A micro-expansion water purification sludge alkali-activated grouting material for backfilling of urban abandoned underground pipelines and a preparation method thereof

CN118878296BActive Publication Date: 2026-08-28XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Patent Information

Application Number
CN202411138212.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-19
Publication Date
2026-08-28
Estimated Expiration
2044-08-19

AI Technical Summary

Technical Problem

[0018]综上所述，这些专利申请在环境风险评估、性能稳定性、实际应用局限性、长期性能评估以及技术创新性和原创性等方面可能存在共性缺点

Benefits of technology

[0037]本发明基于净水污泥的微膨胀碱激发注浆材料中，添加了破絮剂，该破絮剂包括酒石酸钾钠(NaKC4H4O6)，其中，酒石酸钾钠水解产生的钠离子置换出净水污泥中的铝离子，铝离子通过与酒石酸根螯合成为可容性络合物，破坏了净水污泥絮凝的胞状结构，使得净水污泥在更少的水中具有更高的流动度，而矿粉、粉煤灰和激发剂能凝结固化污泥，氢氧化钠和二水石膏作为激发剂，增加的OH-浓度有助于打断粉煤灰颗粒中的Si-O、Al-O键，溶液中的Ca2+发生胶凝反应，生成水化硅酸铝和水化硅酸钙等凝胶物质。其次，二水石膏作为硫酸盐激发剂能够与矿物掺合料形成新的胶凝物质填充孔隙，增强材料的密实性和强度。硫酸盐激发剂还能够加速矿物掺合料的凝结和硬化过程，提高早期强度且具有更好的耐久性和抗渗性，膨胀剂中的碱性物质与矿粉中的氢氧化钙发生反应，生成大量的水化铝酸钙(C2S)和水化铁酸钙(C3A)。膨胀剂中的硅酸盐矿物在高温下发生分解，释放出气体，这进一步加剧了体积膨胀，使得管道内部更加充实。加速水化进程提强度，且不影响其流动性能，混合浆体的初始流动度应大小290mm，30min经时损失不小于260mm，等注浆材料的基本工艺要求，28d强度在1.5MPa以上。可以看出，本发明能够将城市净水厂产生的净水污泥进行有效利用，并作为地下管道回填注浆材料，即实现了净水污泥的回用，同时避免了用水泥、并且具有环保的优势。

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Abstract

The present application belongs to solid waste utilization technical field, disclose a kind of for city waste underground pipeline backfilling micro-expansion water purification sludge alkali excitation grouting material and its preparation method, by mass fraction, its raw material includes: water purification sludge 67 parts, mineral powder 18~21 parts, fly ash 18~21 parts, quartz sand 16 parts, excitation agent 4~7 parts, potassium sodium tartrate 0.1~0.3 parts, coagulant 0.1~0.4 parts, water reducing agent 0.2~0.4 parts, expanding agent 0.4~0.7 parts;Excitation agent includes sodium hydroxide and gypsum dihydrate, by mass fraction, the grouting material contains gypsum dihydrate 3.5~5, sodium hydroxide 0.5~2 parts.The present application can effectively utilize the water purification sludge generated by city water purification plant, and as underground pipeline backfilling grouting material, that is, realizes the reuse of water purification sludge, while avoiding using cement, and has the advantage of environmental protection.
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