Microwave Heating Rate Research Articles

Study on carbon nanotube/shape memory polymer composites and their applications in wireless worm actuator

Abstract In this study, the surface of the carbon nanotubes was modified by chemical functionalization. The carbon nanotubes were placed in a mixed acid solution with a nitric acid-to-sulfuric acid volume ratio of 1:3. The results of the functionalization of the carbon nanotubes were investigated by controlling the reaction time. From the experimental results, the functionalized carbon nanotubes with a reaction time of 12 hours show good dispersibility. In the study of the essential characteristics of composite materials, it was observed that the tensile strength decreased with increase of carbon nanotube content. Compared with the result of the tensile strength test, it can be found that with increasing carbon nanotube content, the microwave heating and shape recovery speed are greatly improved. The experimental results show that the shape memory polymer composite with 4 wt% carbon nanotubes has the fastest microwave heating rate, so it takes only 2 minutes to achieve complete shape recovery. Finally, this study used shape memory polymer composites doped with 4 wt% carbon nanotubes as the driving end, combined with an elastic structure made of polyimide (PI) film using origami techniques to form a worm actuator. In the test, the system could move a distance of 6 mm forward during a microwave time of 1 minute. In addition, this research also constructed a physical model of shape memory polymer and explored the simple movement mechanism of the system.

Hierarchical nanostructured MnF2 fabricated using rapid microwave synthesis as abnormal high-capacity of anode materials for Li-ion batteries

Tailoring various architectures of electrode material has been deemed a feasible route for improving the surface reactivity, the contact area between electrode and electrolyte, and enabling shortened electronic pathways to realize higher performance lithium-ion batteries. Here, we rapidly synthesized the manganese fluoride (MnF2) with various morphologies by microwave irradiation using ionic liquid as the fluoride source, soft template, and microwave absorber solvent. The hierarchical nanostructured MnF2 were optimized by controlling the purity of ionic liquid, microwave heating rate, and precursor concentration. The dominant factors influencing the morphologies of MnF2 were systematically investigated and relevant descriptions for the formation mechanism were suggested. Also, we demonstrated the abnormal high-capacity lithium-ion battery anode using the hierarchical nanostructured MnF2 anode based on the conversion mechanism. The prepared MnF2 anode yielded a maximum reversible specific capacity of 986 mAhg−1 at 0.1C after 30 cycles. This study provides a comprehensive understanding of the morphological control of the hierarchical structured MnF2 using the microwave-ionic liquid combination method for high-capacity lithium-ion battery anode.

Features of technological processing of seeds with an electromagnetic field of microwave before sowing

To increase the efficiency of crop production in the arsenal of the agronomic service there is a number of techniques, methods and technologies that reveal the potential of agricultural plants for all stages of production, starting with soil preparation, selection and preparation of seeds for sowing, agrotechnological measures during the growing season, harvesting technologies, storage and processing of products. The article presents the results of experimental studies on the use of the energy of ultra-high frequency electromagnetic fields for pre-sowing treatment of lupine seeds in order to increase their germination. Revealed the relationship between the parameters of microwave exposure and seed germination. The areas of modes where microwave treatment allows to increase germination, as well as areas of modes in which the impact does not reach the planned effect, or has a negative (depressing) effect, have been determined. Recommendations are given for ensuring the optimal modes of microwave processing and ensuring control of the parameters of the technological process. Based on the results obtained, it can be reliably asserted that the region of microwave treatment of lupine seeds, with a result exceeding the control values, is observed at exposure in the range from 50 to 60 s and at a specific microwave power of exposure from 1.0 to 1.17 kW/kg. The best result of an increase in germination by 1.5% was obtained at 60 s and 1.17 kW/kg. When treating seeds, it is recommended to maintain an average microwave heating rate of 0.50 °C/s until an average microwave heating temperature of 51.5 °C is reached.

