| Effect of the Calcium-Silicon Ratio on the Properties of
Composite Cementing Materials |
Yunan Wan,a
Jianhong Wang,a, * Zhiyong Lia
and Hongping Zhangb
Pages : 40-45
DOI :10.1080/0371750X.2022.2160375 |
| Abstract |
| Cement is the most commonly used inorganic cementing material in construction
engineering owing to its stable performance; however, cement production requires a
considerable amount of energy. To reduce energy consumption, inorganic cementing
materials were prepared by solid waste to replace parts of the cement. In this
experiment, composite cementing material was prepared by mixing ultrafine fly ash,
lime and gypsum; then, this material was hydrated at a calcium-to-silicon (C/S) ratio
of 0.6-2.2. The effects of various C/S ratios on the properties of the prepared composite
cementing material were investigated. The results showed that when the C/S ratio
was 1.6, the compressive and flexural strengths of the composite cementing material
reached their maximum. With the increase of C/S ratio, the production of C–S–H gel
and ettringite increased; the two products got interwoven, filling the pores of hydration
products and increasing the strength of the cementing material. When the C/S ratio was
2.0, the carbonization rate of the cementing materials increased. Calcite coated the surface
of the fly ash, preventing the pozzolanic reaction of the fly ash and reducing the overall
strength of the material.
[Keywords: Calcium-silicon ratio, Composite cementing material, Hydration
mechanism, Ultrafine fly ash] |
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