首页|Stabilisation of estuarine sediments with an alkali-activated cement for deep soil mixing applications

Stabilisation of estuarine sediments with an alkali-activated cement for deep soil mixing applications

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
In this work,an alternative alkali-activated cement(AAC)made of ladle slag precursor mixed with so-dium hydroxide and sodium silicate has been developed to enhance the bearing capacity of estuarine soils in coastal conditions via deep soil mixing(DSM).The AAC was optimized to use a low reactivity precursor(ladle slag)and to deal with a contaminated high-water content natural sediment cured under water.The material performance was analysed by comparison to a mixture made with Portland cement and cured in the same conditions.Flexural and unconfined compressive strength tests as well as seismic waves measurements after 3-,7-,14-and 28-d curing were performed to obtain a relationship between elastic stiffness and strength with curing time for both mixtures.Remarkably,the AAC mix demonstrated superior strength results,exhibiting almost double flexural and compressive strengths after 28 d compared to the Portland cement mix.The AAC mix also showed a higher rate of stiffness increase than the Portland cement mix,which has a higher initial stiffness at young ages but lower stiffness evolution.Leachate analysis confirmed that the proposed AAC could effectively immobilise any contaminants from soil or precursors.The effect of curing under stress was analysed in triaxial compression tests and found to be insignificant,indicating that laboratory data obtained without stress curing can represent the material's behaviour in a DSM column,which will cure under the weight of the column.

Alkaline-activationSteel slagSubmerged curingSeismic wave measurementsLeachate analysisCuring under stress

Claver Pinheiro、Sara Rios、António Viana da Fonseca、Nuno Cristelo

展开 >

Centre of Physics of Minho and Porto Universities(CF-UM-UP),Azurém Campus,University of Minho.Guimarães,4800-058,Portugal

CONSTRUCT-GEO,Faculty of Engineering,University of Porto,Rua Dr.Roberto Frias,Porto,s/n 4200-465,Portugal

CQ-VR,School of Science and Technology,University of Trás-os-Montes e Alto Douro,Vila Real,5000-801,Portugal

CNPq(Brazilian council for scientific and technological development) scholarship of the"Science without borders"programsupport of MCTES/FCT(Portuguese Sci-ence and Technology Foundation of Portuguese Ministry of Science and Technology)Base Funding of the CONSTRUCT-Instituto deI&Dem Estruturas e Construcoesnational funds through FCT/MCTES(PIDDAC)

201465/2015-9CEECIND/04583/2017UIDB/04708/2020

2024

10.1016/j.jrmge.2023.08.020

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(4)
  • 72