Bauxite residue as a catalyst for microwave-assisted pyrolysis of switchgrass to high quality bio-oil and biochar

Bauxite residue (BR) is a highly alkaline type of solid waste generated by the aluminum industry that poses a significant environmental risk upon disposal. However, BR is abundant in metals, especially iron, that offer the desired catalytic activity for microwave pyrolysis. Thus, this study aimed to use BR as a low-cost microwave absorber and catalyst for biomass microwave pyrolysis to obtain higher quality bio-oil and biochar. The addition of BR to switchgrass, the representative biomass, did not facilitate microwave absorption because most of the iron in the BR was in the form of goethite and hematite. However, the addition of an efficient microwave-absorbing catalyst (e.g., K3PO4 or clinoptilolite) to the BR triggered synergistic effects, increasing the microwave heating rate by ~ 346% compared to K3PO4 or clinoptilolite alone, which was attributed to the reduction of hematite and goethite to maghemite and/or magnetite. The addition of 10% BR to a mixture of 10% K3PO4 and 10% bentonite further triggered synergistic effects that resulted in the highest microwave heating rate of 439 °C/min, which was a 211% increase compared to using 10% K3PO4 and 10% bentonite without BR, and doubled the Brunauer-Emmett-Teller (BET) surface area of the biochar, reduced the bio-oil acidity by up to 71% compared to that obtained using a single catalyst, and increased the alkylated phenols contents in the bio-oil by 339% compared to that produced without a catalyst. These results demonstrated that the synergistic effects of BR can only be triggered when mixed with another efficient microwave-absorbing catalyst.

Effect of additive mixture on microwave-assisted catalysis pyrolysis of microalgae

In this paper, the microwave-assisted pyrolysis characteristics of Dunaliella Salina under compound additive (the mixture of graphite and Fe2O3) was studied. Different addition amounts (5% and 10%) and varying mixing ratios (graphite/Fe2O3 = 0:10, 3:7, 4:6, 5:5, 6:4, 7:3, and 10:0) of compound additive were studied by thermogravimetric analysis (TGA). The results revealed that the addition of compound additive increased the microwave heating rate considerably. With the increase of the proportion of graphite, the comprehensive pyrolysis characteristic index (S) increased, while the initial pyrolysis temperature (Ti) and peak temperature (Tp) decreased. When the additive amount was 5%, the G3Fe7 (graphite/Fe2O3 = 3:7) group had synergistic effect on the average weight loss rate (Ra), the maximum heating rate (Hm) and average heating rate (Ha). When 10% compound additive was added, graphite and Fe2O3 (GFe) inhibited all the temperature characteristic parameters. At the same mixing ratio, when the compound additive amount increased from 5% to 10%, Ti and Tp decreased, pyrolysis residue mass (M) increased, and reaction rate at the peak (Rp) showed a downward trend. Kinetic analysis showed that additives could reduce the apparent activation energy (E) of D. salina, and the E of G7Fe3 group with 10% addition amount was lowest (28.26 kJ/mol).

Closed-vessel microwave leaching of valuable metals from spent lithium-ion batteries (LIBs) using dual-function leaching agent: Ascorbic acid

A novel closed-vessel microwave system for leaching of valuable metals from spent LIBs was examined using ascorbic acid. Important parameters and energy requirement were assessed. Leaching efficiency of Li, Co, and Mn and total energy requirement decreased as microwave heating rate increased from 5 °C/min to 90 °C/min. Leaching efficiency increased significantly with increasing acid concentration. Leaching rate of Li, Co, and Mn increased as temperature increased from 75 °C to 125 °C and data fitted well with pseudo second order model. Complete leaching of Li, Co, and Mn from spent LIBs was obtained at 0.5 M of ascorbic acid, 40 °C/min heating rate, 10 g/L of solid to liquid ratio, 125 °C within 10 min. Using 0.1 M of ascorbic acid could induce reduction of Co (III) in spent LIBs Co (II), as evidenced by XPS analysis. Total of 97.66% of Co and 58.99% of Mn in leaching solution were recovered on the addition of oxalic acid. Compared with conventional leaching, the closed-vessel microwave system provides an effective and energy-efficient leaching process since the heat loss is lessened and the high pressure and temperature of ascorbic acid solution intensified leaching reactions.

