Optimum Mixing Ratio Research Articles

Research on Compressive Tests of Iron Tailing and Cement-Modified Earth Materials from Northwest China

The strength of earth-modified materials is an important mechanical indicator of raw soil building materials. Iron tailings are a rich mineral waste resource with basic properties similar to river sand and can be used as a modified material for raw soil construction. To increase the utilization rate of iron tailings and improve the mechanical properties of earth materials, modification of earth materials were analyzed using iron tailings and cement. Through a single lattice theory design method, 10 different blending ratios of modified earth specimens were designed, with each group comprising six 100 mm cubic specimens. Earth specimens were used as the control group and compression tests carried out under standard curing conditions, with analysis of the failure mode, compressive strength, deformation, and load–displacement curve for each specimen. Also, the reasons for specimen failures were examined, including the influence of strength, dispersion, and implications of load–displacement curves. The optimal mix ratio of modified materials was determined using frequency domain analysis method. The results showed that the load–displacement curves of materials with different material ratios were basically similar and the slope and discreteness of the curves quite different. Increased tailings and cement content improved the compressive strength of earth materials and increased the discreteness of the material. Through frequency analysis, it was obtained that when the content of tailings was 12.1%–19.5%, cement content 13.9%–19.1%, and earth 65.5%–69.9%, there was a 95% of the guaranteed rate of compressive strength of iron tailings and cement-modified earth materials between 6 and 9 MPa. Iron tailings can, thus, be used as the preferred material for modifying earth materials; single lattice theory can be used as the design method for mixing experiments, and frequency domain analysis can be an effective calculation method for optimizing mixing design. Adding cement and iron tailings to modify the raw soil formula can provide reference for the selection of basic materials for raw soil construction.

Study on mechanical properties of new supporting materials for soft rock underground engineering

Foam concrete contains many holes inside, which has the properties of light weight, shock absorption, energy absorption. It is a good energy absorption buffer material. However, it also has the disadvantages of large shrinkage and poor ductility. In this paper, based on the requirements of foam-fiber concrete for buffering and energy absorption in soft rock support, fiber materials were added to foam concrete, and six-factor three-level orthogonal test was carried out. Combined with the analytic hierarchy process, the optimal mix ratio of each component was determined, and a new type of foam-fiber concrete was prepared. The mechanical properties and deformation law of foam-fiber concrete were studied by indoor axial compression test, DIC digital speckle test, triaxial compression test and Brazilian splitting test. The test results show that the new foam-fiber concrete has good strength, tensile and energy absorption capacity. At the same time, in order to evaluate its energy absorption effect as a buffer layer, through comparative tests, the energy absorption and buffering effect of the new foam-fiber concrete in underground engineering is analyzed. The research results provide a good reference for the study of soft rock flexible support.

Thermogravimetric Assessment and Differential Thermal Analysis of Blended Fuels of Coal, Biomass and Oil Sludge

The coupled combustion of biomass and organic solid wastes including oil sludge has attracted much attention. Although the optimal mixing ratio of different coal types and biomass has been extensively studied, little attention has been paid to oil sludge that has undergone co-combustion. In this study, the combustion characteristics of blended fuel for coal, biomass and oil sludge under different mixing ratios are studied via a thermogravimetric test and differential thermal analysis. Kinetic analysis of tri-fuel is performed using the Flynn–Wall–Ozawa (FWO) and Dolye methods. The results show that the bituminous coal combustion process mainly involves the combustion of fixed carbon (236.0–382.0 °C). Wood pellet combustion (383.0–610.0 °C) has two processes involving the combustion of compound carbon and fixed carbon. Blending wood pellets effectively enhances combustion efficiency. Wood pellets from Korla (KOL) have the most obvious effect on reducing the ignition temperature. The blending combustion of bituminous coal (SC), wood pellets from Hutubi (HTB) and oil sludge (OS) have significant synergistic effects. As the OS mixing ratio increases from 10% to 20% with 45% HTB, Ti and Th decrease from 354.9 and 514.3 °C to 269.8 and 452.7 °C, respectively. In addition, f(α) is [−ln(1 − α)]2 for tri-fuel in most mixing ratios when α < 0.5, while f(α) becomes [−ln(1 − α)]3 at α > 0.5. At a high-HTB-level mixing ratio, increasing the OS content causes a decrease in activation energy to 35.87 kJ mol−1. The moderate blending of oil sludge improves the pre-finger factor and the combustion performance.

