Effect of GGBS on performance deterioration of non-dispersible underwater concrete in saline soil

doi:10.3724/SP.J.1226.2022.21037.

Sciences in Cold and Arid Regions ›› 2022, Vol. 14 ›› Issue (2): 120–137.doi: 10.3724/SP.J.1226.2022.21037.

• • 上一篇

收稿日期:2021-05-17 接受日期:2021-09-15 出版日期:2022-04-30 发布日期:2022-04-25

Effect of GGBS on performance deterioration of non-dispersible underwater concrete in saline soil

Fang Liu^1,²,BaoMin Wang³(),GuoRong Tao³,Tao Luo¹,XiaoSa Yuan¹

^1.Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an, Shaanxi 710123, China
^2.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basins, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
^3.School of Civil Engineering, Dalian University of Technology, Dalian, Liaoning 116023, China

Received:2021-05-17 Accepted:2021-09-15 Online:2022-04-30 Published:2022-04-25
Contact: BaoMin Wang E-mail:wangbm@dlut.edu.cn
Supported by:
the National Natural Science Foundation of China(51878116);Liaoning Province Key Project of Research and Development Plan(2020JH2/10100016);Dalian Science and Technology Innovation Fund Project(2020JJ26SN060);the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basins (China Institute of Water Resources and Hydropower Research)(IWHR-SKL-201910);the Special Fund for the Launch of Scientific Research in Xijing University(XJ21T01);the Youth Innovation Team of Shaanxi Universities

摘要/Abstract

Abstract:

In saline soil areas, there are a large number of ions in soil or water environments, such as Cl^- and SO₄^2-, which have strong corrosive interactions with buildings. To study the deterioration of non-dispersible underwater concrete in sulfate, chloride, and mixed salt environments, the compressive strength and deterioration resistance coefficient of the studied concrete mixed with different amounts of ground granulated blast-furnace slag (GGBS) were analyzed in this paper. At the same time, the micro morphology and corrosion products distribution of the studied concrete were observed by means of SEM, plus XRD diffraction, TG-DTG and FT-IR analyses to explore the influence of corrosive solutions on the hydration products of concrete. We also analyzed the mechanism of improving the deterioration resistance of the studied concrete by adding GGBS in a saline soil environment. The results show that the compressive strength of the studied concrete in a chloride environment was close to that in a fresh water environment, which means that chloride has no adverse effect on compressive strength. The deterioration of the studied concrete was most serious in a sulfate environment, followed by mixed salt environment, and the lowest in a chloride environment. In addition, by adding GGBS, the compressive strength and deterioration resistance of the studied concrete could be effectively improved.

Key words: saline soil, non-dispersible underwater concrete, granulated blast furnace slag, deterioration resistance, mechanism analysis

. [J]. Sciences in Cold and Arid Regions, 2022, 14(2): 120–137.

Fang Liu,BaoMin Wang,GuoRong Tao,Tao Luo,XiaoSa Yuan. Effect of GGBS on performance deterioration of non-dispersible underwater concrete in saline soil[J]. Sciences in Cold and Arid Regions, 2022, 14(2): 120–137.

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Specific surface area (m²/kg)	Setting time (min)		Ignition Loss	Strength at 3d (MPa)		Strength at 7d (MPa)		Strength at 28d (MPa)
Specific surface area (m²/kg)	Initial setting	Final setting	Ignition Loss	Flexural strength	Compressive strength	Flexural strength	Compressive strength	Flexural strength	Compressive strength
330	227	282	3.61%	4.6	21.2	6.8	35	7.6	44.8

Cement type	Chemical composition
Cement type	CaO	SiO₂	Al₂O₃	Fe₂O₃	SO₃	MgO	Na₂O	K₂O
P·O 42.5R	61.16%	21.49%	5.24%	2.89%	2.53%	2.12%	0.76%	0.42%

Type	Chemical composition
Type	CaO	SiO₂	Al₂O₃	MgO	SO₃	TiO₂	K₂O	MnO	Fe₂O₃	Na₂O₃
S105	40.075%	30.311%	14.991%	8.595%	3.219%	0.839%	0.501%	0.399%	0.388%	0.324%

Solution type	Ion contentv (mg/L)
Solution type	Cl^-	SO₄^2-
NaCl	50,000	-
Na₂SO₄	-	20,000
Na₂SO₄+NaCl	50,000	20,000

Groups	water-binder ratio	Water (kg)	Binding material			Sand ratio	Fine aggregate (kg)	Coarse aggregate (kg)	Water reducer	Flocculant
Groups	water-binder ratio	Water (kg)	Total mass (kg)	Cement (kg)	Slag powder	Sand ratio	Fine aggregate (kg)	Coarse aggregate (kg)	Water reducer	Flocculant
0.45-O	0.45	200	445	445	0%	40%	690	1,035	0.5%	2.8%
0.45-SL1	0.45	200	445	356	20%	40%	690	1,035	0.5%	2.8%
0.45-SL2	0.45	200	445	267	40%	40%	690	1,035	0.5%	2.8%
0.45-SL3	0.45	200	445	178	60%	40%	690	1,035	0.5%	2.8%

Effect of GGBS on performance deterioration of non-dispersible underwater concrete in saline soil

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Groups	Slump (mm)		Slump expansion (mm)
Groups	30 s	120 s	30 s	120 s
0.45-O	220	245	385	425
0.45-SL1	230	250	390	450
0.45-SL2	240	255	420	480
0.45-SL3	230	250	395	490

Groups	Deterioration resistance coefficient
Groups	7 days	28 days	56 days	90 days	180 days	360 days
0.45-O-SY	0.94	0.94	0.88	0.91	0.86	0.81
0.45-SL1-SY	0.96	0.93	0.91	0.93	0.93	0.90
0.45-SL2-SY	0.92	0.91	0.94	0.99	0.95	0.92
0.45-SL3-SY	0.94	0.98	1.01	0.99	0.98	0.94

Sample	AFt (9.12°)		Friedel's salt (11.12°)		CaSO₄·2H₂O （11.70°）		Ca(OH)₂ （18.15°）
Sample	28 days	360 days	28 days	360 days	28 days	360 days	28 days	360 days
0.45-O-S	317	576	212	319	296	574	1,951	3,268
0.45-O-LY	569	598	327	406	261	261	1,824	2,004
0.45-SL3-LY	358	548	979	1,199	302	335	452	469