УСТРОЙСТВО И СПОСОБ УПРАВЛЕНИЯ СВЧ-ОБРАБОТКОЙ СЕМЯН НА КОНВЕЙЕРНОЙ ЛЕНТЕ

The sowing qualities of seeds – such as germination, germination energy, weight of 1000 seeds, etc., are the factors ensuring high yields of agricultural crops. Technological methods of seed and grain treatment with the UHF MEMF (microwave electromagnetic fi eld of ultrahigh frequency) energy involve the use of various types of microwave devices, diff ering both in operating principle and in design. In fact, the process of microwave treatment of seeds is similar to the process of heat treatment of dielectric materials. Therefore, depending on the goal of treatment, microwave devices should provide some kind of selectivity of microwave heating, a high conversion factor of microwave energy into thermal energy, uniformity of microwave treatment of the bulk of material, protection of the microwave generator and electromagnetic safety. During the microwave treatment of seeds, it is important to ensure uniform treatment of the bulk of seeds and automatically maintain optimal treatment modes (microwave heating modes). An installation design is proposed for microwave treatment of seeds. A specifi c feature of the proposed design is that seeds are processed on a moving belt under an emitter with the process control and regulation according to the speed and fi nal heating temperature. Moreover, the microwave source intensity depends on the load (a layer of seeds on the conveyor belt). The authors also propose an algorithm for the microprocessor control of the device. Thus, the proposed design of the installation for treating seeds in a layer under the emitter on a moving conveyor belt, as well as the technological algorithm for matching the microwave source with the load ensure the compliance with the processing modes in strictly specifi ed ranges of the fi nal temperature and microwave heating rate of the material, as well as protect the microwave source from refl ected electromagnetic waves.

A method to derive the dielectric loss factor of minerals from microwave heating rate tests

Characterizing the loss factor of basic rock-forming minerals is fundamental in understanding the mineral-microwave interactions and predicting the possible weakening effect of microwave on rock. This paper proposed a novel method for deriving the loss factor of minerals based on the microwave heating rate tests, the electromagnetic numerical simulations and the effective medium theory. The heating characteristics of 8 basic rock-forming minerals at 500 W were investigated using a 2.45 GHz single-mode microwave and the minerals were classified into 3 categories based on the heating rate in °C/min/g. Meanwhile, the electric field strengths in the minerals were obtained using electromagnetic simulations and the loss factors of the minerals were calculated based on the effective medium theory. The loss factors calculated were then compared with those measured by the resonant cavity perturbation technique. This method provides an alternative to get the loss factor of minerals from the microwave heating rate tests.

Improving microwave healing characteristic of asphalt concrete by using fly ash as a filler

The paper aims to evaluate the usability of fly ash (FA), which is an environmental pollutant, as a filler in asphalt concrete in order to accelerate its microwave heating rate to promote self-healing. In the study, microwave heating rates of asphalt concrete specimens with and without FA were determined via thermographic imaging. Then the three-point bending test was applied to specimens before and after the microwave healing procedure. The crack size of the damaged specimens was also measured via a crack microscope in order to determine the effect of damage levels on microwave healing performance. Test results demonstrated that crack sizes both before and after healing could be interpreted as an indicator of the self-healing performance of the specimen. Microwave heating temperature is the key factor of self-healing, and FA has improved microwave heating rate of asphalt concrete. FA has also improved the healing capability of specimens at some damage levels. It can be concluded that fly ash has great potential as a filler in self-healing asphalt concrete because it can improve self-healing and mechanical characteristics of asphalt concrete, and FA could be reclaimed by using this way.

Microstructural optimization of NH2-MIL-125 membranes with superior H2/CO2 separation performance by innovating metal sources and heating modes

Metal-organic framework (MOF) membranes have received increasing attention due to their unprecedented potential for energy-efficient gas separation. Compared with other MOF materials (like ZIF), fabrication and microstructural manipulation of high-performance Ti-MOF-based membranes, although being very attractive due to their excellent chemical and thermal stability, remained relatively less investigated due to the limitations of available titanium sources and heating modes. In this study, different Ti sources (TPOT, TiS2, and MXene) and heating modes (conventional heating, multi-mode microwave heating, and single-mode microwave heating) were examined for the preparation of NH2-MIL-125 membranes showing diverse microstructures and gas separation performances. The present work revealed that for the first time, MXene, the new two-dimensional Ti carbide, could be used as Ti source for synthesizing MOF membranes. The best performing NH2-MIL-125 membranes, which were obtained with TiS2 as the metal source under single-mode microwave heating, exhibited the highest H2/CO2 selectivity (ca. 17.2) as well as considerable H2 permeance (1.7 × 10−7 mol m−2 s−1 Pa−1), owing to an enhanced non-thermal effect of single-mode microwave heating and balanced dissolution rate of TiS2.