The regulation of mechanical properties and freeze-thaw properties of concrete hollow block with granite waste

ABSTRACT Owing to the generation of waste during mining and processing, granite stone causes great damage to the environment. In this study, the broken granite waste and the stone powder were used as concrete coarse aggregate and “admixture” to make granite waste concrete hollow blocks, which could meet the requirements of compressive strength, durability and economy. The influence of the water-binder ratio, cement dosage, and powder-slag ratio on the compressive strength and freeze-thaw properties of the block were analyzed. Subsequently, the optimal mix ratio was determined based on range analysis. The effect of granite waste on the compressive strength and durability of the blocks was also analyzed. In addition, the economic effects of the granite waste concrete hollow block were analyzed. The results show that granite waste concrete hollow blocks with a water-binder ratio of 0.55, powder slag ratio of 15%, and cement dosages of 340 kg/m3 and 320 kg/m3 can meet the strength requirements of MU10 grade and the requirements of freeze-thaw properties. The strength and frost resistance of the granite concrete hollow blocks were enhanced because the granite powder filled the aggregate gaps. In addition, the price of granite concrete hollow blocks was reduced by approximately 50%. The small hollow block of granite concrete is environmentally friendly and worth promoting.

Preparation, mechanism, and application of silica fume–steel slag composite cementitious material based on the D-optimal mixture method

Steel slag and silica fume as cementitious materials to replace cement have been subjected to many recent investigations. However, the optimization of the mix ratio of silica fume–steel slag composite cementitious materials has rarely been reported. This study aims to design and optimize a novel composite cementitious material of the steel slag–silica fume–ordinary Portland cement (SSP) using the D-optimal mixture design (DOD) method. A DOD model was developed to determine the optimal mix ratio of SSP. Microscopic tests were conducted to investigate the synergistic effect of SSP. The mechanical properties of SSP-stabilized macadam and stone chips were evaluated using unconfined compressive strength (UCS), water stability, and split strength tests. The results indicate that the optimal content of steel slag in SSP was determined to be 16.238%, and that of silica fume was 1.917%. Silica fume consumes the Ca(OH)2 generated during hydration, and as a filler, it also provides nucleation sites for hydration reactions, promoting the secondary reaction to generate calcium silicate hydrate (C–S–H) gels wrapped around the steel slag particles, optimizing the pore structure and reducing the porosity of SSP. The SSP promoted the development of mechanical strength in the later stages. The greatest growth observed in SSP-stabilized stone chips, from 7 days to 28 days of curing, the UCS, water stability coefficient, and split strength increased by 62.6%, 9.9%, and 71% respectively. A significant correlation was observed between UCS and split strength, with UCS being approximately 9.0 to 9.8 times higher than the split strength. This study contributes to the optimal design of similar solid waste composite materials and provides a reference for the use of silica fume and steel slag in road construction.

Development and Quality Attributes of Paste Sausage Supplemented with Common Squid (Todarodes pacificus) Tailored for the Elderly

Modern consumers, especially the elderly, have a keen interest in healthy food choices. This study was conducted with the objective of developing squid paste sausages that are easily consumable by elderly individuals while also fulfilling their nutritional requirements. Response surface methodology (RSM) was employed to determine the ideal proportions for mixing raw common squid (RCS; 2.9–56.6%, A), isolated soy protein paste (ISPP; 0.3–37.8%, B), and surimi paste (SP; 25.5–64.7%, C) in order to create a common squid paste sausage prototype (CSPSP). The CSPSP underwent a comprehensive evaluation, encompassing its physicochemical, nutritional, and microbiological attributes, as well as consumer preferences, and was compared to Republic of Korea’s standards for senior-friendly foods. The optimal mixing ratios derived through RSM were as follows: RCSF, 38.7%; ISPP, 21.2%; and SP, 40.1%. Consequently, the hardness of CSPSP (CSPSP-A) prepared with these ratios was measured at 27.8 × 1000 N/m2, a remarkable 95.0% reduction compared to CSPSP-N. Moreover, the texture preference for CSPSP-A was rated at 8.5, signifying the highest level of preference. As a result, CSPSP-A earned a second-grade rating, indicating its suitability for safe consumption by elderly individuals with chewing disorders.

Similar Material Proportioning Tests and Mechanical Properties Based on Orthogonal Design.

