Terms Of Unconfined Compressive Strength Research Articles

Soil stabilization by reinforcing natural and synthetic fibers – A state of the art review

Expansive clays are present in many places across the world. They have an intrinsic volume change that causes fractures, differential settlements, heaves, and damage to the overlaying structures due to seasonal moisture variations. One of the most common treatments for expansive clay subgrades is fly ash (FA) stabilization. It also serves as a possible method for adequately disposing of FA. The inclusion of fibers further enhances the geotechnical properties of soil with FA. The objective of this review article is to examine how different natural and synthetic fibers affect the geotechnical properties of soil. Only peer-reviewed journals and proceedings papers were selected for review. Review of studies suggests that reinforcing soil with fibers is an effective, low-cost soil stabilizing technique with various geotechnical and environmental benefits. Review of the literature revealed that fly ash (FA) at various percentages raises the California Bearing Ratio (CBR) value up to 80–110%. Further, the inclusion of geofibres boosts the CBR values further by 40–50%. In terms of unconfined compressive strength, there has been a substantial improvement reported. The use of geofibres also reduced volume change in the soil (up to 94.4%). This review study will assist geotechnical engineers in stabilizing expansive soils using natural and synthetic fibers and researchers to perform future research.

Stabilization of Dredging Material from Rio Grande Harbor with Alkali-Activated Cements to Produce Masonry Elements

In this study, to give a new final disposal to the Dredged Sediments (DS) in the Port of Rio Grande, the manufacture of Compressed Earth Blocks (CEB) with the addition of alkali-activated cement (AAC) is proposed. This binder was produced by mixing Rice Husk Ash (RHA), Carbide Lime (CL), and Sodium Hydroxide Solutions (SHS). The methodology includes AAC optimization for the production of CEBs, considering their performance in terms of unconfined compressive strength (UCS), durability analysis by wetting and drying cycles, and the qualification of the blocks, according to strength and water absorption criteria. The results show that AAC is a satisfactory option to improve the mechanical performance of DS. After 28 days of curing, the CEBs pass the requirements established by the Brazilian standard NBR 8492 to be used in the execution of masonry without structural function in Brazil.

Optimisation of recycled concrete aggregates for cement-treated bases by response surface method

ABSTRACT Sustainability is a primary concern that needs to be addressed since infrastructure development requires significant natural resources. Using Recycled Concrete Aggregates (RCA) for road construction has numerous benefits in saving natural resources and the environment. In the present investigation, the demolition waste is being used for road construction, partially/fully replacing natural aggregates. The Cement Treated Recycled Concrete Aggregate (CTRCA) specimens were prepared at 3%, 5%, and 7% cement with various blends of RCA and Natural Coarse Aggregates (NCA) ranging from 0 to 100%. The strength characteristics in terms of Unconfined Compressive Strength (UCS), Flexural Strength (FS), Elastic Modulus, Indirect Tensile Strength (ITS) and durability tests were conducted on cured samples. Microstructural analysis using Scanning Electronic Microscope (SEM) revealed that the pores and cracks in the old mortar have a detrimental influence on the mechanical properties of CTRCA mixes. However, Energy Dispersive Spectroscopy (EDS) and durability tests have shown positive results. The Response Surface Method (RSM) was utilised to optimise the RCA and cement content in CTRCA mixes. The research resulted in the maximum possible RCA of up to 70% with a cement content of 5.8%, which met the Indian Road Congress (IRC) specifications for Cement Treated Bases (CTB).

