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

Jean Jacques Kouadjo Tchekwagep; Wang Zengyao; Yang Fengzhen; Zhao Piqi; Shifeng Huang; Shoude Wang; Xin Cheng Cheng

doi:10.2478/msp-2022-0044

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

Materials Science-Poland

Volume 40 (2022): Issue 4 (December 2022)

By: Jean Jacques Kouadjo Tchekwagep, Wang Zengyao, Yang Fengzhen, Zhao Piqi, Shifeng Huang, Shoude Wang and Xin Cheng Cheng

Open Access

|Mar 2023

Figures & Tables

Chemical composition of the artificial sand

Table 1

Fine aggregate gradation

Sieve size (mm)	%passing	Heat conductivity W/(m·C)	Purchase price in the Chinese market US$/kg
Gradation		Heat conductivity W/(m·C)	Purchase price in the Chinese market US$/kg
0–0.6	20
0.6–1.18	45	0.27	39	River sand
1.18–2.36	25	0.05	49	Artificial sand
2.36–4.75	10	0.12	90	Basalt sand

Table 2

CSA chemical composition weight in percentage

CaO	Al₂O₃	SO₃	SiO₂	Fe₂O₃	MgO	TiO₂	K₂O	SrO	Na₂O	Cl	P₂O₅
519.4	86.2	86.2	40.5	80.0	13.1	5.1	6.8	59.9	0.5	1.3	0.5
45.28%	17.51%	15.76%	9.19%	2.50%	1.90%	0.75%	0.48%	0.17%	0.19%	0.11%	0.10%

Table 3

Mixing of the mortar samples

Number of samples	CSA (g)	water	Different type of sand (g) River, Basalt, Artificial	water/cement ratio	Temperature °C
36 (12 for each type of sand)	450	225	1350	0.5	20,100,200,300

Table 4

Strength of the different samples

Strength (MPa)		Heating temperature/°C
Strength (MPa)		Reference sample	Standard deviation of the compressive strength and flexural strength at 20°C	100°C	Standard deviation of the compressive strength and flexural strength at 100°C	Loss rate %
RSM NAC	Compressive strength	21	1.55	10.8	1.17	48.6
Flexural strength	4.7	1.00	3.7	1.36	21.3
ASM NAC	Compressive strength	25	3.43	22.1	1.02	11.6
Flexural strength	5.9	0.78	5.4	0.68	8.5
BSM NAC	Compressive strength	27.1	3.88	14.8	0.82	45.4
Flexural strength	5.1	0.97	4.9	0.85	3.9

Strength (MPa)		Heating temperature/°C
Strength (MPa)		200°C	Standard deviation of the compressive strength and flexural strength at 200°C	Loss rate %	300°C	Standard deviation of the compressive strength and flexural strength at 300°C	Loss rate %
RSM NAC	Compressive strength	6.3	0.40	70	5.2	0.76	75.2
Flexural strength	1.2	1.46	74.5	1.2	0.42	74.5
ASM NAC	Compressive strength	6.9	0.98	72.4	5	1.75	80
Flexural strength	1.5	0.05	74.6	0.8	0.41	86.4
BSM NAC	Compressive strength	5.66	1.29	79.1	3.05	1.21	88.7
Flexural strength	2	0.34	60.8	1.8	0.33	64.7

Table 5

Strength loss vs. temperature

	20°C	100 °C		200° C		300 °C
	20°C	Strength MPa	Loss in %	Strength MPa	Loss in %	Strength MPa	Loss in %
RSM Compressive strength	21	10.8	(−)48.6	6.3	(−)70	5.2	(−)75.2
RSM Flexural strength	4.7	3.7	(−)21.3	1.2	(−)74.5	1.2	(−)74.5
ASM Compressive strength	25	22.1	(−)11.6	6.9	(−)72.4	5	(−)80
ASM Flexural strength	5.9	5.4	(−)8.5	1.5	(−)74.6	0.8	(−)86.4
BSM Compressive strength	27.1	14.8	(−)45.4	5.66	(−)79.1	3.05	(−)88.7
BSM Flexural strength	5.1	4.9	(−)3.9	2	(−)60.8	1.8	(−)64.7

Microscopic image of mortar sample after different temperature exposure

EDS of the different CSA mortars when heated

Table 6

The average atomic ratios obtained by EDS in the different heated mortar samples

Experimental EDS ratios	Different sample	Ca/Si	Ca/Al	Ca/S
Belite Ye’elimite Alite	NAC_ RSM_ 100°C	3.04	6.75	7.36
Belite Ye’elimite Alite	NAC_ RSM_ 200°C	5.34	5.40	5.39
Belite Ye’elimite Alite	NAC_ RSM_ 300°C	0.36	0.68	3.64
Belite Ye’elimite Alite	NAC_ ASM_ 100°C	5.79	3.80	3.08
Belite Ye’elimite Alite	NAC_ ASM_ 200°C	3.92	2.83	6.85
Belite Ye’elimite Alite	NAC_ ASM_ 300°C	10.50	17.93	16.70
Belite Ye’elimite Alite	NAC_ BSM_ 100°C	5.16	7.41	8.40
Belite Ye’elimite Alite	NAC_ BSM_ 200°C	3.17	4.64	4.40
Belite Ye’elimite Alite	NAC_ BSM_ 300°C	130.35	33.76	12.91

[i] Belite – C2S, Ye’elimite – Ca₄Al₆O₁₂(SO₄), Alite – C3S, NAC – natural air cooling

References

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DOI: https://doi.org/10.2478/msp-2022-0044 | Journal eISSN: 2083-134X (formerly 2083-124X) | Journal ISSN: 2083-1331

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Language: English

Page range: 64 - 77

Submitted on: Nov 20, 2022

Accepted on: Feb 10, 2023

Published on: Mar 30, 2023

Published by: Wroclaw University of Science and Technology

In partnership with: Paradigm Publishing Services

Keywords:

fine aggregate,

CSA cement,

blend,

mechanical performance,

heating

Related subjects:

Materials sciences,

Materials sciences, other,

Nanomaterials,

Functional and smart materials,

Materials characterization and properties

© 2023 Jean Jacques Kouadjo Tchekwagep, Wang Zengyao, Yang Fengzhen, Zhao Piqi, Shifeng Huang, Shoude Wang, Xin Cheng Cheng, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 40 (2022): Issue 4 (December 2022)

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

Figures & Tables

Fig. 1

Fig. 2

Fig. 3

Table 1

Table 2

Table 3

Table 4

Table 5

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Table 6

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