Aggregate Mixture Research Articles

KARAKTERISTIK UJI PROPERTIS DAN CAMPURAN BETON NORMAL

Normal concrete is another building material that is most widely used in the construction industry. Concrete is meant by reinforcing steel (wire, woven wire) in the concrete cross-section to improve tensile and flexural resistance. The concrete section transfers tensile stress to the reinforcing steel section, which has better tensile strength. Polymer materials that are more resistant to rust can also be used as reinforcement materials. Basically, concrete is made from a mixture of aggregates (fine and coarse), cement, water, and additives. In a concrete mix, the fine and coarse aggregates are bound to the cement matrix. The cement reaction between water and minerals in cement produces a strong matrix, holds the aggregate in place and gives the concrete compressive strength properties. In the current industrial era, material selection for a normal concrete feasibility test is quite challenging due to finding quality materials. Through a series of material feasibility tests for normal concrete mixtures, it is hoped that quality control will be in the use of superior materials. This research was conducted at the Laboratory of PT Jaya Beton Indonesia. Based on the properties test data on the aggregate and concrete materials, it can be concluded that the aggregate materials have met the specifications of the Indonesian National Standard and IJASE. So that the material can be used in the normal concrete mix plan stage (job mix formula) regarding the provisions of the grain gradation using the normal concrete manufacturing method listed in SNI 7656 of 2012 concerning Procedures for Making Normal Concrete. From the results of the trial mix of concrete in Table 20, the authors decided to use the concrete quality f'c 30 MPa with consideration of the effects of the compressive strength of the concrete being relatively stable in terms of deviation. Keywords: test aggregate properties, normal concrete aggregates, material characteristics, concrete mix

CALCULATION OF GRADING OF COLD RECYCLED MIXTURES USING NEW AGGREGATES ACCORDING TO THE DESIGNED THICKNESS OF A REHABILITATED LAYER

Technologies of cold recycling of asphalt concrete using various types of binders have been widely implemented in road building industry in Ukraine. Technologies of cold recycling allow to eliminate some types of deformations or destructions and also to enhance bearing capacity of flexible road pavements. If required, process of cold recycling assumes application of new aggregates to achieve standard grading of a recycled mixture. As the standard requirement does not state any restrictions on relative content of new aggregates, these can be applied to achieve the designed thickness of a rehabilitated layer. This article presents a method for calculation of grading of cold recycled mixtures according to the designed thickness of a rehabilitated layer assuming the amount of reclaimed asphalt pavement (RAP) equals to the amount of asphalt concrete in a milled layer. The proposed method is based on calculation of grading of a mixture of new aggregates that should be rather individual for each recycled mixture. The input data for calculation should be obtained from results of a field testing of “old” road pavement construction and also from laboratory investigation of “old” asphalt concrete cores. The article gives also some examples of calculation which are performed on base of mean values of standard grading of recycled mixtures. Nevertheless, the proposed method of calculation could be applied on the base of any values selected within the standard limits. The proposed method assures precise modeling of composition and properties of a recycled mixture and could be implemented when planning projects on rehabilitation of flexible road pavements either by cold in-plant or cold in-place recycling.

Experimental feasibility for the incorporation of solid waste aggregates in masonry hollow blocks

The aim of this study is to investigate the use of three different solid waste materials sawdust, polystyrene, and rubber as waste aggregates for replacement of mineral aggregates in the Lebanese hollow. The experimental work was focused on investigating different types and ratios of wastes aggregates to be used in the hollow blocks for determining their thermal performance and their mechanical behavior. The results proved that the blocks with recycled aggregates were much more thermally efficient than the regular hollow block but less efficient structurally. While the regular block was found to have a thermal resistance of 0.156 m2 K W–1, the recycled aggregates mixture blocks presented thermal resistances varying between 0.152 m2 K W–1 and 0.219 m2 K W–1 for 1.5 L aggregates, between 0.181 m2 K W–1 and 0. 245 m2 K W–1 for 2 L aggregates, and between 0.217 m2 K W–1 and 0. 266 m2 K W–1 for 2.5 L aggregates. On the other hand, the addition of solid waste aggregates was found to reduce the compressive strength load from about 3.2 MPa for the normal block to a range of 1.2 to 2 MPa for the recycled aggregates mixture blocks. Furthermore, the economic analysis proved that the cost of these blocks is very competitive making them a potential innovative and marketable product.