Laboratory investigation of soil-aggregate-cement mixture

Cement stabilization improves physical and mechanical properties of geotechnical materials. However, numerous combinations of geotechnical materials and cement hinder to establish a pattern of mechanical behavior of cement-stabilized materials. Thus, this study aims to evaluate the mechanical behavior of soil-aggregate-cement mixtures (SAC) using high early-strength cement (HE), to contribute to dosage aspects and to ascertain their recommendation as base and/or subbase layers in heavy and very heavy volume roads. For this, SAC mixtures composed of different proportions of soil and aggregate (20:80 and 30:70) with 3, 5 and 7% of cement were produced and cured at different times (0, 7 and 28 days). Mechanical properties were assessed in terms of unconfined compressive strength (UCS), indirect tensile strength (ITS) and resilient modulus by repeated load triaxial test ( ) and by dynamic indirect tensile test ( ). A cement dosage study compared compressive and tensile strengths with acting stresses computed by mechanistic analysis of hypothetical pavements. This same procedure was also used for verifying the possibility of anticipating construction phases and reducing the traffic opening time, in this case a SAC mixture using Portland composite cement (PCC) was also evaluated. Results indicated that SAC-20:80 presented better mechanical behavior than SAC-30:70. Also, the cement content that led to the best mechanical behavior was 5%. All SAC mixtures with 5% HE had higher strength than the acting stresses interval computed for hypothetical pavements. SAC mixtures reached, at 7 and 3 days of curing, respectively, 80% and 60% of 28-days strength, which is the control parameter of Sao Paulo-DOT instructions for SAC. Findings indicated that, due to their good mechanical behavior, SAC mixtures are viable alternatives as layers in heavy and very heavy traffic pavements. Additionally, SAC’s high strengths at earlier curing times have shown their potential to reduce construction time.

Long-Term Stabilization/Solidification of Arsenic-Contaminated Sludge by a Blast Furnace Slag-Based Cementitious Material: Functions of CaO and NaCl.

Arsenic is a kind of element widely distributed in the environment that may pose a threat to the ecological environment and human health, while effective remediation and sustainable utilization of arsenic-containing sludge is a challenge. Based on stabilization/solidification blast furnace slag-based cementitious materials (BCMs), this study innovatively proposes to improve the arsenic (As) solidification efficiency and long-term stability by using the activation mode of CaO and NaCl. The effects of different factors on the properties of the BCM were measured by unconfined compressive strength (UCS) tests, X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The long-term stability and safety of the BCM were verified by leaching toxicity and improved three stage continuous extraction method (BCR) tests. Experimental results show that the addition of CaO provides conditions for the formation of ettringite (AFt), thus promoting the crystal growth of AFt. The addition of NaCl can promote the formation of Cl-AFt and play a good long-term stabilizing role. When the content of the alkali activator is 10% and the modulus is 1.0, the contents of CaO and NaCl are 10 and 1%, respectively. The BCM has the best efficiency in terms of UCS and As solidification. The UCS at 28 days was 5.4 MPa, and the leaching concentration of As was 0.309 mg/L, and the As solidification efficiency was up to 99.9%. In the improved BCR test, the proportions of residual and oxidizable states of arsenic increased by 19.6 and 13.5%, respectively, and the stability of heavy metals improved. These findings show that the BCM has good long-term stability and safety. Overall, this study shows that CaO and NaCl significantly increase the output of AFt and achieve the purpose of efficient and stable solidification of As by the BCM.

A feasibility study on production of concrete blocks using treated municipal solid waste leachate.

Increased water demand due to population growth and industrialization has led to increased water consumption. Hence, it is required to find an alternative to water in different industries. Concrete represents a remarkable water-consuming industry. The present study investigates whether the treated leachate of municipal landfills can be employed as a substitute for water in the concrete mixing scheme. For this purpose, concrete samples fabricated at different concentrations of treated leachates were compared to the control sample containing distilled water in terms of unconfined compressive strength (UCS) at the ages of 7 and 28days. The experimental results revealed treated leachate accelerated the cement setting time by nearly 15min and increased concrete slumping by 16%. The complete replacement of distilled water with treated leachate decreased UCS by 25% (from 50 to 38MPa). The scanning electron microscope (SEM) and ultrasonic results showed that a rise in the treated leachate content of concrete increased porosity. Increased porosity would reduce UCS. Leaking of heavy metals existing in the leachate should be also investigated for the solidified matrices. The toxicity characteristic leaching procedure (TCLP) revealed that heavy metals leaching in all the samples are in the acceptable range. Results have shown that the use of leachate up to a concentration of 20% can be used in concrete, and the solidified product can also stabilize the pollutants, successfully. It is a valuable finding because using treated leachate as a practical additive in the concrete can prevent environmental contamination.

