Biopolymers have become popular in geotechnical engineering as they provide a carbon-neutral alternative for soil solidification. Xanthan gum (XG) and jute fiber (JF) were selected to solidify the Yellow River dredged soil. The mechanical behavior of solidified (SDS) was investigated using series uniaxial compression splitting tension tests at different XG JF contents lengths. results indicate that on 28th day, unconfined compressive strength (UCS) values SDS samples reached 2.83 MPa tensile...

The Yellow River sediment (YRS) is an important potential soil resource for the mine land reclamation and ecological restoration in arid regions of northern China. However, it has shortcomings poor water-holding capacity needs to be modified urgently. Therefore, two types biochar, namely rice husk biochar (RHB) coconut shell (CSB), were utilized this study modify YRS compared with ash (RHA). Some engineering properties (MYRS), including pore structure, water retention, permeability,...

Although vertical cutoff walls can effectively contain groundwater pollution, barriers constructed using conventional cement-bentonite-soil (CBS) mixtures exhibit poor permeability and produce considerable CO2 during cement production. The dredged sludge ash (DSA) has potential to be used as an eco-friendly source for building because of the remarkable pozzolonicity. In this study, a mixture consisting MgO-activated bentonite was develop low permeable DSA-bentonite-sand (MDBS) barrier...

Cement-based solidification is a widely used sustainable technology for transforming waste dredged sludge (DS) into backfill materials. This study developed novel solidification/oxidization synergistic (SOS) method, using Portland cement as binder and sodium persulfate (SP) an oxidant, treating the organic DS with different fulvic acid (FA) content. The results demonstrated that adding SP could significantly improve UCS of cement-solidified doped FA. When FA content was 4%, 28-day sample 25%...

Cement solidification was a widely used method to broaden the resource utilization of dredged sludge. However, organic matter in sludge limit application cement solidification. The fulic acid (FA) simulate natural With increase FA content, gradually changed from low-liquid-limit clay high-liquid-limit clay. unconfined compression test showed that strength cement-solidified (CDS) decreased with content. influence mechanism on revealed by water content test, hydration heat scanning electron...

The combination of chemical stabilization and fiber reinforcement can simultaneously improve the strength ductility dredged sediment. polypropylene (PF) straw (SF) were respectively used as artificial natural reinforcements cement-stabilized sediment (CDS). A series unconfined compressive (UCS) tests conducted to investigate effects cement content, length water content on mechanical properties PF-reinforced CDS (CPFDS) SF-reinforced (CSFDS). Furthermore, cementation-reinforcement mechanism...

The use of biopolymers in combination with natural plant fibers to solidify soils has proven effective civil engineering, as they are not only considered sustainable, but also have excellent mechanical properties. However, the specific quantitative relationships between strength and residual moisture content (RMC) cured system still unclear. In this study, solidification effects xanthan gum (XG, weight ratio dry soil 1.5%) jute fiber (JF, 0.6% length 20 mm) on Yellow River dredged (YRDS)...

The curing stress is an important parameter affecting the mechanical properties of cement-treated soil. This paper presents effects on compressive and physical dredged sediment (CDS). plasticity behavior CDS affected by both cement content stress, whereas particle size mainly influenced content. can reduce compressibility significantly slightly change compression postyielding stage, which related to structural in process. Finally, strength factor was proposed predict CDS.

To improve the durability of pumice lightweight aggregate concrete applied in cold and drought areas, sodium silicate-modified waste tire rubber powder is used to treat concrete. The studied mainly river lining structures. It will be eroded by water flow impact ice other injuries, resulting reduced durability, addition modified reduce damage. including mass loss rate relative dynamic elastic modulus with different silicate dosages power particle sizes, analyzed under freeze-thaw cycles,...

Using coal-based solid waste (CSWM) to develop artificial soil (AS) can solve the shortage of planting in mine ecological restoration and realize resource utilization waste, which is a very promising research direction. This study used three common CSWM, coal gangue (CG), fly ash (FA), desulfurization gypsum (DG), prepare AS. The physicochemical properties AS, such as bulk density, specific gravity, porosity, field water capacity, available nutrient content, pH value EC value, were studied....

Helical nano-ribbons with a large aspect ratio were obtained through the self-assembly of an achiral amphiphile. The symmetry breaking is attributed to orderly but twisted stacking terpyridine groups. In addition, morphology assemblies can be tuned by coordination between and Zn2+ ion.

Biochar has attracted much attention in the field of geo-environmental engineering as a carbon-neutral alternative for soil amendment. In this study, effects biochar dosage, type, and particle size on permeability physical properties compacted silty clay were investigated. And prediction model coefficient biochar-amended (BAS) was established. Based microscopy test results, influence mechanism analyzed. Results revealed that adding different types affected consistency limits, specific...

Solidification treatment with cementitious binder is an effective way to reduce environmental hazards of sewage sludge. Two binders, i.e., ordinary Portland cement (OPC) and sulfo-aluminate (SAC), were compared in this study treat the The strength solidified sludge (SSS) changes microscopic characteristics before after analyzed through analysis methods. effect organic matter on SSS also discussed. results showed that lower than clay no matter, filtrate extracted from can weaken cementation...

Cement-stabilized dredged sediment (CDS) when used as a new road construction material cannot only solve the problem of abandoned disposal, but also effectively save natural soil resources. This study aimed to evaluate strength and permeability CDS establish corresponding prediction models from perspective stabilization mechanism. The soil-water composition pore size distribution were investigated by nuclear magnetic resonance (NMR) technique. results demonstrated that more liquid water...