|
1
|
Zhang T, Ma B, Tan H, Liu X, Chen P, Luo Z. Effect of TIPA on mechanical properties and hydration properties of cement-lithium slag system. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 276:111274. [PMID: 32911386 DOI: 10.1016/j.jenvman.2020.111274] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 08/03/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
Effect of triisopropanolamine (TIPA) on compressive strength and hydration properties of cement-lithium slag (LS, 30%) paste was studied. The results demonstrated that the addition of TIPA is advantageous for compressive strength at 7 d, 28 d and 60 d. The reason was related to the pore complexity and hydration process of cement and LS. TIPA reduced the total porosity, and increased the fractal dimension, making the pore structure more complicated. In addition, TIPA promoted the pozzolanic reaction of LS and the hydration of cement, expediting the formation of C-S(A)-H gel. TIPA accelerated the dissolution of aluminate ions, silicate ions and ferric ions in the pore solution, thereby accelerating the pozzolanic reaction of LS. During the hydration of cement-LS paste, TIPA facilitated the conversion of ettringite to the AFm-like phase and produced more C-A-S-H gel by promoting the dissolution of aluminate ions.
Collapse
Affiliation(s)
- Ting Zhang
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China; School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China
| | - Baoguo Ma
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China
| | - Hongbo Tan
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China.
| | - Xiaohai Liu
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China
| | - Pian Chen
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China
| | - Zhongtao Luo
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, China
| |
Collapse
|
|
2
|
Šiler P, Kolářová I, Novotný R, Másilko J, Bednárek J, Janča M, Koplík J, Hajzler J, Matějka L, Marko M, Švec J, Zlámal M, Kuzielová E, Opravil T, Šoukal F. Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. MATERIALS 2020; 13:ma13225215. [PMID: 33218145 PMCID: PMC7698924 DOI: 10.3390/ma13225215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Revised: 10/31/2020] [Accepted: 11/16/2020] [Indexed: 12/05/2022]
Abstract
Increasing utilization of secondary raw materials and alternative fuels results in increasing contents of metals in cements. Zinc is one of these elements. It comes to cement with secondary raw materials such as slag or fly ash or by the utilization of used tires as an alternative fuel. Zinc ions significantly prolong the hydration process in cement. This work deals with the influence of zinc ions in the form of very poorly soluble ZnO salt and easily soluble ZnCl2 and Zn(NO3)2 on the hydration of cement blended with fly ash. Zinc was dosed in the range of 0.05%, 0.1%, 0.5% and 1% of cement weight. The effect of zinc on hydration was monitored by isothermal and isoperibolic calorimetry. A 15% addition of fly ash to cement mainly causes further retardation of hydration reactions due to the reactions of fly ash particles with Ca2+ ions from cement. The strongest effect on the hydration retardation from all investigated compounds showed in ZnO as it dissolves very slowly. On the contrary, for the dosage of 1% of zinc in the form of ZnCl2 significant acceleration of hydration occurred. In this work, a synergistic effect on the prolongation of hydration with a combination of cement, zinc and fly ash was demonstrated. The lengths of induction periods were assessed from detected calorimetric curves and from these lengths the curves were gained by fitting with the exponential function. Final products were next analyzed using X-ray diffraction.
Collapse
Affiliation(s)
- Pavel Šiler
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
- Correspondence: ; Tel.: +42-06-0353-4081
| | - Iva Kolářová
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - Radoslav Novotný
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - Jiří Másilko
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - Jan Bednárek
- Institute of Environmental Technology, Technical University of Ostrava, CZ-70800 Ostrava, Czech Republic;
| | - Martin Janča
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - Jan Koplík
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - Jan Hajzler
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - Lukáš Matějka
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - Michal Marko
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - Jiří Švec
- Faculty of Civil Engineering, Institute of Concrete and Masonry Structures, Brno University of Technology, CZ-60200 Brno, Czech Republic; (J.Š.); (M.Z.)
| | - Martin Zlámal
- Faculty of Civil Engineering, Institute of Concrete and Masonry Structures, Brno University of Technology, CZ-60200 Brno, Czech Republic; (J.Š.); (M.Z.)
| | - Eva Kuzielová
- Institute of Construction and Architecture, Slovak Academy of Sciences, SK-845 03 Bratislava, Slovak;
| | - Tomáš Opravil
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| | - František Šoukal
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic; (I.K.); (R.N.); (J.M.); (M.J.); (J.K.); (J.H.); (L.M.); (M.M.); (T.O.); (F.Š.)
| |
Collapse
|
|
3
|
Šiler P, Kolářová I, Novotný R, Másilko J, Bednárek J, Janča M, Koplík J, Hajzler J, Matějka L, Marko M, Pokorný P, Opravil T, Šoukal F. Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag. MATERIALS 2019; 12:ma12182930. [PMID: 31510096 PMCID: PMC6766343 DOI: 10.3390/ma12182930] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 09/06/2019] [Accepted: 09/08/2019] [Indexed: 11/16/2022]
Abstract
This work deals with the influence of zinc on cement hydration. The amount of zinc in cement has increased over recent years. This is mainly due to the utilization of solid waste and tires, which are widely used as a fuel in a rotary kiln. Zinc can also be introduced to cement through such secondary raw materials as slag, due to increased recycling of galvanized materials. The aim of this work was to determine the effect of zinc on the hydration of Portland cement, blended with ground blast furnace slag (GBFS). This effect was studied by isothermal and isoperibolic calorimetry. Both calorimetry methods are suitable for measurements during the first days of hydration. Isoperibolic calorimetry monitors the hydration process in real-life conditions, while isothermal calorimetry does so at a defined chosen temperature. Zinc was added to the cement in the form of two soluble salts, namely Zn(NO3)2, ZnCl2, and a poorly soluble compound, ZnO. The concentration of added zinc was chosen to be 0.05, 0.1, 0.5, and 1mass percent. The amount of GBFS replacement was 15% of cement dosage. The newly formed hydration products were identified by X-ray diffraction method (XRD).
Collapse
Affiliation(s)
- Pavel Šiler
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic.
| | - Iva Kolářová
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Radoslav Novotný
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Jiří Másilko
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Jan Bednárek
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
- Technical University of Ostrava, Institute of Environmental Technology, 17. listopadu 2172/15, CZ-70800 Ostrava, Czech Republic
| | - Martin Janča
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Jan Koplík
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Jan Hajzler
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Lukáš Matějka
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Michal Marko
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Přemysl Pokorný
- Institute of Automotive Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, CZ-61669 Brno, Czech Republic
| | - Tomáš Opravil
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - František Šoukal
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| |
Collapse
|