Design of low volume road pavement of stabilized low plastic soil using fly ash geopolymer

The rapid development of any county depends upon the growing transportation facilities, especially the construction of good roads. A country like India has a large road network that plays an essential role in the development of the nation. For the construction of good roads, natural resources or traditional stabilizers were used. This paper deals with the use of nontraditional stabilizers for low plastic soil stabilization and states the further application in the design of low volume roads. For this, an experimental investigation was carried out on low plastic soil to enhance the engineering properties with the application of a nontraditional stabilizer (fly ash geopolymer). The feasibility of significant strength enhancement of fly ash geopolymer was observed in terms of unconfined compressive strength (UCS) and California Bering Ratio (CBR) for various curing days (0, to 28 days). Furthermore, the microstructural analysis was carried out via. Scanning Electronic Microscope (SEM) and X-ray diffraction (XRD) to understand the microstructural changes. The application of stabilized low plastic soil is demonstrated in the design of low volume road pavement as per Indian Roads Congress (IRC) SP:72–2015. Low-volume road design with stabilized materials shows a significant reduction in pavement thickness.

Stabilization of tropical soil using calcium carbide residue and rice husk ash

Many alternative stabilizers have been used in improving soil properties for road applications. However, they were mostly used to complement/partially replace cement or lime. This study seeks to use zero - cement/lime binders in the evaluation of engineering characteristics of soil stabilized with the best binary Calcium Carbide Residue (CCR) and Rice Husk Ash (RHA) treatment possible. The oxide compositions of the soil, CCR, and RHA were determined. The natural soil was subjected to index property tests), compaction, Soaked California Bearing Ratio (SCBR), Unconfined Compressive Strength(UCS), and erodibility. To achieve optimal CCR: RHA ratio, compaction and CBR were used. Atterberg limits, compaction, SCBR, Unconfined Compressive Strength, and erodibility were used to evaluate the engineering performance of the soil stabilized at 2, 4, 6, 8, 10% of the optimum CCR: RHA mix. The RHA is a class N pozzolan while the CCR's CaO of 61% indicates how cementitious the residue is. The soil sample is non-lateritic. CCR: RHA combined ratio of 40:60% offered the best strength and compaction performances. Further, the addition of the optimum CCR: RHA at 2, 4, 6, 8, 10% improved the soil's Plasticity Index (PI). Only 8% addition had a Maximum Dry Density (MDD) of 1770 kg/m3 meeting the AASHTO standard. The addition of CCR: RHA improved the soil's strength properties in terms of UCS and CBR. However, the CBR values generally do not meet the FMWH and AASHTO recommendations for subgrade. Erodibility behaviour showed that increasing CCR and RHA content improves soil durability. CCR and RHA have undoubtedly increased soil strength, but not to the desired level. Therefore, further research should be conducted to determine their compatibility with other stabilizers.

Partial Replacement of Conventional Material with Stabilized Soil in Flexible Pavement Design

Due to rapid urbanization and industrialization, the construction of roads increases rapidly for easy and fast transportation. Adequate land is not available everywhere to construct good roads; hence, roads are forcefully built on locally available soil such as loose soil or expansive soil. In this paper, an experimental investigation was carried out on low plastic soil (LPS) to enhance engineering properties by using chemical soil stabilization (fly ash-based geopolymer). The design of flexible pavement thickness was carried out for conventional and stabilized soil material using IITPAVE software as per IRC 37 guidelines. The results show the feasibility of fly ash-based geopolymer significant enhancement of strength were observed in terms of unconfined compressive strength (UCS) for various curing days (0 to 128 days), California bearing ratio (CBR), and Resilient modulus (MR). The microstructural analysis via Scanning Electronic Microscope (SEM) and X-Ray Diffraction Analysis (XRD) was also reveling the formation of geopolymeric gel which leads to the dense matrix to soil mass. The flexible pavement thickness significantly reduces with the application of stabilized low plastic soil.

A Study of Innovative Alkali-Activated Binders for Soil Stabilisation in the Context of Engineering Sustainability and Circular Economy

In the context of sustainability in the civil engineering industry, chemical ground improvement is becoming increasingly used, as a generally more sustainable alternative to replacing and landfilling unsuitable for construction ground. However, traditional soil stabilisers such as Portland cement or lime are not environmentally impact-free; international research effort is thus focusing on the development of innovative cementing agents. This paper presents results from a feasibility study on the development of suitable alkali-activated slag cements for the stabilisation of two soils. A number of alkali-activators were considered, comprising potassium hydroxide, a range of alkali salts, as well as a material retrieved from waste (Paper Sludge Ash, PSA) which contains free lime. Indicative results of an extensive parametric study in terms of unconfined compressive strength (UCS) are shown, followed by results of ongoing oedometer tests to determine soil compressibility and some preliminary tests on selected soil/binder mixes to observe the durability to wetting-drying cycles. Overall, all alkali-activated cement mixes increased the UCS and stiffness of the soil. Carbonates and Na2SiO3 used on their own gave lower strength increases. The highest strengths were achieved from AAC with KOH and Ca(OH)2 from PSA, which showed similar strength gain. The latter material has shown consistently a lot of promise in terms of strength, stiffness and volumetric stability of the soil as well as treatment durability. Ongoing research focuses on further mix optimisation and a comprehensive mechanical and durability property testing supported by material analysis (mineralogical, chemical and microstructural) to gain a better understanding of the complex mechanisms involved.