An Experimental Study on Properties of Pre-Coated Aggregates Grouting Asphalt Concrete for Bridge Deck Pavement.

Epoxy asphalt concrete, mortar asphalt concrete and Gussasphalt concrete are commonly used types of deck pavement materials in bridge deck pavement engineering. However, achieving the high-temperature stability and anti-fatigue performance of the deck pavement materials is still challenging. In order to reduce the rutting and cracking risks of the asphalt mixture, this paper proposed pre-coated aggregates grouting asphalt concrete (PGAC) for bridge deck pavement. Laboratory tests were conducted to determine the optimum grouting materials and to evaluate the mechanical performances of the PGAC material. Test results showed that the mechanical properties for PGAC with grouting material of high-viscosity-modified asphalt binder blending with mineral filler were superior to that of GMA-10 used for the Hong Kong-Zhuhai-Macau Bridge deck pavement. Microstructural analysis showed that the PGAC had a more stable skeleton structure compared to other typical aggregate mixtures. This study highlights the performances of the proposed PGAC and sheds light on the deck pavement material improvement of both high-temperature stability and anti-fatigue performance that could be achieved.

Surface controlled synthesis of Cu2FeSnS4 particles for enhanced hydrogen evolution reaction

Cu2FeSnS4 (CFTS) particles are synthesized using different surfactants such as thioglycolic acid (TGA), polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA) via the solution process. The effect of surfactants on crystal structure, morphology, elemental composition, and electrocatalytic properties of CFTS particles are investigated. CFTS particles with a better crystalline phase are obtained in PVP (surfactant), while impurity phases are observed in TGA and PVA (surfactants). The morphology of CFTS is significantly changed when a different surfactant is used in the synthesis process. The mixture of aggregate and porous (1 μm) particles is observed when PVA is used as a surfactant to synthesize CFTS particles. At the same time, highly porous particles having nanosheets and nanoparticles at the surface are obtained in the case of PVP. In the TGA case, spherical particles with 1 μm size are observed. The electrocatalytic ability of all CFTS particles toward hydrogen evolution reactions (HER) is studied in 0.5 M H2SO4 electrolyte. The overpotential of PVP-based CFTS particles is the lowest as ƞ = 421 mV at 10 mA/cm2 compared to the other two samples. CFTS particles synthesized using PVP exhibit enhanced electro-catalytic performance due to higher surface area.

Prenatal exposure to mixtures of endocrine-disrupting chemicals and autism spectrum disorder

BACKGROUND AND AIM: Mixtures methods have the potential to address the unclear relationship between prenatal exposure to endocrine-disrupting chemicals (EDCs) and risk of autism spectrum disorder (ASD). However, mixtures studies in this area are currently sparse. This study examines the relationship of prenatal exposure to a mixture of 25 EDCs, representing 4 classes of persistent pollutants, and ASD. METHODS: We analyzed data from the Early Markers for Autism (EMA) Study, a population-based, case-control study of children born during 2000-2003 in Southern California. Children diagnosed with ASD (n=491) were identified from clinical records of the Department of Developmental Services and were confirmed by expert review. General population (GP) controls (n=373) were randomly sampled from birth certificate files and frequency matched to children with ASD by sex, birth month, and birth year. Eleven polychlorinated biphenyls (PCBs), 6 brominated flame retardants (BFRs), 2 organochlorine pesticides (OCPs), and 6 polyfluoroalkyl substances (PFAS) were detectable in maternal serum samples collected during the second trimester. To examine the relationship between ASD and EDC mixtures, both within each chemical subclass and across all EDCs, we applied two METHODS: weighted quantile sums regression (WQSR) with repeated-holdout validation and Bayesian kernel machine regression (BKMR). RESULTS:In WQSR adjusted for covariates, PCB, PFAS, and BFR mixtures were not associated with ASD when constrained to the positive direction, but BFRs were associated with ASD in the negative direction (aOR: 0.82; 95%CI: 0.71, 0.95 per quartile increase). Results from BKMR were generally consistent with WQSR, with PBDE 153 contributing the most to both BFR mixture models. WQSR and BKMR analyses showed null associations between the aggregate EDC mixture and ASD. BKMR analyses did not indicate interaction between any of the EDC biomarkers. CONCLUSIONS:Results suggest that prenatal exposure to the mixture of these EDCs is not adversely associated with overall ASD risk. KEYWORDS: autism, mixtures, endocrine-disrupting compounds, prenatal

