Road Pavement Research Articles

The Systematic Construction of Emergency Medical Security System in Long-Distance Walking Movement on Urban Paved Roads

Objective To explore the scope of building emergency medical security mechanism in urban paved road environment, and to provide reference, sample data and improvement suggestions for building emergency medical security mechanism in such specific environment. Methods The data of rescue personnel deployment, rescue materials allocation, rescue force monitoring, actual rescue situation, emergency plan and relevant regulations setting, training and other aspects of the emergency medical security mechanism in March and April 2023 were collected, and the data were analyzed. Results (1) The hiking distance was 40km and the road conditions were urban paved roads. There were 1150 official trekkers and 65 people were treated medically. (2) The most common symptoms of outdoor hiking included skeletal muscle injury (19.48%), foot skin and soft tissue injury (18.17%), fever (2.61%) and diarrhea (0.61%). (3) In March, 18.36% of the core medical team members and 20.41% of the first aid volunteers who underwent systematic training took up the task of supporting hiking activities. In April, the core medical team personnel who undertook the task of supporting hiking activities accounted for 1.23% of the total number of the security team, and the first aid volunteers who underwent systematic training accounted for 37.04%. (4) According to local conditions, the multi-vehicle rescue and transport mode was adopted, which was combined with the modified commercial rescue vehicle (42.86%) with the on-board emergency medical unit (EMU) and the ordinary ambulance (28.57%). (5) More than 700 pieces of 34 kinds of medical materials and 40 sets of mobile communication equipment, which were put into use after the feasibility study of the expert group and the technical group, guaranteed the competition from the hardware level. Conclusion The construction of emergency medical support mechanism in outdoor walking sports needs to pay attention to environmental characteristics, operation mode of support team, personnel and adaptability training, equipment and deployment of medical support materials, deployment and cooperation of communication and transport capacity, reasonable support plan and other factors. Medical volunteers who have been systematically trained can undertake part of outdoor medical rescue work. Pre-activity training and regular re-training of medical volunteers can ensure the safety of outdoor activities.

Investigation to enhanced Physical and Mechanical Properties of Road Pavement in Asphalt Incorporating Low-Density Waste Plastic Bags

Investigation to enhanced Physical and Mechanical Properties of Road Pavement in Asphalt Incorporating Low-Density Waste Plastic Bags

Road conditions and driving patterns on fuel usage: Lessons from an emerging economy

Given its usage in freight and urban transportation, diesel supply is a major global issue. Diesel dependence and the urgency of the energy transition are normally addressed on the supply side by either expanding oil refineries or evaluating alternative fuels. Here we focus on the demand-side by examining how road pavement conditions and eco-driving practices affect diesel fuel consumption on highways. This can be particularly important in emerging countries, where road pavement is normally not well-managed and conserved. This analysis encompasses six scenarios for Brazil that vary in road conditions, driving cycles, and tire inflation states. Findings show a significant potential for annual diesel savings, reaching 4.52 billion liters, or 16% of fuel efficiency. A financial analysis indicates a positive return by the year 2037. Hence, this study emphasizes the need for a multidimensional approach to reduce fuel consumption and enhance environmental sustainability within the transportation sector of an emerging economy. While infrastructural improvements are crucial, their effectiveness is greatly amplified when paired with efforts in driver education.

Regression Analysis on California Bearing Ratio of Selected Soft Soils in Osun State for Pavement Construction

This paper presents a regression analysis on the California Bearing Ratio (CBR) of selected soft soils in Osun State for pavement construction. The lateritic soil used, obtained along Osogbo-Ikirun road, Osogbo-Ilesha road, and West By-Pass Okebale in Osogbo, Osun State, is labeled as locations P, Q, and R, respectively, for easy identification. Geotechnical tests were carried out in line with British Standard (1990), encompassing parameters such as moisture content, specific gravity, particle size analysis, Atterberg limits, Compaction, and California Bearing Ratio. A correlation relationship between CBR and LL, PL, PI, OMC, and MDD was developed using multiple linear regression analysis. Standard Minitab 13 and Microsoft Excel 2013 software packages were utilized for the analysis. The comparison between experimental and predicted CBR values from the derived model yielded R² values of 1, 1, and 0.9741 for locations P, Q, and R, respectively. The analysis underscores that geotechnical properties, including percentage fines for Osogbo-Ikirun road, optimum moisture content for Osogbo-Ilesha road, and specific gravity for West By-Pass soils, can be employed to reliably predict CBR values. The regression analysis indicates a robust quality control measure for the variables PF, OMC, and SG during field compaction. The inclusion of these variables into a comprehensive quality control and specification framework is recommended to enhance the longevity and durability of road pavements.