Investigations on the microwave absorption properties and thermal behavior of vanadium slag: Improvement in microwave oxidation roasting for recycling vanadium and chromium

Vanadium slag contains high contents of vanadium and chromium with complex and dense structures, hence microwave heating instead of conventional methods is expected to destroy the dense structure and further to improve the extraction rate of vanadium and chromium, and exploring its dielectric properties is the prerequisite work. Microwave absorption properties and thermal behavior of vanadium slag were investigated. Results indicated that vanadium slag endowed excellent microwave absorption properties, with minimum εr′ value of 34.447 (F/M). Dielectric properties of vanadium slag varied with temperature, which changing trend was matched to the three stages of microwave heating characteristics identified by heating rates. Meanwhile, the changing process of dielectric properties also corresponded to the three processes of thermogravimetric characteristics: dehydration stage (30 °C–280 °C), oxidation decomposition of olivine phase and normal spinel phase (280 °C–650 °C), and oxidation decomposition of vanadium chromium spinel (650 °C–950 °C). Moreover, the maximum dielectric constant and highest microwave heating rate of vanadium slag both appeared at the temperature regime of 500 °C–550 °C, which was also the main temperature regime for oxidation decomposition of olivine phase and normal spinel phase in vanadium slag, demonstrating the appropriate process temperature for microwave heating technology to recycle vanadium slag.

Characteristics of Solid State Sintered Silica Ceramic Derived from Rice Husk Ash

Silica xerogel produced from rice husk ash (RHA) taken from South East Sulawesi Indonesia has been successfully sintered by using a microwave oven 2.45 GHz as well as a millimeter waves (MMW) heating system with a 28 GHz gyrotron. The samples were also heated by using an electric furnace where served as a comparison. Physical characterization of the samples before and after sintering were then investigated by using an Archimedes densification measurement method device, a X-ray diffraction (XRD) and a Scanning Electron Microscopy (SEM), respectively. Effect of microwave energy on the characteristics of silica ceramic after processing were analyzed and compared to conventionally sintered results. The effect of frequency to properties of the silica was also revealed and reported previously in separated paper. In this paper, depedency of microwave power and heating rate to grain growth and density of the ceramic are reported. The results suggested that the microwave power affect to grain growth rate of silica xerogel as well as to their density. In other hand, grain growth is also strongly depend on heating rate during fabrication.

The Effect of SiC Content on Microstructure and Microwave Heating Rate of h-BN/SiC Ceramics Fabricated by Spark Plasma Sintering.

Hexagonal boron nitride/silicon carbide (h-BN/SiC) ceramics were fabricated by a spark plasma sintering (SPS) method. Phase and microstructure of ceramics were characterized and observed, respectively, using the X-ray diffraction, scanning electron microscope and electron probe microanalysis. The effect of molar ratios of SiC to h-BN on the microstructure, relative density, hardness, thermal conductivity, and the heating rate by microwaves on the ceramics were investigated. The results showed that the orientation of flake-like h-BN was significantly influenced by SiC content in h-BN/SiC ceramics. With the increasing of SiC content, the h-BN flakes gradually became an isotropic distribution from the preferred orientation aligning in a SPS pressure direction. The relative density of h-BN/SiC ceramics was 97.6 ± 0.9% at a molar ratio of SiC to h-BN of 40/60 mol%. The preferential orientation of h-BN flakes contributed to a relatively high thermal conductivity along the SPS pressure direction, which was beneficial to increasing the heating rate of h-BN/SiC ceramics in microwave fields.

Microwave-assisted catalytic biomass pyrolysis: Effects of catalyst mixtures

This paper studied the catalytic effects of mixtures of different catalysts (i.e., K3PO4 “KP”, Bentonite “Bento” and Clinoptilolite “Clino”) on biomass catalytic pyrolysis compared to the single catalyst under microwave heating and thermogravimetric analyzer (TGA). Since some catalysts can promote microwave absorption while others show promising catalytic effects, it is possible to use mixtures of catalysts to improve high microwave heating rate and simultaneously catalyze biomass pyrolysis reactions. 10K3PO4/10Bentonite (10 wt.%KP+10 wt.%Bento) catalyst mixture increased the mass loss rate by 85% and 45% at 100 and 25 °C/min, respectively, compared to switchgrass without catalyst. The highest microwave heating rates for torrefaction (110–260 °C) and pyrolysis stages (260–400 °C) were found for the catalyst mixtures, with the highest being achieved by 10KP/10Bento. It was also found that the catalyst mixtures affected the type of coke deposited on catalyst surfaces during pyrolysis, which plays an important role on determining the microwave heating rate under microwave catalytic pyrolysis by affecting the dielectric properties of the bed material and then microwave absorption. Oxygenated-coke deposited on catalyst surfaces reduces the microwave heating rate markedly, while graphitic-coke increases the microwave heating rate considerably. Finally, catalyst combinations improved the catalytic performance significantly and reduced the catalyst loads which in turn will reduce the production cost of bio-oil and biochar from microwave-assisted catalytic pyrolysis.

