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Materials and Structures

, Volume 49, Issue 4, pp 1105–1114 | Cite as

Study of aluminum sulfate and anhydrite on cement hydration process

Original Article

Abstract

The influences of aluminum sulfate (AS) introduction and dosage on setting time, hydration heat evolution, hydration product type and pore structure of Portland cement were studied, and the influence of AS on concrete strength was investigated also. The results indicate that AS can effectively accelerate setting time of Portland cement and enhance concrete at early age (1 day) strength. AS can promote hydration process of calcium aluminate but inhibit that of calcium silicate. The effect of AS on hydration process becomes more significant along with the increased dosage; and the introduction of AS can promote the formation of AFt. The research results of this paper favor the opinion of the existence of AFt precursor; and the AFt precursor is amorphous AFm which could not be identified by XRD. With anhydrite as setting regulator, the amorphous AFm retention time is prolonged, and the endothermal peaks produced by amorphous AFm during DSC–MS measurement correspond to 80–160 and 830–910 °C, losing H2O and SO2 respectively.

Keywords

Cement Aluminum sulfate Anhydrite Hydration AFt Amorphous AFm MS 

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Copyright information

© RILEM 2015

Authors and Affiliations

  1. 1.Department of Civil EngineeringTsinghua UniversityBeijingChina
  2. 2.Department of Civil, Construction and Environmental EngineeringIowa State UniversityAmesUSA
  3. 3.Technology Center of China Railway Tunnel Co., LtdLuoyangChina

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