海相淤泥轻质固化土的原位化学发泡法制备与性能表征

打开文本图片集

中图分类号：TU528.2 文献标志码：A doi：10.12415/j.issn.1671-7872.24181

Preparation and Properties Characterization of Lightweight Solidified Soil of Marine Silt by In-situ Chemical Foaming Method

LI Zhenghao， JIANG Yao， CHEN Shuang， XU Liang， FAN Chuangang， LI Jiamao （School of Materials Science & Engineering， Anhui University of Technology， Maanshan ， China）

Abstract： Using mineral-based cementitious material as a curing agent and aluminum powder paste as a foaming agent，light-weightsolidified soil dredged marine silt were prepared by in-situ foaming method.The influence lawof curing agent content （1 ：10-1：4）， foaming agent content （0.025%-0.100% ）， and water-to-binder ratio （0.6-1.2） on the unconfined compressive strength （UCS），bulk density， water absorption，softening coeficient of the samples were systematically investigated. The microstructural evolution and solidification mechanism were analyzed with X ray diffraction （XRD） and scanning electron microscopy （SEM） techniques. The results show that increasing the curing agent content promotes the gas-generating reaction of aluminum powder， forming a more developed pore structure. This achieves a reduction in the bulk density to 0.75t/m3 while improving the UCS to 1.06MPa .However， higher foaming agent content and water-to-binder ratio lead to a simultaneous decrease in both bulk density and UCS. Under the optimal mix proportion （curing agent content of 1：4， foaming agent content of 0.100% ， and water-tobinder ratio of 1.0）， the 28d sample exhibits excellent comprehensive performances， with a UCS of 1.06MPa ，bulk density of 0.75t/m3 ，and softening coeficient of 0.84.The enhanced performance is attributed to the formation of a network structure composed of hydration products such as calcium silicate hydrate （C—S—H）and etringite （AFt）， which effectively bonds particles while regulating pore distribution，thereby achieving a synergistic optimization of lightweight characteristicsand mechanical properties.This study provides important insights for the development of soft soil stabilization materials in land reclamation engineering.

Keywords： marine silt; stabilized soil; cementitious materials;unconfined compressive strength;bulk density;insitu foaming; foundationsettlement; solid wasteutilization

近年来，我国沿海地区经济快速发展、人口持续增长，土地资源短缺已成为制约该区域可持续发展的关键因素[1-2]。（剩余13133字）