Performance and benefits of tire rubber as substitute aggregates in the construction of concrete dams

ABSTRACT This paper presents the performance and benefits of tyre rubber as substitute aggregates in the construction of concrete dams. The use of tyre rubber aims at minimising the quantities of traditional aggregate materials, and contributes in mitigating the solid waste problem in Lebanon. Full scale experiments and analyses were performed using data of Janna Dam (Lebanon). A first set of simulations related to structural and seismic analysis were carried out for concrete dams using traditional aggregate mixture to define a reference dam design scenario. A second set of simulations were proposed using tyre rubber aggregates to define a second scenario for the construction of the concrete dam. A comparison between the two scenarios shows that the introduction of tyre rubber as aggregates in the concrete mixture for the construction of the dam showed its performance and provides benefits in terms of reduction of traditional aggregates volume and of random disposal of tyre in the nature.

Assembling and optimization of recyclable magnetite cross-linked inulinase aggregates for production of fructose syrups

The utilization of advanced nanoengineered technologies opens up attractive horizons towards sustainable treatment of waste biomass to produce fine chemicals. Production of fructose syrup (FS) in a single step using inulinase is a major achievements of enzyme technology as it eliminates the need for a multi-enzyme system. Functionalization of particles was done by coating chitosan on the surface of the magnetite and further, the chitosan coated magnetic nanoparticle (cMNP) was added to the mixture of cross-linked inulinase aggregates, and the physio-chemical properties of the aggregates were characterized. The immobilized biocatalyst was further utilized for the production of FS. Upon inulin hydrolysis for 4 h at 60 °C, 18.1 g/L of fructose was obtained with immobilized system. The immobilized inulinase was recycled up to 25 cycles and could be separated from the solution in 20 s by an external magnetic field.

BETON BERMUTU DAN RAMAH LINGKUNGAN DENGAN MEMANFAATKAN LIMBAH ABU BAN BEKAS

The need for housing is increasing day by day. This is a factor in the visit to the need for concrete as a housing construction material. The more concrete that is produced, the more cement is needed for the construction. Concrete is a composite material (mixture) of several materials, the main ingredient of which consists of a mixture of cement, fine aggregate, coarse aggregate and water. Utilization of waste tire ash in the concrete mix is one of the alternative uses so that ic can ultimately increase the efficiency of cement savings which takes a long time to increase in high prices. With reference to this, this study uses used waste as a cement additive with a mixture composition of 0%, 3%, 6% and 9%. The test specimens were made using a cylinder with a diameter of 15 cm and a height of 40 cm with 48 specimens produced. The results of the compressive strength test of normal concrete (25.45 MPa), while the concrete with a mixture of 3% used tire ash (28.15 MPa), 6% used tire ash mixture (23.46 MPa) and 9% used tire ash mixture (18.60 MPa). From this research, it can be said that compressive strength of concrete using 3% ash produces the greatest compressive strength of 28.15 MPa.

Experimental Study of Selected Properties of Heavyweight Concrete Based on Analysis of Chemical Composition and Radioactive Elements of its Components

Heavyweight concrete is mostly used for its shielding properties in the nuclear power plants. These properties can already be influenced by the selection of the input materials. In the present study, concrete samples comprised of four-component binders based on CEM I 42.5 R, blast furnace slag, metakaolin and limestone and a mixture of barite and magnetite aggregate, were investigated. Based on Energy Dispersive X-ray Fluorescence, Neutron Activation, and Prompt-Gamma Activation analyses, three concrete designs were prepared and tested. Mechanical, physical (namely cubic compressive strength, bulk density, longitudinal deformation, and dynamic modulus of elasticity) and thermal properties (thermal conductivity coefficient, specific heat capacity, and thermal diffusivity), which should be influenced by the long-term exposure to irradiation were investigated. Presented results confirmed that the prepared samples are heavyweight concrete with bulk density higher than 3400 kg.m-3 with a low level of longitudinal deformation (between 0.265 ‰ and 0.352 ‰). All the prepared samples belong to the C 35/45 concrete strength class.