Shaking table tests serve as an effective method to simulate landslides triggered by seismic activities. These laboratory experiments necessitate the use of materials that mimic those encountered in real-world scenarios. For this investigation, materials analogous to field conditions for the shaking table tests were formulated using quartz sand, barite powder, iron powder, gypsum, rosin, and alcohol. Within the model test compositions, iron powder, barite powder, and quartz sand acted as aggregates; gypsum functioned as an additive, and a solution of rosin and alcohol was employed as a binder. Employing the orthogonal design method, the physical and mechanical parameters of these analogous materials were ascertained through double-sided shear tests, as well as uniaxial compression and splitting tests. Subsequent analyses included extreme difference and regression assessments targeting the determinants influencing the physical and mechanical characteristics of these materials. The ultimate goal was to determine the optimal mixing ratios for the model test materials. The findings revealed that the physical and mechanical properties of analogous materials at varying ratios span a broad spectrum, fulfilling the criteria for distinct rock model experiments. A thorough examination of the factors impacting the physical and mechanical properties of these materials was undertaken, elucidating their respective influences. Based on the relative significance of each determinant on the mechanical attributes of the analogous materials, dominant factors were identified for a multiple regression analysis, from which the regression equations corresponding to the test ratios were derived.

Comparative study on the effect of steel and plastic synthetic fibers on the dynamic compression properties and microstructure of ultra-high-performance concrete (UHPC)

Ultra-high-performance concrete (UHPC) shows great potential in constructing concrete structures subjected to impact and explosive forces. In order to make UHPC structures more ductile and cost-effective, this study used four-volume fractions of plastic synthetic fiber (PSF) instead of conventional steel fibers (SF) to prepare ultra-high-performance hybrid fiber-reinforced concrete (UHP–HFRC) with a total fiber weight of 2%. The dynamic compression properties at four strain rates were also investigated using a split Hopkinson pressure bar (SHPB) test. The results show that the addition of PSF reduces the flowability and compressive strength of UHPC but contributes significantly to the flexural strength of UHPC. UHP-HFRC demonstrates higher integrity under impact loading and significant sensitivity to strain rates. As the strain rate increases, both the dynamic compressive strength and dynamic growth factor of UHP-HFRC increase, with the optimal mixing ratio of PSF and SF being 1:3.Combined with the SEM and nanoindentation test results, it can be found that the bonding ability of PSF to the substrate is stronger, and the interface zone between PSF and the substrate is 10um smaller than that between sf and the substrate. It can be concluded that it is difficult for PSF to fully replace steel fiber in referencing UHPC, while hybrid fibers should be a good choice to produce excellent UHPC composite.

Preparation of biomass composites with high performance and carbon sequestration from waste wood fibers

Forest ecosystems play a significant role in mitigating global warming, primarily because wood is recognized as a crucial natural material for capturing carbon. However, the increasing global demand for wood conflicts with the idea of sustainable carbon capture, emphasizing the importance of recycling waste wood and utilizing it in multiple ways. Despite the potential of wood fibers to strengthen composites, the complexity of their preparation and their natural sugar content limit their applications in recycling waste wood. This study combines the Random Forest and NSGA II algorithms for comprehensive multi-objective optimization, focusing on enhancing the strength, resilience, and carbon capture capabilities of composites. In-depth microstructural analyses, along with elemental mapping, clarify how wood fibers contribute to toughening and resistance to cracking, affirming their vital role in improving the mechanical properties of composites. The study determined the optimal mixing ratio and mechanism of action of NaOH and CH3COOH treatments. The Pareto solution set derived from the algorithm aids intricate multi-objective balance analyses. Notably, discrepancies between experimental and optimized values remain minimal, and were recorded at 1.03%, 0.85%, 1.76%, and 2.31%, respectively, thus reinforcing model precision and trustworthiness. Cementitious wood fiber composites' merits set the stage for sustainable product innovations, transitioning theoretical insights into eco-conscious practical applications.

Effects of calcium sulfate as activator on mechanical properties of PVA fiber reinforced cementitious composites with high-volume fly ash

In order to study the role of calcium sulfate as activator in cementitious composites, mixtures with different calcium sulfate content ratios were designed. On the basis of satisfying the engineering castability, the effects of calcium sulfate on the mechanical properties of PVA-ECC with high-volume fly ash were investigated by uniaxial compression and tensile tests. The microstructure was analyzed by SEM and XRD. The results show that the addition of calcium sulfate has a certain activation effect and can promote the formation of ettringite. The early strength of PVA-ECC with high-volume fly ash was improved, and the tensile strain decreased by less than 0.92%. The fiber failure mode was analyzed according to the material failure mechanism. The “slip-hardening type” makes ECCs work better with PVA fibers, showing obvious strain hardening and multiple cracking characteristics. Based on the theoretical analysis, the evaluation method of obtaining high tensile strain was established, and the optimal mix ratio and calcium sulfate content of PVA-ECC with high-volume fly ash were proposed.