The Effect of Fineness Modulus of Fine Aggregate on Concrete Compressive Strength

Concrete is the major material used for most civil engineering constructions like buildings, bridges, culvert, rigid road pavement, dam spillway and so on. Concrete is made from a mixture of cement, fine aggregate (sand), coarse aggregate (granite or gravel), and water. The fineness modulus is one of the physical properties of fine aggregates (sand). The Fineness Modulus (FM) of fine aggregates (sand) is obtained from the grading size distribution test as summation of percentage cumulative retained by series of sieves and divided the sum by 100. The fineness modulus of sand differs for each sand quarry. The purpose of this research is to analyze the effect of fineness modulus of fine aggregate (sand) from three different sand quarries on concrete compressive strength. The sand for the study were taken from three quarries (Ayegun, Akufo and Awotan) in Ibadan, Oyo state, Nigeria. The specimens of concrete used in the form of the cube measuring 150x150x150 mm amounted to 36 specimens. The compressive strength of concrete (fc’) targeted is 21 N/mm2 with W/C ratio 0.5. Concrete mix ratio of 1:2:4 was batched by weight. The results showed that the fineness modulus of sand strongly influence the compressive strength of concrete. The classification of sand type is differentiated based on the results of fineness modulus test on each sand sample. Sand fineness modulus (FM) of Ayegun quarry is 2.64 called medium sand (zone 2). Sand fineness modulus of Akufo quarry is 2.35 called mild sand (zone 3), and, sand fineness modulus of Awotan quarry is 1.57 called fine sand (zone 4). Concrete compressive strength values of Ayegun, Akufo and Awotan quarries sand were 21.3 N/mm2, 22.4 N/mm2, and 20.5 N/mm2, respectively. The value of sand fineness modulus does not affect the increase in the concrete compressive strength. The best classification of fine aggregate to increase concrete compressive strength is mild sand (Akufo quarry) and all the sand samples meet the planned concrete compressive strength of 21 N/mm2.

Infrastructure and Structural Change in Africa

Abstract Past investments in electricity, Internet, and road infrastructure, in isolation and bundled, have contributed to structural transformation and economic development in Africa. Using new data on the expansion of the road, electricity, and Internet networks over the past two decades, the paper shows that having access to both paved roads and electricity has led to a significant reallocation of labor from agricultural to both manufacturing and services. Adding access to fast Internet has had a major impact on structural change, with an even larger impact on reallocating labor away from agriculture. The paper then uses a spatial general-equilibrium model to quantify the impacts of future regional transport investments, bundled with electricity and Internet investments, on economic development in countries in the Horn of Africa and Lake Chad region.

FTIR spectroscopy analysis assessment of reclaimed asphalt at asphalt mixing plants to optimize the recycling

Reclaimed asphalt pavements (RA) usually are fully recyclable in new asphalt mixtures. The properties of the individually aged and possibly modified bitumen in the RA will affect the mix design of the new asphalt mixture. Furthermore, the RA may contain hazardous PAH-contamination resulting from coal tar, which was applied in German road pavements up to the 1980′s. For identifying substances that impair or influence reusability of the RA the Fourier transform infrared spectroscopy (FTIR) method was modified. Within a total measuring time of approx. 20 min, the binder contained in a sample of granulated road construction material can be recovered by means of a rapid extraction and measured by FTIR-ATR. By evaluating the measured absorption spectra, samples which have to be considered as PAH-contaminated (with PAH contents ≥ 25 mg/kg) could be distinguished from non-contaminated reclaimed asphalt. Furthermore, the presence of styrene-butadiene-styrene (SBS) modification as well as viscosity-changing organic additives could be identified.