Meso-cracking characteristics of rubberized cement-stabilized aggregate by discrete element method

As a sustainable solution, embedding rubber inclusions in the semi-rigid pavement base course can ensure the consumption of a large amount of waste tire pollution and improve the mechanical properties of cement-treated base materials. The rubber modification has a potential effect on reducing the possibility of pavement reflective cracks caused by base cracking. This paper aims to investigate the meso-cracking characteristics of rubberized cement-stabilized aggregate (RCSA) mixtures and to quantitatively evaluate the influence of rubber inclusion content and particle size through numerical simulation. The rubber particle size of 0.6–4.75 mm was selected. The virtual RCSA samples were prepared by replacing similar-size aggregates with rubber particles based on the reference mixtures without rubber. Five volumetric replacement contents (20%, 40%, 60%, 80% and 100%) of three gradation ranges (0.6–1.18 mm, 1.18–2.36 mm, and 2.36–4.75 mm) were adopted. An indirect diametric tensile (IDT) simulation test was adopted to obtain the investigated performance of IDT strength, static stiffness, toughness and toughness index. The simulation results show that the incorporation of rubber inclusion has a negative effect on the IDT strength of the RCSA sample. However, material extensibility and post-peak toughness are improved and stiffness is reduced with increasing rubber replacement percentage. The optimal rubber content of the investigated mixtures should be controlled within 80% of the corresponding aggregate gradation volume, which is conducive to controlling the reduction of the overall strength and the play of the extensibility. The strength reduction and ductility improvement of modified concrete are positively correlated with the particle size of rubber inclusion. The modified RCSA mixture with a smaller rubber particle size could ensure a higher IDT strength and extensibility. For the investigated sample, the best comprehensive modification effect can be obtained using the finer rubber substitute with a particle size of 0.6–1.18 mm. The rubber inclusion acts similarly to a cavity defect, which will result in fracture preferring to occur adjacent to the rubber aggregate. Ignoring the adverse effect of strength, the practical implication of rubber incorporation is to improve the ductile behaviour of the RCSA mixture and reduce base cracking. The present numerical simulation methods have the potential to investigate the meso-cracking mechanism of RCSA. It also provides a theoretical guidance for the gradation design of rubberized mixtures.

Macromolecular crowding in solution alters huntingtin interaction and aggregation at interfaces

Huntington’s disease (HD) is a fatal neurodegenerative disease caused by an extended polyglutamine (polyQ) domain within the first exon of the huntingtin protein (htt). PolyQ expansion directly invokes the formation of a heterogenous mixture of toxic htt aggregates, including fibrils and oligomers. While htt is a cytosolic protein, it also associates with numerous membranous surfaces within the cell, leading to altered organelle morphology and dysfunction. Here, the impact of macromolecular crowding on htt aggregation in bulk solution and at solid/liquid or membrane/liquid interfaces was investigated. Dextran, Ficoll, and polyethylene glycol (PEG) were used as crowding agents. In bulk solution, crowding enhanced the heterogeneity of non-fibrillar aggregate species formed in a crowder dependent manner. However, crowding agents interfered with the deposition of htt fibrils on mica, suggesting that a crowded aqueous phase influences the interaction of htt with interfaces. By use of in situ atomic force microcopy (AFM), the aggregation of htt directly at mica and bilayer interfaces was tracked. The predominate aggregates type observed to form at the mica interface was fibrillar, but oligomeric aggregates of various stabilities were also observed. Crowding in the aqueous phase suppressed deposition and formation of htt aggregates on mica. In contrast, the addition of crowders enhanced deposition of htt aggregates onto supported total brain lipid extract (TBLE) bilayers. Different crowding agents led to distinct htt aggregates on supported bilayers with unique morphological impact on bilayer integrity. Collectively, these observations point to the complexity of htt aggregation at interfaces and that crowding in the aqueous phase profoundly influences this process.

Mechanical Properties Evaluation of Concrete with Crumb Rubber Particles used as Fine Aggregate

Crumb rubber is basically tiny rubber particles produced from scrap vehicle tires. This rubber is crumbled into uniform tiny particles with the help of shredders. In the present work, an attempt has been made to utilize rubber particles as a partial substitute of fine aggregates in fabricating cement concretes. Concrete is a mixture of cement, coarse aggregates, fine aggregates and water. Rubber particles of size ranging between 0.297 and 0.250 mm are used as a substitute in the proportion of 5, 10 and 15% by weight to partially replace fine aggregates. Grade 43 Portland cement has been used. Mechanical properties such as compressive, flexural and impact strength are experimentally investigated. Further, dynamic characteristics such as damping ratio and natural frequencies of test samples with different amounts of crumb rubber particles are compared with neat cement concrete samples. Experimental data for different mechanical and dynamic properties are obtained by curing test samples in water for a period of 7, 14, 21 and 28 days respectively. Substitution of crumb rubber particles to partially replace fine aggregates results in reasonable improvement in impact resistance. A decrease in compressive and flexural strength is observed. Further, addition of rubber particles improves the damping property of the samples along with a decrease in natural frequencies.