The Need of Statistical Approach for Optimising Mixture Design of Controlled Low-Strength Materials

The statistical phase method was introduced to achieve optimal mixing controlled low-strength material (CLSM) proportions, utilising statistical studies. There is no well-known explicit formulation for predicting hardened properties (in terms of unconfined compressive strength (UCS)) of CLSM. The proposed approach to optimising CLSM mix design is demonstrated in the most common case where experimental mixing was considered in compliance with the full factorial experimental design involving three variables with two levels (2³) and the Box-Wilson central composite design (CCD) method. Twenty CLSMs with six replicates (one hundred and twenty specimens) were considered in changing the levels of the main factors that affect CLSM compression strength, the water/cementitious ratio (2.53-2.73) and the wastepaper ash (WSA) percentage (50-100%) and cementitious materials content (160-200 kg/m³). The experimental results were used to analyse variance and design a UCS polynomial regression equation for design factors considered in this research. In order to emphasise how to optimise CLSM mixtures with different options, a statistical model was developed.

Effect of polypropylene fiber and nano-zeolite on stabilized soft soil under wet-dry cycles

Nano-zeolite was used in the present study as a substitute for a part of lime and then inclusion polypropylene fiber in stabilized soil matrix to develop the soil stabilization method with lime and to improve the efficiency of this technique. In so doing, specimens of soft soil with 5, 10 and 15% of modifier L (lime), LZ (lime-nano-zeolite) and LZF (lime-nano-zeolite-fiber) were prepared, and were subjected to 1–7 wet-dry cycles. Then, microstructure and macrostructure tests were performed on the specimens. The results of the analyses, indicated that the optimal replacement of lime with nano-zeolite would be 40%, and the optimal amount of polypropylene fibers inclusion would be 1% in the stabilized soil matrix. Major reduction in lime consumption would yield a 40% increase in compressive strength and a 21% improvement in durability. The results also showed that the specimen containing 15%LZF would have excellent durability against environmental conditions and very good performance in terms of unconfined compressive strength (UCS), tensile strength and weight loss. Before and after applying 7 wet-dry cycles, the UCS increased by 39% and 16%, respectively. The results of this study indicate that LZF modifier is a suitable option for lime-based stabilization in areas under wet-dry cycles.

Electrokinetic biocementation of an organic soil

Organic soils are a continuing challenge to civil engineers, as they are subject to settlements, negatively impacting on civil engineering infrastructure. To improve the in situ properties of these, chemical soil stabilisers (e.g. cement or lime) can be commonly used. Although successful in minimising severe damage, these stabilisers may have environmental side-effects (e.g. cement and lime production is linked to 7%–8% of overall CO2 emissions). Therefore, the development of innovative, superior, cost-effective and overall more sustainable soil improvement techniques is a field of ongoing research effort. In this context, this paper studies the electrokinetic (EK) biocementation of a problematic soft organic soil of the UK railway network using indigenous ureolytic bacteria. The paper focuses on aspects relevant for the effective implementation of treatments, namely the effect of degree of saturation of the soil and different ways of treatment implementation. The results in terms of unconfined compressive strength and CaCO3 content, proved the feasibility of EK biocementation using an indigenous microorganism, either premixed with the soil or injected electrokinetically. Higher strength gains were recorded for degrees of saturation in the region of 85%–95%. Strength gains and increased CaCO3 contents compared to the control samples were also noted when treatment duration was halved to one week although strengths increased further by 13–17% after a two-week treatment. Overall, the study gives promise for the applicability of the EK-biocementation technique under existing infrastructure. Further optimisation of the treatment variables and refinement of the implementation details could enhance the efficiency of the process.

Investigation on cement-improved phyllite based on the vertical vibration compaction method.

