PDF全文阅读

聂庆科^1,2 , 李华伟^1,3 , 贾向新^1,2 , 王英辉^1,2 , 茆玉超^1,2 , 王俊明^1,3 , 杨海朋^1,3

 

(1. 中冀建勘集团有限公司 , 石家庄   050227; 2. 河北省岩土技术创新中心 , 石家庄    050227;

3. 河北省工业固体废弃物综合利用重点实验室 , 石家庄   050227)

摘  要: 劣质脱硫石膏与粉煤灰不仅占用土地资源 , 还会对环境造成污染 。通过分析劣质脱硫石膏与粉煤灰的结构和成分 , 研究其形成低强度地质聚合物作为厂房地基填方材料的可行性 。结果表明 : 劣质脱硫石膏和粉煤灰在碱激发下可形成低强度地质聚合物 , 其结构以多聚体为主要骨架 , 通过钙矾石搭接 、脱硫石膏及粉煤灰微集料填充包裹黏结而成 ; 在 Dg ∶ Fa= 50 ∶ 50 质量比混合后 , 加入质量比为 3%氢氧化钠 , 能够形成具有较好承载能力的地质聚合物回填材料 , 且具有良好的水稳性 , 膨胀性能的影响忽略不计 ; 现场试验混合材料  (Dg ∶ Fa= 50 ∶ 50) 铺填厚度为 30 cm、碾压遍数为 8 遍时 , 压实度可达到 0. 94, 压缩模量可达到 10. 74 MPa, 7 d 的轻型动力触探击数在 70 击以上 , 平板载荷试验承载力特征值达到 150 ~ 200 kPa, 变形模量达到 52. 7 ~ 56. 5 MPa;工程应用表明 , 建筑最终沉降为 35. 44~44. 07 mm, 平均沉降速率小于 0. 01 mm/d。研究对拓展地质聚合物在工程回填领域应用具有重要参考价值 , 为实现“ 以废治废 ” 的可持续岩土工程建设提供了新的技术模式。

关键词: 劣质脱硫石膏 ; 粉煤灰 ; 地质聚合物 ; 填方材料 ; 固废资源化利用

中图分类号: TU 443      文献标志码: A      文章编号: 1005-8249 (2026) 04-0015-10

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 003

 

Study and Application of Inferior Desulfurization Gypsum and

Fly Ash Geopolymer as Filling Materials

NIE Qingke1,2 , LI Huawei1,3 , JIA Xiangxin1,2 , WANG Yinghui1,2 , MAO Yuchao1,2 ,

WANG Junming1,3 , YANG Haipeng1,3

(1. China Hebei Construction & Geotechnical Investigation Co. , Ltd. , Shijiazhuang 050227, China;

2. Geotechnical Engineering Technology Research Center of Hebei Province, Shijiazhuang 050227, China;

3. Key Laboratory for Industrial Solid Waste Comprehensive Utilization of Hebei Province, Shijiazhuang 050227, China)

Abstract : Poor quality desulfurization gypsum and fly ash not only occupy land resources but also cause environmental pollution.  By analyzing the structure and composition of inferior desulfurization gypsum and fly ash, the feasibility of forming low

strength geopolymer as a filling material for factory foundation is studied.  The results showed that low-quality desulfurization gypsum and fly ash can form low strength geopolymers under alkaline stimulation, with a structure mainly composed of polymers as the skeleton, which are bonded by overlapping calcium aluminate, filling and wrapping desulfurization gypsum and fly ash micro aggregates; After mixing at a mass ratio of Dg ∶ Fa = 50 ∶ 50, adding a mass ratio of 3% sodium hydroxide can form a geopdymer backfill material with good load-bearing capacity, and it has good water stability, with the expansion performance having negligible influence; When the on-site test mixed material (Dg ∶  Fa = 50 ∶ 50) is laid with a thickness of 30 cm and rolled 8 times, the compaction degree can reach 0. 94, the compression modulus can reach 10. 74 MPa, and the 7-day light dynamic penetration number is over 70. The bearing capacity of the plate load test can reach 150~200 kPa, and the deformation modulus can reach 52. 7~56. 5 MPa; Engineering applications have shown that the final settlement of the building ranges from 35. 44 to 44. 07 mm, and the average settlement rate of the two monitoring cycles is less than 0. 01 mm/d. This research holds significant reference value for expanding the application of geopolymer in the field of engineering backfill, and provides a new technical model for achieving " reducing waste with waste" in sustainable geotechnical engineering construction.

Key words: inferior desulfurization gypsum; fly ash; geopolymer; filling material; resource utilization of solid waste