Analyzing the Strength of Concrete Blocks Reinforced by Half Portion of Coconut Shell

Concrete is the premier construction material around the world and is most widely used in all types of construction works, including infrastructure, low and high-rise buildings, and domestic developments. It is a man-made product, essentially consisting of a mixture of cement, aggregates, water and admixture(s). Inert granular materials such as sand, crushed stone or gravel form the major part of the aggregates. Traditionally aggregates have been readily available at economic prices and of qualities to suit all purposes. But the continued extensive extraction use of aggregates from natural resources has been questioned because of the depletion of quality primary aggregates and greater awareness of environmental protection. In light of this, the non-availability of natural resources to future generations has also been realized. Different alternative waste materials and industrial by products such as fly ash, bottom ash, recycled aggregates, foundry sand, China clay sand, crumb rubber, glass were replaced with natural aggregate and investigated properties of the concretes. Apart from above mentioned waste materials and industrial by products, few studies identified that coconut shells, the agricultural by product can also be used as aggregate in concrete. According to a report, coconut is grown in more than 86 countries worldwide, with a total production of 54 billion nuts per annum. India occupies the premier position in the world with an annual production of 13 billion nuts, followed by Indonesia and the Philippines.

A Study Based upon the Usage Recycled Aggregate to Enhance the Strength Aspects of Conventional Concrete: A Critical Review

Recycled aggregates are those crushed cement concrete or asphalt pavement which comes out from the construction debris which is reused in construction. They are made from the reprocessing of materials which have been used in previous constructions. This paper discusses about the study of properties of recycled aggregates from the sources which has already been published. The results are that 100% replacement of natural aggregate by recycled concrete aggregate effect on chloride ions resistance, it plays negative effects on durability of recycled concrete aggregates, and addition of fiber in recycled aggregate concrete mixture gave more effective in the performance of concrete. On experimental study of recycled aggregate, compressive, flexural and split tensile strength of the recycled aggregate were found to be lower than that of the natural aggregate. Use of recycled aggregate in a new concrete production is still limited. Recommendation of introduction of recycled aggregates standard is required for the materials to be used successfully in future. Gaps in literature reviews are also included in this paper.

Critical State Model of Sand-Tire Derived Aggregate Mixtures Based on Triaxial Tests

This study is part of an environmental experimental program on the use of scrap automobile tires for geotechnical applications. Different types of laboratory tests were conducted to determine the elastic, plastic, and creep parameters of tire derived aggregate (TDA)-sand granulated mixtures. However, this paper emphasizes the plasticity parameters via the development of a critical state model based on the results of triaxial tests. This was attained by considering loose sand specimens, at a predetermined TDA volumetric content, subject to three different confining pressures under a constant axial displacement rate. The calculated deviatoric stress versus axial strain curves, obtained via the modified Cam Clay model, captured the non-linear elastoplastic response obtained in the tests. Results indicated that the level of the shear strength is highly dependent on critical state friction angle which in turn depends on the TDA content. For the loose TDA-sand mixtures used in the present study, the effect of the TDA content demonstrates a reinforcement of the sand matrix. However this reinforcement diminishes as the TDA content increases.

Effect of using dimensional stone waste sourced from Lorestan Province on the performance of high-strength self-compacting concrete

Producing enormous quantities and continuous stockpiling of granite industrial by-product enforced researchers to utilize this waste in a sustainable state in concrete to diminish its adverse impacts on the ecosystem. This study aims to experimentally investigate the possibilities of reusing granite waste sourced from Lorestan Province in fiber-reinforced self-compacting cementitious composite using hooked-end steel fibers. The L-box and U-box tests were performed to assess the fresh properties of mixes, whereas compressive strength, flexural strength, ductility, flexural toughness, and tensile strength tests were conducted for measuring the hardened properties of self-compacting concrete mixes. Results of the fresh properties tests for all of the steel fiber reinforced-recycled aggregate mixtures were found within the satisfactory limit of standard. In other words, the incorporation of granite waste in self-compacting concrete augmented the hardened properties. It should be noted that the effects of simultaneous use of granite waste and steel fiber in improving the tensile strength, flexural performance, ductility, and bending toughness of the specimens are higher than the compressive strength. In specimens without steel fiber, brittle failure occurred immediately after the formation of the first crack. With the increasing percentage of steel fibers in the samples, the ductility increased, and the ductile failure occurred in samples.

