Quantitative Rietveld analysis of the decomposition of hardened rapid sulphoaluminate cement after exposure to elevated temperatures

Tchekwagep, Jean Jacques Kouadjo; Chen, Dangui; Mukhopadhyay, Anol; Wang, Shoude; Huang, Shifeng; Cheng, Xin

doi:10.1007/s43452-021-00265-9

Cited by 7 publications

(2 citation statements)

References 50 publications

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“…The reduction of compressive strength can be attributed to the separation of free water caused by high temperature and the decomposition of hydrophilic products. This result correlates with the research study published by Kouadjo where he observed a chemical decomposition of the CSA as temperature rises [38]. The difference in mechanical properties of mortars made from different sands can be attributed to the differences between the shape, particle size, and surface area of the sand.…”

Section: Discussion and Significancesupporting

confidence: 90%

The ability of different types of sand to preserve the integrity of calcium sulfoaluminate cement cement mortar during exposure to elevated temperatures

Tchekwagep

Zengyao

Yang

et al. 2022

Materials Science-Poland

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Due to the depletion of natural sand resources, it is urgent to develop synthetic sand that will replace the natural one in the production of concrete. In this study, we carried out descriptive inspection of mortar working performance, mechanical properties and internal cracking under three different application schemes of fine aggregate, including natural, artificial, and basalt sand. Tests showed that the mortar with river sand had more internal cracking and lowest strength as the temperature rises. The artificial and basalt sand had better resistance and less internal cracking than river sand at high temperature. The compressive strength of basalt sand mortar (BSM) was slightly higher than that of artificial sand mortar (ASM), while the compressive strength value of river sand mortar (RSM) was the lowest at room temperature. However, when heated to 100°C, the RSM had 48% loss of strength, followed by the BSM at 45.4% and ASM at 11.6%. Above 100°C, none of the mortar samples meet the requirement of the calcium sulfoaluminate cement 42.5. The average atomic ratios (Ca/Si, Ca/Al, and Ca/Si) for the ASM and BSM increased with the rise in temperature. XRD showed that above 100°C, the diffraction peaks of Ettringite (AFt) disappeared, the number of CaSO4 diffraction peaks decreased significantly, the intensity decreased, and a diffraction peak of CaCO3 appeared.

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Section: Discussion and Significancesupporting

confidence: 90%

The ability of different types of sand to preserve the integrity of calcium sulfoaluminate cement cement mortar during exposure to elevated temperatures

Tchekwagep

Zengyao

Yang

et al. 2022

Materials Science-Poland

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“…This mixture is self-compacting [ 38 ], so it is no need to compact during the construction [ 39 ]. At the same time, sulfoaluminate fast-hardening cement can quickly develop strength [ 40 ], Which is beneficial to quickly repair the road.…”

Section: Introductionmentioning

confidence: 99%

Research on Design and Performance of Self-Compacting Cement Emulsified Bitumen Mixture (CEBM)

Feng

et al. 2022

Materials

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To meet the needs of the road industry for maintenance operations, a new cement emulsified bitumen mixture (CEBM) with early-strength, self-compacting, and room-temperature construction characteristics was designed. The strength formation mechanism of CEBM was revealed with a scanning electron microscope (SEM) and the surface free energy (SFE) theory. The mechanical properties and road performance of the CEBM were investigated extensively. The results show that before the demulsification of emulsified bitumen, the SFE of the bitumen–aggregate–water three-phase system was reduced due to the replacement of the bitumen–aggregate interface with water. The adhesion work between the emulsified bitumen and the aggregate is negative, which means the adhesion between the emulsified bitumen and the aggregate will not occur spontaneously due to the existence of water. The liquid emulsified bitumen improves the workability of the mixture and ensures that the mixture can be evenly mixed and self-compacted. After demulsification, the work of adhesion between the residual bitumen and the aggregate is positive, which means residual bitumen and aggregate can bond spontaneously. In addition, the hydration products of cement and aggregate form a skeleton, and the emulsified bitumen film wraps and bonds the cement and aggregate together, creating strength. The emulsified bitumen, cement content, and curing conditions have significant effects on the stability of CEBM. The recommended dosage of emulsified bitumen and cement is 8% and 8–10%, respectively. This material integrates the hardening effect of cement and the viscoelastic performance of bitumen and has good workability, mechanical properties, and road performance. Therefore, the CEBM is technically feasible for application to bitumen pavement.

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Development and Application of High-Performance Grouting Materials for Anchoring Pipe in Soft Rock Tunnel

Zhang,

Chen,

Chen

et al. 2023

KSCE J Civ Eng

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Quantitative Rietveld analysis of the decomposition of hardened rapid sulphoaluminate cement after exposure to elevated temperatures

Cited by 7 publications

References 50 publications

The ability of different types of sand to preserve the integrity of calcium sulfoaluminate cement cement mortar during exposure to elevated temperatures

The ability of different types of sand to preserve the integrity of calcium sulfoaluminate cement cement mortar during exposure to elevated temperatures

Research on Design and Performance of Self-Compacting Cement Emulsified Bitumen Mixture (CEBM)

Development and Application of High-Performance Grouting Materials for Anchoring Pipe in Soft Rock Tunnel

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