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A platform for research: civil engineering, architecture and urbanism
The proportion, performances and mechanism of phosphogypsum- lime-fly ash binder
In China, the lime-fly ash road base material, known as one kind of semi-rigid base materials, has many technical advantages, such as good water stability, good anti-cracking property and long-term development of strength. Besides, it consumes a large amount of fly ash, which does not only protect the environment but also reduces the exploitation and use of natural resources. So the lime-fly ash road base material has been widely used in China, especially in the areas where there are plenty of fly ash resources. However, the lime-fly ash road base material has a vital fault that its early-age strength is very low, which limits its extensive usage. This paper deals with the formulation of a binder based on phosphogypsum, lime and fly ash. The proportion and performances of the binder are presented. It was found that the suitable proportion for the binder was 8 - 10 % lime and 30 - 50 % phosphogypsum, and the phosphogypsum-lime-fly ash binder had better anti-erosion, water stability and higher splitting strength, resilient modulus than the lime-fly ash binder. The mechanism of the binder studied by SEM and MIP showed that phosphogypsum hastened the pozzolanic reaction between lime and fly ash in the early age and the product C-A-H in lime-fly ash binder was substituted by ettringite in phosphogypsum-lime-fly-ash binder.
The proportion, performances and mechanism of phosphogypsum- lime-fly ash binder
In China, the lime-fly ash road base material, known as one kind of semi-rigid base materials, has many technical advantages, such as good water stability, good anti-cracking property and long-term development of strength. Besides, it consumes a large amount of fly ash, which does not only protect the environment but also reduces the exploitation and use of natural resources. So the lime-fly ash road base material has been widely used in China, especially in the areas where there are plenty of fly ash resources. However, the lime-fly ash road base material has a vital fault that its early-age strength is very low, which limits its extensive usage. This paper deals with the formulation of a binder based on phosphogypsum, lime and fly ash. The proportion and performances of the binder are presented. It was found that the suitable proportion for the binder was 8 - 10 % lime and 30 - 50 % phosphogypsum, and the phosphogypsum-lime-fly ash binder had better anti-erosion, water stability and higher splitting strength, resilient modulus than the lime-fly ash binder. The mechanism of the binder studied by SEM and MIP showed that phosphogypsum hastened the pozzolanic reaction between lime and fly ash in the early age and the product C-A-H in lime-fly ash binder was substituted by ettringite in phosphogypsum-lime-fly-ash binder.
The proportion, performances and mechanism of phosphogypsum- lime-fly ash binder
Zhou, Mingkai (author) / Zhao, Qinglin (author) / Zha, Jin (author) / Shen, Weiguo (author)
2006
8 Seiten, 7 Bilder, 4 Tabellen, 3 Quellen
Conference paper
English
Zement , Zementbrennen , Zementindustrie , Zementklinker , Gips , Baustoff , Flugasche , Flugaschenzement , Kohlenasche , Abfallverwertung , Straßenbau , China
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