使鑄造廢砂固化；同時摻入高爐礦渣粉、粉煤灰，可發(fā)生土工聚合反應；提高高爐礦渣粉摻量、堿性溶液濃度可縮短固化時間；增加粉煤灰摻量，將延長固化時間；粉煤灰摻量為 5% 、高爐礦渣粉摻量為 15% 時，無側(cè)限抗壓強度最大；相同高爐礦渣粉摻量時，抗壓強度隨粉煤灰摻量增大而增大；提高堿性溶液濃度，使混合料抗壓強度降低；混合料養(yǎng)護 28 d 時，可獲得約 85% 的抗壓強度；堿激發(fā)高爐礦渣粉、粉煤灰可產(chǎn)生大量凝膠，充填密實鑄造廢砂顆粒間孔隙，提高混合料密實度，同時生成沸石晶體，共同提高混合料抗壓強度。研究成果可為鑄造廢砂用作路基填料提供理論依據(jù)。

關鍵詞：路基工程；鑄造廢砂；堿激發(fā) ；工業(yè)廢渣；路用性能

中圖分類號：U414 文獻標志碼：A 文章編號： 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

作者簡介：陳廣升（1986—），男，本科，高級工程師，研究方向：工程管理、工程技術。

收稿日期：2024-06-07