Investigation on mechanical and microwave heating characteristics of asphalt mastic using activated carbon powder as electro-magnetic absorbing materials

Activated carbon, one of carbon-based materials with developed pore structure and favourable microwave radiation absorption, was added in asphalt to investigate its possibility as microwave heating enhancement in asphalt materials. Effect of activated carbon powder (ACP) on mechanical performance of asphalt mastic was firstly studied. Mechanical tests including multiple stress creep and recovery (MSCR) test, temperature sweep test, time sweep test, and linear amplitude sweep (LAS) test were conducted to evaluate rutting resistance, liner viscosity, and fatigue resistance. Interactions between fillers and asphalt were then observed by scanning electron microscope (SEM). Besides, microwave heating capacity of asphalt mastic with different amount of ACP was investigated to ensure its potential in microwave heating acceleration. Cost of activated carbon powder in asphalt mixture was roughly estimated and compared with other microwave absorbing materials. Results showed that addition of ACP slightly influenced physical properties of mastic, permanent deformation at high temperature of asphalt mastic decreased and creep recovery increased. Increase of complex shear modulus and rutting factor suggested that asphalt was stiffened by adding ACP and rutting resistance was also improved. Fatigue resistance was improved and fatigue life was extended most when ACP replacement was 100% volume fraction of fillers. Wetting surface between ACP and asphalt was smooth with less folds and voids which means it had good contact and interaction with asphalt. Mastic with larger amount of ACP had a quick temperature rise under microwave radiation and heating rate (HR) defined as temperature increment per seconds was applied. It is found that surface temperature increased firstly fast and then slowly when dividing heating process as two stage. Results basically ensured the feasibility of ACP in enhancing mechanical performance and microwave heating capacity of asphalt materials. The extra cost from ACP is relatively lower. Partial substitution of ACP in fillers and reused ACP from pollution treatment factories may further reduce the amount and cost from ACP application.

Energy transformation and dynamic properties of N,N-dimethylformamide aqueous solution under E/M field using NNVE MD simulations

Nonequilibrium NVE (NNVE) molecular dynamics (MD) simulations have been performed to investigated the N,N-dimethylformamide aqueous solution in both the absence and presence of E/M field (E=5×108V/m, the microwave frequency are from 0 to 100GHz). The main target of this work is to explore the energy transformation and dynamic properties of DMF aqueous solution during the microwave heating process. The temperature variation, microwave heating rate and energy distribution have been obtained. The direct coupling of rotational motion, vibration and reorientation have been revealed during the microwave energy distribution, and there are two-thirds microwave energy are stored as the intermolecular energy. The structural characteristics are further obtained from the radial distribution functions, tetrahedral order parameters and hydrogen bond. Compare to the conventional heating, the molecular conformations show significant difference and the structure of aqueous solution is intensely disturbed. The apparent increase of diffusion coefficient discloses that high microwave frequency accelerates the molecules motion.

Microwave sintering behavior of FeCuCo based metallic powder for diamond alloy tool bit

A novel method of microwave pressureless sintering to fabricate FeCuCo based diamond alloy tool bits was proposed. The characteristic of densification, mechanical properties and microstructural development of the microwave-sintered samples were investigated. Compared to the traditional sintering method in resistance furnace in this work, the microwave sintering displayed distinct advantages, including shorter sintering time, lower sintering temperature, more homogeneous element diffusion, more excellent holding force between in diamond and alloyed matrix. The result demonstrated that the designed metallic powders could be quickly heated to 850 °C in microwave field and heating rate for compacted mixed powder could even reach up to 30 °C/min. And also the relative density and hardness of samples were estimated to be 95.14% and 98.5 HRB by microwave sintering at 850 °C. Additionally, the microstructure analysis manifested microscopic texture was more uniform, which indicated that the microwave sintering was beneficial to the decrease of void defect in FeCuCo and diamond sintered compact. The possible microwave sintering mechanism was also discussed. This work will provide novel perspective of the sintering strategy for the metallic matrix superhard material tool field.