Sustainable road paving: Enhancing concrete paver blocks with zeolite-enhanced cement

Abstract The present investigation assesses the impact of zeolite-enhanced sustainable cement (ZESC), a product achieved through the blending and grinding of clinker, gypsum, and varying percentages of natural zeolite (6, 10, and 15%). While the existing research has mainly concentrated on substituting ordinary Portland Cement with natural or synthetic zeolite, a critical research gap persists in using this manufactured cement in nontraditional building materials. Addressing this gap, our investigation assesses the durability and mechanical properties of concrete paver blocks manufactured by ZESC, particularly crucial for road paving applications. Comprehensive evaluations of hardened properties were conducted, including compressive strength, splitting tensile strength, abrasion resistance, and water absorption. In addition, the impact of ZESC on the fresh properties of concrete paver blocks was examined. The findings reveal that a 15% N.Z. inclusion in ZESC production results in an optimal mix design, leading to a remarkable increase in compressive strength and splitting tensile strength by 24 and 25%, respectively. It reduces water absorption and abrasion resistance by 80 and 7.8%, respectively, compared to O.P.C. cement concrete paver blocks. It is noteworthy that the addition of natural zeolite to ZESC mixtures led to an increased water demand. Notably, the integration of natural zeolite significantly reduces the environmental impact of cement production, promoting a sustainable shift by minimizing cement clinker. The study employs microstructural analysis, supported by scanning electron microscopic images, revealing a significant reduction in microcracks and enhanced cohesiveness, particularly at the aggregate-cemented paste interface in ZESC mixes.

Geospatial-based decision support system for prioritizing road segments for maintenance and rehabilitation

Given the growing demand for moving goods and people and the escalating number of vehicles on highways, issues related to road safety have become common concerns. Additionally, the aging of the road infrastructure and the intensification of climatic change effects reinforce the problem of road pavement serviceability. However, accessing funds for road maintenance and having the autonomy for pure technical decisions remain significant challenges for transport authorities. Thus, this paper addresses developing a geospatial-based systematic process for prioritizing highway segment candidates for maintenance and rehabilitation. The investigation was designed to facilitate the decision-making process for the state transportation authority to allocate funds over the 20.315 km of major highways in Minas Gerais, Brazil. The method consisted of ranking the highway segments regarding the geographic context to which each segment belongs, as well as the operational characteristics of the highways. The approach meets the United Nations Sustainable Development Goals by considering socio-economic and demographic perspectives along with other traditional engineering characteristics such as the available transport infrastructure, the traffic volume, the highway capacity, the pavement serviceability and the potential for deterioration, the condition of the surface drainage, and weather-related data. Transportation practitioners with expertise in pavement maintenance and rehabilitation and transportation managers contributed to the development by weighting the factors according to the best possible technical judgment regarding prioritizing funds. The GIS-oriented Delphi framework resulted in a priority index. The index allowed the elaboration of a ranking of priorities, which is vital information regarding public policies and the transparent use of public money for road maintenance and rehabilitation within the State of Minas Gerais. The model is robust and outputs geoinformation and tabular data to feed the decision-making process in an organized and transparent manner. Therefore, the core methodology can be easily transferable to other jurisdictions.

Direct and indirect effects of linear non-cultivated habitats on epigaeic macroarthropod assemblages

Non-cultivated habitats are indispensable ecological spaces within agricultural landscapes that support biodiversity and associated ecosystem services on farmland, thereby contributing to sustainable agriculture. The abundance of taxonomic groups within these habitats serves as a reliable indicator of the diversity levels in epigaeic macroarthropod communities, while the functional groups offer insights into the trophic dynamics of macroarthropods. In recent decades, the impact of non-cultivated habitats on biodiversity within agricultural contexts has received increasing attention. However, few studies have focused on the pathways and factors that influence epigaeic macroarthropod assemblages in different non-cultivated habitats. In this study, Changtu County, a typical agricultural county in the Northeastern Black Soil Region of China, was selected as the study area. The functional and taxonomic groups of epigaeic macroarthropod abundance in different non-cultivated habitats were compared. The structural equation model (SEM) was used to evaluate the direct and indirect effects of non-cultivated habitat type, soil nutrients and vegetation structure reflecting major differences in non-cultivated habitat types on epigaeic macroarthropod assemblages. Our results showed that: (1) linear semi-natural non-cultivated habitats around fields can effectively enhance landscape connectivity. Among these habitats, woodlands (WL), grasslands (GL), and ditches (CD) with high herbaceous vegetation density are usually more favorable for biodiversity conservation in agricultural ecosystems. (2) While dirt roads (DR) and paved roads (PR) may affect the mobility and foraging ability of epigaeic macroarthropods, improving herbaceous vegetation structures along road margins (e.g., planting flowering plants, establishing vegetation buffer zones) can effectively enhance field biodiversity. (3) The characteristics of herbaceous vegetation community are the most important factors affecting the functional and taxonomic groups of epigaeic macroarthropods in different non-cultivated habitats, especially the herbaceous vegetation height (PAH) and species abundance (PAB). In addition, for epigaeic macroarthropods taxonomic groups, non-cultivated habitats affect them not only directly through herbaceous vegetation, but also indirectly through soil organic carbon (SOC). Our results emphasize that in the planning of agricultural landscapes, it is feasible to achieve a harmonious synergy between ecosystem stability and agricultural production through strategic allocation and alteration of herbaceous vegetation structure and soil conditions in different types of non-cultivated habitats.