The vertical vibration compaction method (VVCM), heavy compaction method and static pressure method were used to form phyllite specimens with different degrees of weathering. The influence of cement content, compactness, and compaction method on the mechanical properties of phyllite was studied. The mechanical properties of phyllite was evaluated in terms of unconfined compressive strength (Rc) and modulus of resilience (Ec). Further, test roads were paved along an expressway in China to demonstrate the feasibility of the highly weathered phyllite improvement technology. Results show that unweathered phyllite can be used as subgrade filler. In spite of increasing compactness, phyllite with a higher degree of weathering cannot meet the requirements for subgrade filler. With increasing cement content, Rc and Ec of the improved phyllite increases linearly. Rc and Ec increase by at least 15% and 17%, respectively, for every 1% increase in cement content and by at least 10% and 6%, respectively, for every 1% increase in compactness. The higher the degree of weathering of phyllite, the greater the degree of improvement of its mechanical properties.

Characterization and adsorption performance of waste-based porous open-cell geopolymer with one-pot preparation

Porous geopolymer foams are promising lightweight materials combining strong strength and adsorption properties. A waste-based porous open-cell geopolymer (POG) was synthesized by one-pot method and investigated in terms of unconfined compressive strength (UCS), pore distribution and adsorption ability. This paper investigates the effect of preparation conditions (raw materials and stabilizing/foaming agents proportion, modulus, curing temperature) on the performance of POG. Results indicated that POG was successfully prepared by industrial wastes (blast furnace slag, BFS) and municipal wastes (water treatment residue, WTR). The appropriate range of conditions were determined for the preparation of POG (H2O2 = 1.50 ~ 2.50 wt%, K12 = 1.50 ~ 2.00 wt%, modulus = 1.25 ~ 2.00, and temperature = 60 ~ 70 °C). Under these conditions, the UCS in the range 1.77 ~ 4.77 MPa, and the total porosity in the range 35.19 ~ 69.97 vol%. The extreme environments resulted in the form of instable structure and discontinuous pore structure. The statistical results demonstrated that the total porosity, mean diameter, and max diameter of POG are significantly negative correlated with UCS, and the relationship of total porosity and UCS can be described by Ryshkevith (R2=0.8459) and Schiller model (R2=0.8689). Compared to the geopolymer bulk, POG showed significant adsorption advantage for heavy metal cations and cationic dyes, and the adsorption removal rates of POG for Cd2+, Cu2+, Pb2+, and MB rising to 92.25%, 119.80%, 110.77%, and 163.98%, respectively. The adsorption mechanisms are mainly based on the negative charge of [AlO4]- tetrahedron and cation exchange between heavy cations and Na+ or Ca2+ in internal matrix. This study indicated that the BFS and WTR are feasible solid wastes for the fabrication of POG, which can be applied in the filtration and adsorption fields for contaminants removal.

Stabilization of expansive clay by fibre-reinforced alkali-activated binder: an experimental investigation and prediction modelling

ABSTRACT Expansive black cotton soil (BCS) exhibits low volumetric stability due to moisture imbalance. Traditional binders like lime and cement show a massive impact on environment by releasing greenhouse gases. In the present study, an attempt was made to improve the geomechanical properties of BCS using alkali activated binder (AAB) with polypropylene (PPF) and glass fiber (GF) at different proportions of fly ash and slag. AAB was produced by compounding an alkali activator solution of sodium silicate and sodium hydroxide with aluminosilicate precursors. The influences of varying dosages of fibers in AAB treated BCS showed a significant improvement in strength properties. The results of 0.4% PPF reinforced AAB treated BCS showed higher bonding interaction and tensile resistance. Furthermore, non-linear best-fit equations were proposed to relate experimental test results with model-predicted results in terms of unconfined compressive strength, indirect tensile strength and California Bearing Ratio for fiber-reinforced AAB treated BCS.

Effect of Freeze–Thaw Cycles on Black Cotton Soil Reinforced with Coir and Hemp Fibres in Alkali-Activated Binder

Expansive black cotton soil (BCS) is predominantly impervious and undergoes swelling and shrinkage when exposed to moisture fluctuation. This results in heaving of soil, causing it to lose its mechanical strength. Use of traditional cementitious binders like lime and cement has a significant impact on the environment and contributes almost 7% of the global CO2 emissions. In the present study, an attempt was made to improve the geomechanical properties of BCS using envirosafe alkali-activated binder (AAB) with naturally available coir (CF) and hemp fibres (HF). The coir and hemp fibres were chemically treated to improve their durability. AAB was prepared by blending an alkali activator solution of sodium silicate and sodium hydroxide with class F fly ash at 0.4 water to solid ratio. This study also investigated the effectiveness of coir and hemp fibre reinforced AAB–BCS at different freeze–thaw cycles. The influence of varying dosages of fibres and freeze–thaw cycles in AAB-treated BCS showed a significant improvement in soil tensile strength and durability. The microstructural and geomechanical results of treated fibres showed higher serviceability and tensile resistance compared to the untreated ones. Furthermore, nonlinear regression equations were also proposed to relate experimental test results with model-predicted results in terms of unconfined compressive strength and indirect tensile strength.

