A chemical rationalization of the processing and application of the mortar coatings: Structural, thermodynamic, and fluorescence properties

Lima, Nathan B.; Rogerio, V.A.; Belarmino, Marcia K.D.L.; Silva, Anderson I. S.; Ioras, Renan U.F.; Oliveira, Romilde Almeida de

doi:10.1016/j.molstruc.2018.03.086

Cited by 6 publications

(1 citation statement)

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“…In actual engineering, the surface of a concrete structure is covered with a layer of plastering mortar to protect the concrete from erosion and provide a decorative effect [15,16]. Under fire, the plastering layer can act as a barrier to decelerate the change of temperate of the internal concrete structure.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Degradation Mechanism of Concrete with Plastering Layer

Liu

Chen

2022

Materials

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At present, the research on the high temperature degradation of concrete usually focuses on only the degradation of concrete itself without considering the effect of the plastering layer. It is necessary to take into account the influence of the plastering layer on the high temperature degradation of concrete. With an increase in the water/cement ratio, the explosion of concrete disappeared. Although increasing the water/cement ratio can alleviate the cracking of concrete due to lower pressure, it leads to a decrease in the mechanical properties of concrete after heating. It is proved that besides the water/cement ratio, the apparent phenomena and mechanical properties of concrete at high temperature can be affected by the plastering layer. The plastering layer can relieve the high temperature cracking of concrete, and even inhibit the high temperature explosion of concrete with 0.30 water/cement ratio. By means of an XRD test, scanning electron microscope test and thermogravimetric analysis, it is found that the plastering layer can promote the rehydration of unhydrated cement particles of 0.30 water/cement ratio concrete at high temperature and then promote the mechanical properties of concrete at 400 °C. However, the plastering layer accelerated the thermal decomposition of C-S-H gel of concrete with a water/cement ratio of 0.40 at high temperature, and finally accelerate the decline of mechanical property of concrete. To conclude, the low water/cement ratio and plastering layer can delay the deterioration of concrete at high temperature.

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Section: Introductionmentioning

confidence: 99%