Field experiment on a vegetation-wicking geotextile-reinforced base for a permeable sidewalk

Wicking geotextiles have proven effective in reducing water content in road bases under both saturated and unsaturated conditions, thereby increasing granular base strength and mitigating moisture-related damage to the pavement. Despite their effectiveness in paved roads, the use of wicking geotextiles in permeable road and sidewalk, particularly in areas requiring robust drainage such as sponge cities, is not well explored. In “sponge city” roads, moisture content fluctuations and subsequent damage to the structure often cause concern, and the wicking geotextile’s drainage could be a potential solution. Therefore, this study aims to investigate and quantify the effectiveness of wicking geotextiles in reducing the moisture content and improving the resilient modulus of permeable sidewalk base layers. The moisture contents of unstabilized and one-directional wicking geotextile- and two-directional wicking geotextile-stabilized bases under permeable paving bricks were monitored with an interval of 7–10 days for over a year. An analytical approach to reconstruct daily moisture content in the base layer was proposed based on the simulated rainfall saturation test. This approach further assesses the enhancements in resilient modulus due to the drainage capabilities of wicking geotextiles. The experimental results indicated that the two-directional wicking geotextile outperforms its one-directional counterpart and both wicking geotextiles outperformed the control condition in terms of drainage efficiency. By reconstructing the daily moisture content and utilizing the relative damage model, the two-directional wicking geotextile significantly improved the annual equivalent resilient modulus of the base layer under permeable paving bricks.

Determination of the Residual Life of Rigid Road Pavements of Industrial Enterprises

Еhe main problems of determining the residual life of rigid road pavement structures of industrial enterprises are considered. An analysis of existing methods for determining the durability and residual life of highways of both rigid and non-rigid types of construction on public roads was carried out. As a result of the research carried out on the territory of the enterprise, an algorithm was proposed for calculating the residual life of the highway structure, based on changes in the longitudinal evenness of the pavement, the presence of defects and damages on the surface of the roadway, compaction of asphalt concrete layers, as well as the actual and calculated intensity of traffic flow. The study of auto-road pavement elements was carried out using the “Trassa” mobile road laboratory, and the determination of the physical and mechanical characteristics of the materials was carried out in the laboratory using modern research methods.

Research and development of a new combination of piezo-thermoelectric energy harvester systems from roadways

Due to the problems associated with fossil fuels, scientists and governments are investigating alternative energy sources. In recent decades, there has been an increase in interest in initiatives involving the collection of clean, limitless energy. This paper focuses on two renewable energy harvesting combination technologies: mechanical vibration utilizing piezoelectric technology and thermal sources utilizing thermoelectric technology. Existing scientific literature proposes various techniques for producing and modeling each system individually. This study proposes a novel piezo-thermoelectric pavement model with piezo-thermoelectric coupling. Due to the lack of typical experimentation in the scientific literature, a new laboratory experimental prototype proposes to reproduce artificially and simultaneously heat harvesting on the artificial road surface and mechanical vibration caused by passing vehicles. Testing the laboratory-developed prototype has determined the efficacy of the piezo-thermoelectric coupling electronic model. This study demonstrated that a hybrid piezo-thermoelectric system is more suitable for road pavement applications than a piezo-thermoelectric coupling system. A hybrid combination system can continue to produce energy even if one of the energy sources is unavailable or malfunctioning, whereas a coupling combination system cannot. In laboratory testing, the combined piezo-thermoelectric harvester proposed could generate up to 1.75 μW without optimizing the materials or power generation. This innovative study demonstrates the feasibility and applicability of combining thermoelectric and piezoelectric technology to harvest energy from road surfaces.