Influences of Evolution of Pore Structures in Tectonic Coal under Acidization on Methane Desorption.

Experiments on corrosion reactions of pulverized coal with monomeric and polymeric (mixed) acid solutions reveal that monomeric acids are listed in a descending order as HF, HCl, and CH3COOH according to their corrosion effects on tectonic coal collected in Faer Coal Mine (Liupanshui City, Guizhou Province, China). In addition, the optimal mixing ratio of mixed acids is 6% HCl + 6% HF + 3% CH3COOH + 2% KCl. The mineral grains filled in pores in coal samples treated with mixed acid solutions are dissolved, so the porosity increases. The volumes of transition pores and mesopores are obviously affected by acidization, and some transition pores are transformed into mesopores and macropores to form dissolved pores. At the same time, inkbottle-shaped pores reduce, while slit pores or open pores increase. The coal samples after acidization show a higher aromatization degree and an increased relative content of oxygen-containing functional groups, with a generally lower hydroxyl content, so the methane (CH4) adsorption capacity of coal declines, which promotes CH4 desorption. The control effect of pore structures after acidization reactions on CH4 desorption was revealed from perspectives of the diffusion coefficient (Kn), adsorption volume (ω), average pore-throat ratio (PT), and average sinuosity (τav). That is, CH4 molecules in tectonic coal after acidization turn from Knudsen diffusion to transitional diffusion, the adsorption volume of CH4 molecules shrinks, the average pore-throat ratio decreases, and the average sinuosity reduces, which promotes CH4 desorption from tectonic coal.

The Hydration Mechanisms of Co-Stabilization Saline Soils by Using Multiple Solid Wastes

In this paper, an approach was employed to fabricate a curing agent using multiple solid wastes. To determine the optimal mixing ratio, orthogonal and compaction tests were initially conducted, followed by a comparative analysis of the excitation effects elicited by sodium silicate and NaOH. Remarkably, sodium silicate demonstrated superior suitability as an activator. The final composition was established as follows: 4% sodium silicate, 26% carbide slag, 25% granulated blast furnace (GBF) slag, 35% coal fly ash, and 10% flue gas desulphurization (FGD) gypsum. Under controlled conditions of 20% of curing agent content, the unconfined compressive strength of the solidified soil at 7 d attained 1.54 MPa, thereby satisfying the rigorous construction requirements for highways across all levels. XRD and SEM-EDS analyses revealed that the principal hydration products in the system consisted of ettringite, Friedel’s salt, and C-S-H gel. These products enveloped the soil particles, with ettringite and Friedel’s salt intermingling and occupying the intricate framework formed by the gel. The synergistic interplay among the components ultimately fostered the development of a coherent soil structure and enhanced overall densification.

Development of a hydrophobic cement mortar with controllable strength: Preparation and micro-mechanism analysis

The widespread utilization of hydrophobic concrete in applications is often hindered by the significant decrease in mechanical properties observed when traditional modifiers are added to cement mortars. To address this issue, the present study introduces a novel hydrophobic additive called modified mica powder (MMAP). This additive has been developed specifically to enhance the water and corrosion resistances of cement mortar. To determine the optimal mix ratio, the effects of modifiers, particle sizes of MAP, and various preparation methods of MMAP were investigated. These parameters were analyzed in relation to the mechanical properties and water absorption characteristics of the MMAP modified cement mortar. As a result of the experiments, it was found that the capillary water absorption of the MMAP modified cement mortars was reduced by 23.5%-64.4% in comparison to that of the unmodified ones. More importantly, the MMAP had no adverse effect on the mechanical properties of the cement mortar, which was superior to that of the MAP addition using conventional methods. furthermore, the microscopic characteristics of both MMAP and MMAP modified cement mortar were examined using techniques such as FTIR, SEM, and EDS. Through these analyses, insights into the hydrophobic mechanism of the MMAP modified cement mortar were obtained, shedding light on the underlying processes and interactions responsible for its enhanced water resistance properties.

