Abstract:In this study, cement mortars with different strengths are poured into the large void matrix asphalt macadam material as a semiflexible pavement (SFP) material and the experimental research is carried out. The current research on SFP is mainly focused on the performance of grouting materials and the influence of grouting matrix materials on the overall mechanical properties of SFP and road performance. However, there are some flaws in the study of the influence of grouting material strength on the performance … Show more
“…Bituminous materials such as asphalt make a large part of materials used in construction, and there are already many published results related to the utilization of industrial waste as filler in bituminous materials. − Also, there are several research articles which point out that some industrial wastes and byproducts could be utilized in the production of stone mastic asphalt. − Some research reports have presented the investigation results of potential waste materials as substitute for the filler from the asphalt mixtures including fly ash and slag, recycled concrete powder, cement kiln dust, waste glass, brick powder, rice husk ash, coal waste powder, oil shale, waste bleaching clay, paper industry wastes, recycled waste lime, phosphate waste filler, municipal solid waste incineration ash, baghouse fines, oil shale fly ash, waste ceramic materials, waste marble materials, − and waste tires. , …”
Section: Introductionmentioning
confidence: 99%
“…Besides the large amount in which it is produced, a major problem is in handling stone dust as it poses a major health hazard upon inhalation. A few studies have been done so far regarding its incorporation in construction materials, such as asphalt concrete, − geopolymers, or cement. , …”
A circular economy creates a connection between extraction, manufacturing, and disposal of materials and reduces the pressure on the consumption of natural resources. Thus, there is a need for using materials as long as possible and recycling them back into economy. As an opportunity for circular economy, this study describes the preparation of a new composite material based on waste as an alternative to the bituminous mastic used presently in the construction industry. The new material replaces the commercial filler prepared from nonrenewable resources with a composite based on two industrial wastes (stone dust and waste cooking oil). The simplicity of the preparation method along with environmental and economic advantages encourages in using this modified composite material as an effective replacement in the mastic currently used. Characterization of materials with different contents of the waste composite in terms of their chemical and physical properties and in reaction with bitumen was done by X-ray photoemission spectroscopy (XPS), scanning electron microscopy (SEM)/energy-dispersive X-ray (EDX), Fourier-transform infrared (FTIR), porosity, and surface area measurements. It was observed that stone dust has a higher specific heat capacity than the commercial filler, which may cause the final mastic to heat up more slowly after being exposed to sunlight than the mastic currently used. Selected bituminous mastic compositions were tested at laboratory level and compared to the corresponding standard requirements for commercial products by determining the density, softening point, elastic recovery, and cone penetration. In order to study their compression and dynamic shear response, a dynamic mechanical analyzer (DMA) was used. The results showed that substituting the filler with the waste composite, regardless of the ratio, does not significantly affect the properties of the standard bituminous mastic.
“…Bituminous materials such as asphalt make a large part of materials used in construction, and there are already many published results related to the utilization of industrial waste as filler in bituminous materials. − Also, there are several research articles which point out that some industrial wastes and byproducts could be utilized in the production of stone mastic asphalt. − Some research reports have presented the investigation results of potential waste materials as substitute for the filler from the asphalt mixtures including fly ash and slag, recycled concrete powder, cement kiln dust, waste glass, brick powder, rice husk ash, coal waste powder, oil shale, waste bleaching clay, paper industry wastes, recycled waste lime, phosphate waste filler, municipal solid waste incineration ash, baghouse fines, oil shale fly ash, waste ceramic materials, waste marble materials, − and waste tires. , …”
Section: Introductionmentioning
confidence: 99%
“…Besides the large amount in which it is produced, a major problem is in handling stone dust as it poses a major health hazard upon inhalation. A few studies have been done so far regarding its incorporation in construction materials, such as asphalt concrete, − geopolymers, or cement. , …”
A circular economy creates a connection between extraction, manufacturing, and disposal of materials and reduces the pressure on the consumption of natural resources. Thus, there is a need for using materials as long as possible and recycling them back into economy. As an opportunity for circular economy, this study describes the preparation of a new composite material based on waste as an alternative to the bituminous mastic used presently in the construction industry. The new material replaces the commercial filler prepared from nonrenewable resources with a composite based on two industrial wastes (stone dust and waste cooking oil). The simplicity of the preparation method along with environmental and economic advantages encourages in using this modified composite material as an effective replacement in the mastic currently used. Characterization of materials with different contents of the waste composite in terms of their chemical and physical properties and in reaction with bitumen was done by X-ray photoemission spectroscopy (XPS), scanning electron microscopy (SEM)/energy-dispersive X-ray (EDX), Fourier-transform infrared (FTIR), porosity, and surface area measurements. It was observed that stone dust has a higher specific heat capacity than the commercial filler, which may cause the final mastic to heat up more slowly after being exposed to sunlight than the mastic currently used. Selected bituminous mastic compositions were tested at laboratory level and compared to the corresponding standard requirements for commercial products by determining the density, softening point, elastic recovery, and cone penetration. In order to study their compression and dynamic shear response, a dynamic mechanical analyzer (DMA) was used. The results showed that substituting the filler with the waste composite, regardless of the ratio, does not significantly affect the properties of the standard bituminous mastic.
Semiflexible pavement (SFP) is considered a composite mixture, as it consists mainly of a porous asphalt mixture with high air voids grouted with highly flowed cementitious grout. Numerous benefits have been attributed to this technology, including exceptional slip resistance, a high static bearing capacity, and rutting resistance. In this study, two different types of semiflexible paving mix were produced by using two different types of grouting materials (GMs). There is a discrepancy between the compressive strengths of the two GMs used, as the compressive strength of the first mixture, which consisted of 96% cement and 4% silica fume (SF), was approximately twice the compressive strength of the second mixture, which consisted of 75% cement and 25% sand. The mechanical and durable properties of the two SFPs were studied, in addition to the effect of variation in the compressive strengths of the two GMs and their effect on the final performance of the pavement. The results of Marshall and rutting tests show that the SFP material exhibits good high-temperature stability. The effect of the variation in the compressive strength of the two mixtures was evident in the results of the tests compared with the sand mixture at a strength of 20.8 MPa, the SF at a strength of 48.1 MPa witnessed a 39.54% increase in the Marshall stability at 28-day curing age. Also, the composite material (CM) showed better rutting performance than traditional asphalt mixtures, which did not exceed 2 mm. The results of the indirect tensile strength (ITS) test showed a discrepancy between the two types of CM, as the ITS value of the grouting material of SF (GMSF) mixture increased by 14.91% compared with the grouting material of sand (GMSN) for the curing age of 28 days for unconditioned samples and by 20.22% for the conditioned samples for the same curing age, while the durability of two types of CM was measured by Cantabro abrasion loss and tensile strength ratio. The results were acceptable and within the specification limits. With a variation for the two types of CM, the GMSF mixture showed an increase in the value of Cantabro loss by 11.52% over the GMSN mixture for ageing samples and 6.59% for non-aging samples of 28 days of curing age.
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