Identification of Hybrid Polymer Material STERED and Basic Material Properties Used in Road Substructures or Pavements.

Modern road construction uses a large number of polymer-based materials. Material composition depends on their roles. Among the most important functions of road body materials is to transfer all loads safely to the subgrade. A thorough understanding of material properties in various climates is crucial for this purpose. In the automotive industry, polymer residues from recycling can be used to make innovative materials, such as STERED, a hybrid polymer composite. Drawing on the porous nature of this material, this paper investigates its mechanical behavior. For road construction, the compressive properties of the material are most important. The paper presents the results of a detailed analysis and experimental research of the STERED material from in-lab tests. Successful research will lead to the inclusion of the material in road body compositions with excellent retention properties, vibration damping, and potential in circular economy.

ROAD DAMAGE EVALUATION ON RIGID PAVEMENT WITH PAVEMENT CONDITION INDEX METHOD IN KLAKAH REJO-BENOWO ROAD, SURABAYA CITY, EAST JAVA

The research objective was to analyze the level and type of damage from every kind of damage on the Klakah Rejo Benowo road by calculating the rigid pavement condition index value and providing solutions. This study took the location of the Klakah Rejo-Benowo road section, Surabaya City—data analysis by calculating the Deduct Value, m, TDV, CDV, and PCI. The research results state it was concluded that five types of damage occurred in Jalan Klakah Rejo-Benowo, Surabaya City. The types of damage are Grooves, Patches, Alligator Cracks, Weathering and Loose Granules, and Pits. Damage caused by high rainfall conditions (> 900mm/year) & Daily Traffic Volume exceeds the provisions of the Binamarga. After analysis, it shows that the road pavement is in Moderate/Fair condition; field analysis results and values calculated using the PCI (Pavement Index Condition) method for damaged road conditions can provide recommendations for road repairs using the Asphalt Institute MS-17 method, namely patching and resurfacing. Based on the analysis of the road condition values obtained, the solution must be patched and re-coated so that water does not quickly seep into the road layer, which causes more severe road damage.

Effect of variations in concrete quality on the crack width in rigid pavement

Cracks pose a significant issue in rigid pavement, leading to substantial damage. The manual mixing and casting of road pavement concrete underscore the importance of concrete quality as a critical parameter. This study investigates crack behavior by varying concrete quality. Loading is performed statically using line loads, shedding light on the impact of concrete quality on crack development. The concrete to be used has a quality fc' of 15 MPa, 25 MPa, and 35 MPa. The fine aggregate used in this study was Lumajang black sand, while the coarse aggregate used was machine crushed stone, and Portland Composite Cement (PCC) was used in all concrete mixes. The reinforcing steel used had a quality fy of 480 MPa, with a reinforcement ratio of ρ=0.010, which was converted to 5-D16 reinforcement. The subgrade density used to support the specimens had a CBR value of 10 %. Specimen dimensions were 2×0.6×0.2 m for length, width, and thickness. Pavement plates, 30 cm thick, were placed on leveled subgrade soil in a steel box set to achieve a 6 % CBR reading. Hydraulic jacks, monitored by a load cell, applied monotonic static loading with 2 kN intervals, reaching a maximum load of 200 kN. Steel tension and plate settlement were measured using a tension sensor and Linear Variable Differential Transformer (LVDT), respectively. A data logger recorded readings, and crack widths were captured by a digital microscope with 0.01 mm accuracy. Experimental results show that low concrete compressive strength values result in larger crack widths, and vice versa. Cracks also occur at earlier loading of concrete quality fc' 15 MPa. In addition, experiments show that the reinforcement stress value has a significant influence on crack width in specimens with low concrete quality

Compaction and strength characteristics of lead contaminated lateritic soil treated with eco-friendly biopolymer for use as road foundation material