Exploring the potential of multiple lignocellulosic biomass as a feedstock for biobutanol production

To improve the cost-effectiveness of biobutanol production, lignocellulosic biomass is used as a cheap and sustainable feedstock. It provides fermentable sugars for microbial fermentation but lacks nitrogen resources and other nutrients. This study investigated the effects of combining multiple types of lignocellulosic biomass with nitrogen-rich wheat bran on ABE fermentation. Depending on the composition and fermentation effects, the optimal mixing ratio of wheat bran added with sugarcane bagasse, corncob and pine was 1:1, 1:4 and 2:3, respectively. The addition of corn steep powder as a nutritional source significantly enhanced sugar consumption and solvent concentration. Integration of pervaporation with ABE fermentation facilitated timely removal of butanol and alleviated product inhibition, resulting in a final total solvents concentration of 14.51 g/L, comparable to fermentation with TYA synthetic medium. This study demonstrates the feasibility of using combined lignocellulosic biomass to reduce feedstock costs and enhance the application of biobutanol production.

Preparation of High-Ductility Cement-Calcined Coal-Gangue-Powder-Composite-Based Rapid Repair Material.

Coal gangue is a kind of solid waste. A high-ductility cement-calcined coal-gangue-powder-composite-based rapid repair material (HD-RRM) was prepared by partially replacing cement with calcined coal gangue powder (CCGP) for achieving high ductility and rapid hardening and conforming to the strength requirements of pavement layers. First, the physical and chemical properties and the reactivity of the CCGP were investigated. Second, HD-RRM material was prepared, and its tensile performance characteristic parameters were investigated. Lastly, the hydration products and microstructure of HD-RRM were characterized through tests (e.g., non-evaporable water content, scanning electron microscopy (SEM), X-ray diffraction (XRD), and comprehensive thermogravimetric analysis and differential scanning calorimetry (TG-DSC)). As indicated by the experimental results, the CCGP with a particle size of 1250 mesh exhibited the maximum potential reactivity. The optimal mixing ratio for HD-RRM in the experiments comprised a water-cement ratio of 0.27, a sand-cement ratio of 0.3, a fiber volume fraction of 2%, a cement content of 70%, a CCGP content of 20%, a fly ash (FA) content of 10%, and a superplasticizer content of 0.1%. Using the abovementioned mix design, the prepared HD-RRM was endowed with a 6 h ultimate elongation of 2.75%, an ultimate tensile strength of 7.58 MPa, a compressive strength of 45.4 MPa, and an average crack width of 125.53 μm, which meets the requirements of repair materials and provides a design method for CCGP resource utilization and asphalt concrete road and bridge deck repair.

Thermal and durability characteristics of optimized green concrete developed using slag powder and pond ash

Due to the vast development in the infrastructure section, the production of cement-based concrete is a major driving source for the increased global warming and extensive deployment of natural resources such as river sand. To reduce and mitigate these adverse effects, industrial by-products can be effectively used either in partial or complete levels to replace conventional materials such as cement, river sand, etc without compromising the strength and durability characteristics of concrete. This research work focuses on the experimental investigation of the thermal properties, strength, durability and microstructure analysis of optimized green concrete with pond ash and ground granulated blast-furnace slag (GGBS). The novelty of the proposed work lies in the investigation of the thermal and durability characteristics of sustainable green concrete with GGBS and pond ash as a partial replacement for cement and fine aggregate respectively. An optimum mix ratio obtained from the material characterization of 16 trail mixes was tested for mechanical properties, durability and thermal characterization. Moreover, the microstructure analysis of the optimized mix was performed using Scanning Electron Microscope (SEM) to overview the chemical constituents, bonding of molecules at the interfacial transition zone (ITZ), the effect of elevated temperature, etc Results from the trail mixes revealed that the replacement of 30% GGBS and 20% pond ash increased the compressive strength by 8% at 28 days of curing when compared to the control mix. In addition, a detailed multilinear regression analysis was performed and a new equation was proposed to determine the compressive strength of concrete with GGBS and pond ash. The predictions obtained from the proposed equation showed a good match with the benchmark experiments.

A Novel Method of Self-Healing Concrete to Improve Durability and Extend the Service Life of Civil Infrastructure