Effect of addition of lime on coir fiber admixed BC soil

Expansive soils, having predominantly montmorillonite clay mineral, pose acute construction problems for many civil engineering structures. Admixing lime is popular and cost-effective which is used widely. However, BC soil has inherent low tensile strength but a high compressive strength. Incorporating fiber reinforcement that is capable of absorbing tensile loads or shear stresses will address the problem. In this context, the use of cheaply and abundantly available natural coir fibers as soil reinforcement in the BC soil along with lime is investigated. The effect of lime reaction and associated heat of hydration on coir fiber was investigated in terms of unconfined compressive strength (UCC) of BC soil. XRD and SEM studies on surface characteristics of coir fiber were studied. It was found that, at longer curing periods after addition of lime, plate-like particles are replaced by foil-like membranes and fine filaments due to flocculation–agglomeration of soil particles along with carbonation. XRD confirmed that these fine filaments are foils consisted of calcium silicate hydrate gel that increases strength due to cementation. It was observed that admixing both untreated and treated coir fibers in lime-stabilized BC soil beyond 7 days of curing causes decrease in the UCC due to heat of hydration of lime reaction that seems to affect the fiber characteristics.

Implementation of biocementation for a partially saturated problematic soil of the UK railway network

This paper refers to biocementation of a problematic soil of the UK railway network as a potential stabilisation technique of this soil using indigenous ureolytic bacteria. The soil is peat, a soft foundation soil also subject to oxidation wastage. As the peat is under existing embankments, electrokinetics (EK) is proposed as a promising technique to implement treatments. In the context of unsaturated soils the paper thus focuses on two particular aspects relevant for the implementation of treatments and the stability of this soil, namely: a) the effect of degree of saturation of the peat on the bio-electrokinetic treatment ; b) the soil water retention curve of the soil affecting flow and transport; these are relevant as we focus on understanding and modelling the implementation of treatments through electrokinetics; moreover for the peat it is of importance to understand moisture exchange in the vadose zone and control groundwater table levels (e.g. during electrokinetics) in order to prevent further oxidation. After isolation and screening of indigenous microorgansisms Bacillus licheniformis was selected for further testing. The results in terms of unconfined compressive strength, CaCO3 content, swelling and compression behaviour and water retention proved the feasibility of biocementation using this indigenous microorganism. Ongoing work is assessing the required treated soil characteristics and related required biocementation degree to solve UK rail's peat foundation problems. Upscaling of the techniques towards in situ implementation is also planned in the next stage of the research.

Using Alkali-Activated Cementitious Materials to Solidify High Organic Matter Content Dredged Sludge as Roadbed Material

It is difficult to treat dredged sludge with high organic matter content by solidification. A new solidification of dredged sludge with high organic matter content was developed, using cement, fly ash, slag, and phosphogypsum as a solidifier and strong oxidant KMnO4and GH as additives, to improve the engineering performance of dredged sludge and make it as a roadbed material possible. The properties of the solidified samples were determined in terms of unconfined compressive strength, products of hydration, toxicity characteristics, water stability, freeze-thaw resistance, and volume stability. The microstructure and hydration products of the dredged sludge after solidification were evaluated by X-ray diffraction analysis, scanning electron microscopy, and thermogravimetry-differential scanning calorimetry analysis. Experimental results showed that the strength of the solidified samples has been significantly improved after treatment by strong oxidants. The effect of GH is better than that of KMnO4. Hydration products (ettringite) were well formed. After solidification by using the binders and strong oxidant GH, the samples had sufficient strength and good water stability performance, freeze-thaw resistance performance, and volume stability performance. The leach liquid of the dredged sludge solidified body meets the standard requirements. So, the dredged sludge after solidification can reach the requirement of the roadbed material.