This paper investigates the effects of basalt fiber content, length and asphalt-aggregate ratio on the volumetric and strength properties of styrene-butadiene-styrene (SBS)-modified asphalt mixture reinforced with eco-friendly basalt fiber. An experimental scheme was designed to optimize three preparation parameters for the Marshall test indices based on response surface methodology (RSM). The results showed that basalt fiber content presents a more significant effect on air voids, voids in mineral aggregates and voids filled with asphalt. Basalt fiber length is more related to Marshall stability, and flow value exhibits a significant variation trend with asphalt-aggregate ratio. The optimization of preparation parameters is determined as follows: basalt fiber content is 0.34%, length is 6 mm, asphalt-aggregate ratio is 6.57%, which possesses favorable and reliable accuracy compared with experimental results. Furthermore, basalt fiber reinforced asphalt binder and mixture were also studied, and it was found that basalt fiber can enhance the performance of asphalt binder and mixture in terms of cone penetration, softening point, force ductility, as well as pavement performance tests.

https://www.mdpi.com/1996-1944/11/8/1311/pdf

Design Optimization of SBS-Modified Asphalt Mixture Reinforced with Eco-Friendly Basalt Fiber Based on Response Surface Methodology.

Efficiency of basalt fiber length and content on mechanical and microstructural properties of hybrid fiber concrete

The objectives of this study are to examine the rheological and mechanical property of fresh CTB incorporating silica fume (SF) at low temperature and in an effort to assess the applicability of using SF as a partial cement replacement. The cement replacement level was set at 0% (control), 2.5%, 5.0% and 10.0% by weight. Furthermore, the effect of curing temperature (−12, −1, 6, and 20 °C) on time-dependent rheological behavior of fresh CTB within 240 min was also examined and analyzed. The results indicate that the time-dependent rheological behavior of fresh CTB is significantly affected by curing age and silica fume replacement. Both the yield stress and viscosity increase steadily as curing time elapses, and the CTB sample cured of 20 °C has the highest yield stress and viscosity, while that cured of −1 °C presents the lowest values for all the curing periods. However, the CTB samples cured of −12 °C show a slight decrease in viscosity and yield stress until 40 min, then follow by an instant increase due to water frozen. In addition, the yield stress of fresh CTB is elevated by mixing of silica fume, but the viscosity decreases. The uniaxial compressive strength of CTB at low temperature (−1 °C) is enhanced with increasing of silica fume, and the CTB samples with 5.0% silica fume replacement for cement exhibit the highest compressive strength among all CTB mixtures regardless of curing age. The CTB samples with 5% silica fume present refiner pore structure than that with 0% and 10.0% replacement.

Time-dependent rheological and mechanical properties of silica fume modified cemented tailings backfill in low temperature environment

Alternative materials for wearing course of concrete pavements: A critical review

Experimental investigation on dynamic response of asphalt pavement using SmartRock sensor under vibrating compaction loading

The main distresses of asphalt pavements in seasonally frozen regions are due to the effects of water action, freeze-thaw cycles, and so on. Basalt fiber, as an eco-friendly mineral fiber with high mechanical performance, has been adopted to reinforce asphalt mixture in order to improve its mechanical properties. This study investigated the freeze-thaw damage characteristics of asphalt mixtures reinforced with eco-friendly basalt fiber by volume and mechanical properties—air voids, splitting tensile strength, and indirect tensile stiffness modulus tests. Test results indicated that asphalt mixtures reinforced with eco-friendly basalt fiber had better mechanical properties (i.e., splitting tensile strength and indirect tensile stiffness modulus) before and after freeze-thaw cycles. Furthermore, this study developed logistic damage models of asphalt mixtures in terms of the damage characteristics, and found that adding basalt fiber could significantly reduce the damage degree by about 25%, and slow down the damage grow rate by about 45% compared with control group without basalt fiber. Moreover, multi-variable grey models (GM) (1,N) were established for modelling the damage characteristics of asphalt mixtures under the effect of freeze-thaw cycles. GM (1,3) was proven as an effective prediction model to perform better in prediction accuracy compared to GM (1,2).