Rapid Conversion of Amyloid-Beta 1-40 Oligomers to Mature Fibrils through a Self-Catalytic Bimolecular Process.

The formation of fibrillar aggregates of the amyloid beta peptide (Aβ) in the brain is one of the hallmarks of Alzheimer’s disease (AD). A clear understanding of the different aggregation steps leading to fibrils formation is a keystone in therapeutics discovery. In a recent study, we showed that Aβ40 and Aβ42 form dynamic micellar aggregates above certain critical concentrations, which mediate a fast formation of more stable oligomers, which in the case of Aβ40 are able to evolve towards amyloid fibrils. Here, using different biophysical techniques we investigated the role of different fractions of the Aβ aggregation mixture in the nucleation and fibrillation steps. We show that both processes occur through bimolecular interplay between low molecular weight species (monomer and/or dimer) and larger oligomers. Moreover, we report here a novel self-catalytic mechanism of fibrillation of Aβ40, in which early oligomers generate and deliver low molecular weight amyloid nuclei, which then catalyze the rapid conversion of the oligomers to mature amyloid fibrils. This fibrillation catalytic activity is not present in freshly disaggregated low-molecular weight Aβ40 and is, therefore, a property acquired during the aggregation process. In contrast to Aβ40, we did not observe the same self-catalytic fibrillation in Aβ42 spheroidal oligomers, which could neither be induced to fibrillate by the Aβ40 nuclei. Our results reveal clearly that amyloid fibrillation is a multi-component process, in which dynamic collisions between different interacting species favor the kinetics of amyloid nucleation and growth.

An efficient model for predicting the dynamic performance of fine aggregate matrix

AbstractFine aggregate matrix (FAM) refers to the mixture of asphalt binder and fine aggregate in asphalt mixture. The viscoelastic properties, such as the complex modulus of FAM, directly affect the performance of asphalt pavement. In this study, finite element (FE) simulation by coupling random aggregate distribution algorithm and steady‐state dynamic (SSD) analysis was applied to predict the complex modulus of FAM. Both the dynamic moduli and phase angles of FAM were predicted and compared with those obtained from laboratory tests. The modeling and testing results indicated that the complex interface layer between asphalt mastic and aggregate can significantly affect the viscoelastic performance of FAMs. Considering the interface layer into the FE model can improve the prediction accuracy. Besides, the simulation results showed that the SSD method is 576 times more efficient in predicting the dynamic moduli and phase angles of FAMs than the conventional transient dynamic method, indicating its high potential for multi‐scale modeling of asphalt mixture.

Application of deep learning-based image recognition technology to asphalt–aggregate mixtures: Methodology

An important factor that affects the performance and durability of asphalt–aggregate mixtures is the size distribution of the aggregate particles. However, there are no accurate and quick methods of obtaining this information currently available. A potential solution to this problem is to use computer-aided image recognition technology, a technique that is being used increasingly more often in the field of pavement engineering. In this paper, asphalt core samples drilled from pavements are used as test objects. The information collected from the side surfaces of these cores is analyzed using neural network technology to help improve the speed and accuracy of the quantitative analysis of the asphalt mixtures. First, a camera is used to make a series of photographic images of the side surface and image reconstruction compositing is adopted to produce an image of the asphalt–aggregate mixtures. This image can be processed using a neural network (U-NET++) to identify the aggregate in the image. The training and recognition effect is improved by using Gaussian blur and secondary labeling methods. The grayscale images can then be binarized, filled, and the aggregate particles are segmented in order to identify holes and areas with adhesion problems. The geometric forms of the particles that appear on the side surfaces of the asphalt mixtures can be accurately obtained. Important geometric parameters (e.g. aspect ratio and roundness) can thus be derived from the image. A method of identifying and analyzing segregation and weakness in the asphalt mixture is proposed. The results show that our composite images are more accurate than traditionally-synthesized panoramic images. Also, the trained U-NET++ is ideal for recognizing and segmenting the aggregate image. The data obtained from the image can thus be used to quickly derive index parameters for the asphalt mixture. Compared with traditional test methods, this method only requires the use of mobile phones and personal computers. It is thus a lightweight and intelligent analysis method for acquiring information about asphalt–aggregate mixtures.