The role of tailored biochar in increasing plant growth, and reducing bioavailability, phytotoxicity, and uptake of heavy metals in contaminated soil

Microwave-assisted catalytic pyrolysis was investigated using K3PO4 and clinoptilolite to enhance biochar sorption affinity for heavy metals. The performance of resulting biochar samples was characterized through their effects on plant growth, bioavailability, phytotoxicity, and uptake of heavy metals in a sandy soil contaminated with Pb, Ni, and Co. The produced biochars have high cation-exchange capacity (CEC) and surface area, and rich in plant nutrients, which not only reduced heavy metals (Pb, Ni, and Co), bioavailability and phytotoxicity, but also increased plant growth rate by up to 145%. The effectiveness of biochar in terms of reduced phytotoxicity and plant uptake of heavy metals was further improved by mixing K3PO4 and clinoptilolite with biomass through microwave pyrolysis. This may be due to the predominance of different mechanisms as 10KP/10Clino biochar has the highest micropore surface area (405 m2/g), high concentrations of K (206 g/kg), Ca (26.5 g/kg), Mg (6.2 g/kg) and Fe (11.9 g/kg) for ion-exchange and high phosphorus content (79.8 g/kg) for forming insoluble compounds with heavy metals. The largest wheat shoot length (143 mm) and lowest extracted amounts of Pb (107 mg/kg), Ni (2.4 mg/kg) and Co (63.9 mg/kg) were also obtained by using 10KP/10Clino biochar at 2 wt% load; while the smallest shoot length (68 mm) and highest extracted amounts of heavy metals (Pb 408 mg/kg, Ni 15 mg/kg and Co 148 mg/kg) for the samples treated with biochars were observed for soils mixed with 1 wt% 10Clino biochar. Strong negative correlations were also observed between biochar micropore surface area, CEC and the extracted amounts of heavy metals. Microwave-assisted catalytic pyrolysis of biomass has a great potential for producing biochar with high sorption affinity for heavy metals and rich nutrient contents using properly selected catalysts/additives that can increase microwave heating rate and improve biochar and bio-oil properties.

Dielectric Properties of Biomass/Biochar Mixtures at Microwave Frequencies

Material dielectric properties are important for understanding their response to microwaves. Carbonaceous materials are considered good microwave absorbers and can be mixed with dry biomasses, which are otherwise low-loss materials, to improve the heating efficiency of biomass feedstocks. In this study, dielectric properties of pulverized biomass and biochar mixtures are presented from 0.5 GHz to 20 GHz at room temperature. An open-ended coaxial-line dielectric probe and vector network analyzer were used to measure dielectric constant and dielectric loss factor. Results show a quadratic increase of dielectric constant and dielectric loss with increasing biochar content. In measurements on biochar, a strong dielectric relaxation is observed at 8 GHz as indicated by a peak in dielectric loss factor at that frequency. Biochar is found to be a good microwave absorber and mixtures of biomass and biochar can be utilized to increase microwave heating rates for high temperature microwave processing of biomass feedstocks. These data can be utilized for design, scale-up and simulation of microwave heating processes of biomass, biochar, and their mixtures.

Improving microwave absorption efficiency of asphalt mixture by enriching Fe3O4 on the surface of steel slag particles

In order to improve microwave absorption which would be used for in situ repair of asphalt pavement, Fe3O4 was enriched on the surface of steel slag particles through an activated carbon-reduction method. The surface modified steel slags were then added into asphalt mixture to replace fine aggregates. The results showed that the microwave heating rate of modified steel slag was 84.3 °C/min. That was 34.1 and 65.1% higher than that of the control group of unmodified steel slag and fine basalt aggregate, respectively. Within the microwave frequency band of 2–4 GHz, the real part and imaginary part of the complex permittivity of the modified steel slag asphalt mixture (MSAM) increased by 6.4–12.5 and 4.7–13.7%, respectively, comparing those of the ordinary steel slag asphalt mixture (OSAM) and the ordinary basalt asphalt mixture (OBAM). Meanwhile, the real part and imaginary part of the complex permeability of the MSAM increased by 9.8–31.9% and over 6.2 times, respectively. Besides, the microwave heating rate of the MSAM increased by 44.2 and 82.1%, respectively, comparing those of the OSAM and the OBAM. Simulation indicated that after microwave heating for 15 min, the temperature within the OBAM ranged from 62.23 to 125.48 °C. Moreover, the temperature field distribution of numerical simulation was similar to that of the test results. Since microwave absorption was sharply enhanced in the asphalt pavement, it is expected to promote the microwave heating technology in the asphalt pavement.