Scholarlink

<p>This experimental research determines the viability of using carbon-sulfur industrial waste (blowdown) as a partial replacement of ordinary Portland cement (OPC) in cold asphalt emulsion mixtures, both to deal with the issue of waste management and to develop sustainable pavement materials. The engineering performance and microstructure were studied of mixtures with a varying degree of substitution of the blowdown systematically using an optimum asphalt emulsion content (OAEC = 7%). Findings indicate that progressive increases in OPC lead to a Ca- and Si-rich hydrate network (C-S-H/portlandite) and denser packing, which gives large increases in load capacity: Marshall stability increased to 20.06 kN, Marshall flow decreased by about 34.9% (5.33 → 3.47&#xa0;mm), ITS at 25&#xa0;°C increased to 530.7&#xa0;kPa (ITS60: 97.7 → 395.7&#xa0;kPa), and compressive strength measurements. Moisture susceptibility results were not monotonic: the tensile strength ratio (TSR) increased steadily with moderate OPC content (12CB mix containing 12&#xa0;g OPC + 60&#xa0;g blowdown reached 92%) but decreased below the typical 80% reference threshold for high OPC mixes (60CB mix containing 60&#xa0;g OPC + 12&#xa0;g blowdown dropped to 72%). Similarly, the index of retained strength (IRS) showed non-monotonic behavior. These findings indicate that strength ratio indices should be interpreted alongside absolute strength values. All in all, low to moderate replacement (large percentage of OPC) is the most suitable compromise between mechanical performance and longevity; complete replacement cannot be used in structural surfacing.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Performance and Microstructural Evaluation of Cold Asphalt Emulsion Mixtures Containing Carbon-Sulfur Waste as Substitute Filler

  • 期刊论文

  • 发表日期：

    2026年2月8日

查看全文
  • Badr A. Yaseen,
  • A. I. Al-Hadidy

摘要

This experimental research determines the viability of using carbon-sulfur industrial waste (blowdown) as a partial replacement of ordinary Portland cement (OPC) in cold asphalt emulsion mixtures, both to deal with the issue of waste management and to develop sustainable pavement materials. The engineering performance and microstructure were studied of mixtures with a varying degree of substitution of the blowdown systematically using an optimum asphalt emulsion content (OAEC = 7%). Findings indicate that progressive increases in OPC lead to a Ca- and Si-rich hydrate network (C-S-H/portlandite) and denser packing, which gives large increases in load capacity: Marshall stability increased to 20.06 kN, Marshall flow decreased by about 34.9% (5.33 → 3.47 mm), ITS at 25 °C increased to 530.7 kPa (ITS60: 97.7 → 395.7 kPa), and compressive strength measurements. Moisture susceptibility results were not monotonic: the tensile strength ratio (TSR) increased steadily with moderate OPC content (12CB mix containing 12 g OPC + 60 g blowdown reached 92%) but decreased below the typical 80% reference threshold for high OPC mixes (60CB mix containing 60 g OPC + 12 g blowdown dropped to 72%). Similarly, the index of retained strength (IRS) showed non-monotonic behavior. These findings indicate that strength ratio indices should be interpreted alongside absolute strength values. All in all, low to moderate replacement (large percentage of OPC) is the most suitable compromise between mechanical performance and longevity; complete replacement cannot be used in structural surfacing.