Reuse of unwanted soil material due to contamination is one of the available alternative to mitigate the depletion of natural construction material like lateritic soil. Lateritic soil can become contaminated as a result of mining activities. However, assessment of such soil for adequate compaction and strength development is a critical requirement for establishing foundation for road pavement failure of which can result in rapid deterioration of structural integrity of pavement. The research paper investigated the efficacy of Gum Arabic biopolymer (GAB) as eco-friendly additive, in enhancing strength development of lead-contaminated lateritic soil (LCLS) for use as foundation material for road pavement. Varying contents of GAB up to 25% of the dry weight of soil in 5% succession was used in treating LCLS. Compaction characteristics, Maximum Dry Density (MDD) and Optimal Moisture Content (OMC), and California Bearing Ratio (CBR) with microstructural analysis of the treated soil were assessed using three distinct compactive efforts: British Standard Light (BSL), West African Standard (WAS), and British Standard Heavy (BSH). With increase in GAB content, there is a corresponding rise in MDD, while OMC decreased across all three compaction efforts. Optimal CBR values were obtained at 10% GAB content across the three compactive efforts. The Scanning Electron Microscopic (SEM) analysis revealed modifications in the surface morphology occurring at the peripheries of clay particles. The R-squared (R2) values of the regression models derived from statistical analysis of all dependent variables revealed that GAB, MDD, OMC and CE (compactive effort) collectively exert considerable significant effect over CBR values. However, the ultimate strength values fall short of the recommended thresholds for sub-base stabilization. This suggests that a GAB content of 10% enhances the characteristics of contaminated lateritic soil. However, it should not be employed as a sole stabilizer; instead, it could be considered as a potential admixture in cement stabilization.

Conserving existing road pavements against aging: A new assessment method and evaluation of different techniques

Asphalt pavement is an important type of transport asset. Driven by traffic loading and aging-induced material deterioration, asphalt pavements are in bad condition in many places. Severely degraded pavements are often demolished and sometimes recycled. Alternatively, preventive maintenance can be applied to conserve the asphalt pavements. This would result in savings on costs, energy, resources and help mitigate negative environmental impacts. However, effective methods to evaluate the anti-aging performance of the preventative maintenance techniques are currently lacking. This study evaluated the feasibility of using the oxygen diffusion coefficient (Ds) of asphalt mixtures to quantitatively assess the oxygen-retarding efficiency of preventive maintenance techniques by examining the relationship between Ds and aging in surface-treated asphalt mixtures. Ds is found to be a very useful indicator to quantitatively represent the anti-aging performance of the preventive maintenance techniques. It is recommended to be used in future asphalt pavement conservation practices.

Evaluation of Subgrade Resilient Modulus using CBR Test Data to Facilitate Mechanistic-Empirical Pavement Design (MEPD)

Sri Lankan road pavement design has relied on empirical design guidelines, and it is now transforming to a more modern approach known as the Mechanistic-Empirical Pavement Design (MEPD) method, aligning with global best practices. One crucial input parameter in this new methodology is the Resilient Modulus (RM) of unbound materials. Determination of RM and establishment of typical values is essential to implement the MEPD. This study has devoted significant attention to the RM evaluation process and developing predictive models for determiningRM from CBR values. Furthermore, typical RMvalues for locally available soil types have been established. In addition to that, ageospatial database has been established with information on soil properties and RMvalues throughout Sri Lanka. This database is a valuable resource for M-E road pavement design, providing quick reference data to conceptual designs and Level 3-MEPD.

Characteristics of artificial coarse aggregate from High Density Polyethylene (HDPE) plastic waste for highway flexible pavement

Aggregates are a major component of hot mix asphalt and make up about 85% of the total mix volume. The increasing expansion of road infrastructure in Indonesia has led to a depletion of aggregate resources. Conversely, Indonesia is one of the largest producers of plastic waste in Southeast Asia. The aim of this study is to evaluate the potential of high density plastics (HDPE) for use as artificial aggregate material in flexible road pavements. The parameters investigated include softening and melting point, penetration and elongation index, gradation value, specific gravity, absorption and abrasion of the aggregates. The investigations into the physical properties of the artificial aggregates revealed a softening point of 265°C and a melting point of 272°C. The penetration index was 0.77% and the elongation index was 0.70%. The classification values passing through the 3/4" sieve were 100%, 66.88% for the 1/2" sieve and 25.96% for the 3/8" sieve. The specific gravity of the artificial coarse aggregate was 1.629. The absorption of the artificial coarse aggregate was 1.270% and the abrasion value was 0.15%. In summary, the artificial coarse aggregates produced from HDPE plastic waste can serve as a partial substitute for natural coarse aggregates.