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Effect of particle size of periclase on hydration expansion of periclase in low heat Portland cement paste

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Document pages: 8 pages

Abstract: In this paper, low heat Portland cement (LHC) clinker was prepared by calcining at 1350 ° C for 2.0 hours, 1400 ° C for 1.0 hours, 1400 ° C for 1.5 hours, 1400 ° C for 2.0 hours, 1450 ° C for 1.0 hours and 1450 ° C for 2.0 hours. Clinker is ground with gypsum to produce LHC. The particle size of periclase was analyzed by bsem. The swelling of LHC paste caused by periclase hydration was measured. The hydration degree of periclase in LHC slurry was quantitatively determined by XRD internal standard method and bsem method. The results show that the particle size of periclase is larger when the clinker is calcined at higher temperature or for a long time. Smaller periclase (2.60   in LHC paste, μ m) The hydration rate of is faster. Therefore, the expansion of LHC slurry is relatively fast. Smaler particle of periclase in clinker tends to result in higher hydration degree of periclase in pastes cured at 20°C for 240 days, and there is a small amount of brucite appearing around periclase. The hydration rate of 4.00 μm periclase particle in cement paste cured at 80°C is obviously faster than that in paste cured at 20°C and 40°C. When cement paste was cured at 80°C for 7 days, the periclase was hydrated for 32.56 . The smaller size periclase (1–3 μm) had fully hydrated when the curing age was 240 days, and a large amount of brucite was produced around the larger periclase particle.

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