Effect of type, form, and dosage of activators on strength of alkali-activated natural pozzolans
Source abstract
Abstract
Abstract It is possible to synthesize environmentally friendly cementitious construction materials from alkali-activated natural pozzolans. The effect of the alkaline medium on the strength of alkali-activated natural pozzolans has been investigated and characterised. This paper highlights the effect of the type and form of the alkaline activator, the dosage of alkali and the SiO2/Na2O ratio (silica modulus, Ms) when using water–glass solutions and different curing conditions on the geopolymerisation of natural pozzolans. Activation of natural and calcined pozzolan for production of geopolymeric binder was verified by using Taftan andesite and Shahindej dacite from Iran as a solid precursor. The optimum range for each factor is suggested based on the different effects they have on compressive strength. The concentration of dissolving silicon, aluminium and calcium in alkaline solution, the formation of gel phase and the factors affecting this have been studied by using leaching tests, ICP–AES, and FTIR.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Concrete and Cement Materials Research · Magnesium Oxide Properties and Applications · Innovative concrete reinforcement materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (16)
Show source-provided references
1. Comparison of different methods for enhancing reactivity of pozzolan10.1016/S0008-8846(01)00481-1 ↗
2. Shi C. An overview on the activation of reactivity of natural pozzolan. NCR Canada; 2001.10.1139/l01-041 ↗
3. Bondar D. Alkali activation of Iranian natural pozzolans for producing geopolymer cement and concrete. A dissertation submitted to University of Sheffield in fulfilment of the requirements for the degree of Doctor of Philosophy, UK; 2009.
4. Bondar D, Lynsdale CJ, Neil B. Milestone, Ramezanianpour AA. Alkali-activation of natural pozzolan for geopolymer cement production. In: Proc int conf: sustainable construction materials and technologies 2007 Coventry, England, ISBN 13: 978-0-415-44689-1, p. 313–7.
5. Geopolymers: inorganic polymeric new materials
6. Palomo A, Macias A, Blanco MT, Puertas F. Physical, chemical and mechanical characterisation of geopolymers. In: Proc 9th internat congress the Chem Cement; 1992. p. 505–11.
7. Geopolymer technology: the current state of the art10.1007/s10853-006-0637-z ↗
8. Davidovits J. Chemistry of geo-polymeric systems, terminology, Presented at the Geopolymer 99 International Conference, France; 1999.
9. The effect of alkali metals on the formation of geopolymeric gels from alkali-feldspar10.1016/S0927-7757(02)00499-5 ↗
10. The geo-polymerisation of alumino-silicate minerals10.1016/S0301-7516(99)00074-5 ↗
11. Alkali-activated fly ashes, a cement for the future10.1016/S0008-8846(98)00243-9 ↗
12. Shi · 2006
13. Factors affecting the strength of alkali-activated slag10.1016/0008-8846(94)90026-4 ↗
14. The effect of alkali metals on the formation of geopolymeric gels form alkali-feldspars10.1016/S0927-7757(02)00499-5 ↗
15. Use of infrared spectroscopy to study geopolymerisation of heterogeneous amorphous alumina silicates10.1021/la026127e ↗
16. McDonald M, Thompson JL. Sodium silicate a binder for the 21st century, National silicates and PQ Corporation of Industrial Chemicals Division 2006.