Scholarlink

<p>The increasing use of concrete in civil construction projects is a current reality, largely driven by the shortage of skilled labor. Pozzolanic ashes originating from the steel industry represent a promising residue for partial cement replacement. This study investigated the substitution of 30% fly ash from thermoelectric power plants (CVM) in Portland Composite Cement with filler (CPII-F40) for concrete production. It was applied, and the density, loss on ignition (<i>LOI%</i>), and dynamic light scattering (DLS) of both CPII-F40 and CVM were analyzed. CVM had a lower density than CPII-F40, requiring a mass correction for equivalence, as well as a narrower particle-size distribution and lower polydispersity than cement. Furthermore, the <i>LOI%</i> of CVM complied with the limits established by NBR 16697. Additional analyses included x-ray diffraction (XRD), thermogravimetric analysis (TGA/DTA), x-ray fluorescence spectroscopy (XRF), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), hydrochloric acid (HCl) attack, pozzolanic activity index (<i>IAP%</i>), and mechanical strength tests (compressive strength—(<i>f</i><sub><i>ck</i></sub>), tensile strength—(<i>f</i><sub><i>ct</i></sub>), and flexural strength—(<i>f</i><sub><i>ctf</i></sub>), as well as toxicity assessment, performed on both types of tested concretes. The results demonstrated that CVM exhibited diffraction peaks (XRD) and a chemical composition (XRF), and that the compressive strength of CVM28 (29.87 ± 0.36&#xa0;MPa) was similar to that of CPII-F40 (29.64 ± 0.12&#xa0;MPa) within the 28-day compression range. At 63&#xa0;days, the compression of CVM was 33.66 ± 0.21&#xa0;MPa and CPII-F40 was 32.51 ± 0.11&#xa0;MPa. Other analyses, including chemical resistance, thermal behavior, and toxicity evaluation, showed more significant differences in the concrete containing 30% CVM.</p> Graphical Abstract <p></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

Analysis of the Physical-Chemical, Functional, and Toxic Influence of the Addition of Pozzolanic Ash in CPII-F40 Concrete

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月4日

查看全文
  • B. R. P. Angheben,
  • F. R. Kruger,
  • A. Calsavara,
  • L. Waidemam,
  • J. L. N. Góes,
  • E. Bona,
  • G. T. Tractz,
  • A. P. Peron,
  • O. V. Junior

摘要

The increasing use of concrete in civil construction projects is a current reality, largely driven by the shortage of skilled labor. Pozzolanic ashes originating from the steel industry represent a promising residue for partial cement replacement. This study investigated the substitution of 30% fly ash from thermoelectric power plants (CVM) in Portland Composite Cement with filler (CPII-F40) for concrete production. It was applied, and the density, loss on ignition (LOI%), and dynamic light scattering (DLS) of both CPII-F40 and CVM were analyzed. CVM had a lower density than CPII-F40, requiring a mass correction for equivalence, as well as a narrower particle-size distribution and lower polydispersity than cement. Furthermore, the LOI% of CVM complied with the limits established by NBR 16697. Additional analyses included x-ray diffraction (XRD), thermogravimetric analysis (TGA/DTA), x-ray fluorescence spectroscopy (XRF), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), hydrochloric acid (HCl) attack, pozzolanic activity index (IAP%), and mechanical strength tests (compressive strength—(fck), tensile strength—(fct), and flexural strength—(fctf), as well as toxicity assessment, performed on both types of tested concretes. The results demonstrated that CVM exhibited diffraction peaks (XRD) and a chemical composition (XRF), and that the compressive strength of CVM28 (29.87 ± 0.36 MPa) was similar to that of CPII-F40 (29.64 ± 0.12 MPa) within the 28-day compression range. At 63 days, the compression of CVM was 33.66 ± 0.21 MPa and CPII-F40 was 32.51 ± 0.11 MPa. Other analyses, including chemical resistance, thermal behavior, and toxicity evaluation, showed more significant differences in the concrete containing 30% CVM.

Graphical Abstract