Further Investigation on Damage Model of Eco-Friendly Basalt Fiber Modified Asphalt Mixture under Freeze-Thaw Cycles

This study proposed an asphalt mixture modified by basalt fiber and diatomite. Performance of diatomite modified asphalt mixture (DAM), basalt fiber modified asphalt mixture (BFAM), diatomite and basalt fiber compound modified asphalt mixture (DBFAM), and control asphalt mixture (AM) were investigated by experimental methods. The wheel tracking test, low-temperature indirect tensile test, moisture susceptibility test, fatigue test and freeze⁻thaw cycles test of four kinds of asphalt mixtures were carried out. The results show that the addition of basalt fiber and diatomite can improve the pavement performance. Diatomite has a significant effect on the high temperature stability, moisture susceptibility and resistance to moisture and frost damage under freeze⁻thaw cycles of asphalt mixture. Basalt fiber has a significant effect on low-temperature cracking resistance of asphalt mixture. Composed modified asphalt mixture has obvious advantages on performance compared to the control asphalt mixture. It will provide a reference for the design of asphalt mixture in seasonal frozen regions.

https://www.mdpi.com/1996-1944/11/12/2400/pdf

Laboratory Evaluation on Performance of Eco-Friendly Basalt Fiber and Diatomite Compound Modified Asphalt Mixture.

The main distresses of asphalt pavements in seasonal frozen regions are due to the effects of water action, freeze-thaw cycles, traffic, and so on. Fibers are usually used to reinforce asphalt mixtures, in order to improve its mechanical properties. Basalt fiber is an eco-friendly mineral fiber with high mechanical performance, low water absorption, and an appropriate temperature range. This paper aims to address the freeze-thaw damage characteristics of asphalt mixtures (AC-13) reinforced with eco-friendly basalt fiber, with a length of 6 mm. Based on the Marshall design method and ordinary pavement performances, including rutting resistance, anti-cracking, and moisture stability, the optimum asphalt and basalt fiber contents were determined. Test results indicated that the pavement performances of asphalt mixture exhibited a trend of first increasing and then deceasing, with the basalt fiber content. Subsequently, asphalt mixtures with a basalt fiber content of 0.4% were prepared for further freeze-thaw tests. Through the comparative analysis of air voids, splitting strength, and indirect tensile stiffness modulus, it could be found that the performances of asphalt mixtures gradually declined with freeze-thaw cycles and basalt fiber had positive effects on the freeze-thaw resistance. This paper can be used as a reference for further investigation on the freeze-thaw damage model of asphalt mixtures with basalt fiber.

https://www.mdpi.com/1996-1944/11/12/2488/pdf

Comparative Study on the Damage Characteristics of Asphalt Mixtures Reinforced with an Eco-Friendly Basalt Fiber under Freeze-thaw Cycles

The objective of this study was to use two kinds of waste oil shale ash (OSA) as partial replacements of conventional mineral filler for evaluating high- and low-temperature performances of asphalt mastics. First, asphalt mastics with conventional mineral filler replacement by OSA (OSA/MF) of 0, 10, 15, 30% by volume based on filler–asphalt (F/A) ratios of 0.8, 1.1, 1.4 were prepared. Then, based on the measured penetration, softening point and ductility of modified asphalt mastics, the overall desirability analysis was adopted to determine the optimal OSA/MF. Subsequently, the high-temperature and low-temperature properties of asphalt mastics with the optimal OSA/MF were studied through dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. Results indicated that OSA could improve the high-temperature stability but reduces the temperature susceptibility of asphalt mastics, whereas the asphalt consistency is influenced insignificantly. Besides, the high- and low-temperature properties of asphalt mastics could be improved by the addition of OSA and the oil shale semi-coke (OSSC) modified asphalt mastic is slightly better than oil shale fly ash (OSFA) modified asphalt mastic in some aspects. Based on these results, the optimum F/A ratios could be obtained to enhance the high-temperature and low-temperature properties of asphalt mastics.

Wensheng Wang

Papers

Design Optimization of SBS-Modified Asphalt Mixture Reinforced with Eco-Friendly Basalt Fiber Based on Response Surface Methodology.

Further Investigation on Damage Model of Eco-Friendly Basalt Fiber Modified Asphalt Mixture under Freeze-Thaw Cycles

Laboratory Evaluation on Performance of Eco-Friendly Basalt Fiber and Diatomite Compound Modified Asphalt Mixture.

Comparative Study on the Damage Characteristics of Asphalt Mixtures Reinforced with an Eco-Friendly Basalt Fiber under Freeze-thaw Cycles

Laboratory investigation on high- and low-temperature performances of asphalt mastics modified by waste oil shale ash