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Interfacial enhancement technology in high‑volume fly ash foam concrete: microscopic mechanism and heavy metal safety assessment

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Applying a large amount of fly ash to foam concrete can greatly reduce the engineering cost, but the proportion of fly ash is limited due to insufficient pozzolanic activity and heavy metal pollution. Therefore, this study used fly ash, portland cement, fly ash ceramsite, foaming agent, etc. as raw materials to design the mix ratio of large-volume fly ash foam concrete. The micro-interface enhancement mechanism was deeply analyzed, and a multi-method pollution assessment system was finally established for the risk assessment of heavy metals. The dry bulk density of the fly ash foam concrete prepared in this study was 894.5 kg/m3, the compressive strength was 4.22 MPa, and the thermal conductivity is 0.2213 W/(m K). These parameters all met the requirements of the Chinese standard “Foam Concrete” (JG/T 266-2011). The microscopic analysis results showed that, compared with the fly ash content of 60%, the foam concrete with 40% fly ash content had more rodlike ettringite at the interface of the pore wall, and its hydration products were distributed more uniformly. Similarly, the interface between the ceramsite mixed with 40% fly ash and the cement stone was more closely combined, the distribution of hydration products between the interfaces was more uniform, and the interface quality was higher. After adding thickener, the pore distribution of fly ash foam concrete was tight, and there were a lot of small pores between the pores, and the pore structure had better connectivity than when no thickener was added. The evaluation results of foamed concrete with 40% fly ash content with the aid of the multi-method pollution assessment system showed that the harmful heavy metals in fly ash were stably solidified in the silicate structure, resulting in low leaching efficiency. Finally, the performance of the high-volume fly ash foamed concrete slab produced according to the mix ratio designed in this study met the requirements of “Light weight panels for partition wall used in buildings” (GB/T 23,451-2009). Therefore, it is a safe and environmentally friendly high-performance building product.
Rocznik
Strony
art. no. e17, 2023
Opis fizyczny
Bibliogr. 44 poz., rys., tab., wykr.
Twórcy
  • School of Material Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • The National Joint Engineering Laboratories of Traffic Civil Materials, Chongqing Jiaotong University, Chongqing 400074, China
autor
  • School of Material Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • School of Material Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • Chongqing Institute of Modern Construction Industry Development, Chongqing, 400039, China
  • Chongqing Construction Science Research Institute Co., Ltd, Chongqing 400000, China
autor
  • School of Material Science and Engineering, Chang’an University, Xi’an 710064, China
autor
  • Chongqing Institute of Modern Construction Industry Development, Chongqing, 400039, China
  • Chongqing Institute of Modern Construction Industry Development, Chongqing, 400039, China
autor
  • Kunming Iron and Steel (Group) Co. Ltd. Technology Innovation Department, Anning 650302, Yunnan, China
  • State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
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Uwagi
PL
Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-59a2e223-5b4e-47c8-8fc5-fe43112e0278
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