Concrete civil infrastructure often suffers severe damage to its internal structure due to insufficient durability in high and cold complex environments, affecting the service life of the infrastructure. Therefore, a novel method based on nanofillers for self-healing concrete is proposed to optimize the durability mix proportion of high-performance concrete in complex high and cold environments, which improves the strength recovery rate of concrete. Moreover, a concrete durability prediction model based on particle swarm optimization-least squares support vector machine (PSO-LSSVM) and improved NSGA-II (nondominated sorting genetic algorithm II) algorithm was proposed to quickly and accurately determine the optimization scheme of self-healing concrete mix proportion. First, the model employs PSO-LSSVM to achieve highly accurate predictions of relative dynamic elastic modulus and chloride ion permeability coefficient, which are key indicators of the concrete durability. Subsequently, the predicted regression functions for concrete durability are utilized as fitness functions, and the improved NSGA-II algorithm is employed to obtain the optimal mix ratio for durable concrete. Finally, the Pareto frontier solution set is processed using the ideal point method selection approach to determine the optimal concrete mix ratio scheme. To assess the self-healing ability of the proposed concrete, a concrete durability test study is conducted. Experimental research shows that the durability of the proposed self-healing concrete has been significantly improved. The optimized PSO-LSSVM model demonstrates excellent generalization capability. The coefficient of determination between the predicted and actual values in the test dataset is 0.9357, and the root-mean-square error is 0.10267. Building upon this, the enhanced concrete durability prediction model based on the NSGA-II algorithm proves to be highly effective in predicting the optimal concrete mix proportion scheme. The predicted values of chloride ion permeability coefficient and relative dynamic elastic modulus of the proposed model differ from the actual experimental values by 1.29% and 0.59%, significantly better than the other prediction models.

Research on carbon emission reduction of manufactured sand concrete based on compressive strength

In recent years, it has become an inevitable trend to replace natural sand with manufactured sand. Manufactured sand is accompanied by carbon emissions from production to use. This study regarded this process as the process of manufactured sand from “cradle” to “adult”. Based on the case, the energy consumption and carbon emissions of the process were tracked, the carbon emission factors of the manufactured sand and the manufactured gravel were determined, and the carbon emissions of the manufactured sand concrete (MSC) were calculated. On the other hand, the Gaussian distribution function is used to fit the compressive strength change rate and carbon reduction rate of manufactured sand concrete under different stone powder replacement rate and fly ash replacement rate. The fitting accuracy can reach more than 93%. The fitting results show that the fly ash replacement rate is 24.45%, and the stone powder replacement rate is 8.33%. The mix ratio is the optimal mix ratio, and the carbon reduction rate can reach 23.01% and 28.52%, respectively.

Bioelectricity Generation Using a Crosslinked Poly(vinyl alcohol) (PVA) and Chitosan (CS) Ion Exchange Membrane in Microbial Fuel Cell

<p>Microbial fuel cells (MFCs) are a bioelectrochemical system where electrochemically active bacteria convert organic waste into electricity. Poly(vinyl alcohol) (PVA) and chitosan (CS) are polymers that have been studied as potential alternative ion exchange membranes to Nafion for many electrochemical systems. This study examined the optimal mixing ratio of PVA and chitosan CS in a PVA:CS composite membrane for MFC applications. PVA:CS composite membranes with 1:1, 2:1, and 3:1 ratios were synthesized and tested. The water uptake and ion exchange capacity, Fourier transform infrared spectra, and scanning electron microscopy images were analyzed to determine the physicochemical properties of PVA:CS membranes. The prepared membranes were applied to the ion exchange membrane of the MFC system, and their effects on the electrochemical performance were evaluated. These results showed that the composite membrane with a 3:1 (PVA:CS) ratio showed comparable performance to the commercialized Nafion membrane and produced more electricity than the other synthesized membranes. The PVA:CS membrane implemented MFCs produced a maximum power density of 0.026 mW cm<sup>−2</sup> from organic waste with stable performance. Therefore, it can be applied to a cost-effective MFC system.</p>

Research on the Performance of Calcium Carbide Slag–Fly Ash Stabilized Soil

To address the scarcity of lime resources, this study explores the potential of using industrial solid waste, including fly ash (FA) and carbide slag, as replacements for lime or cement in soil stabilization for roadbed construction. The optimal mixing ratio of FA and calcium carbide slag (CCS) was determined using compaction and unconfined compressive tests. The study also examines the relationship between the optimum moisture content and the maximum dry density of the FA and CCS binder, as well as the strength variation trend. The study investigated the optimal mixing ratio of FA–CCS-stabilized soil, and the strength variation trend of FA and carbide slag-stabilized soil under different age and mixing ratios, using tests such as the unconfined compressive energy test, splitting strength test, compressive modulus of resilience test, and California bearing ratio test. Results indicate that the optimal mixing ratio of FA and CCS binder is 1 : 4, the advocated mixing ratio of CCS-stabilized soil is 8 : 92, and the excellent mixing ratio of CCS–FA-stabilized soil is 8 : 32 : 60.