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

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

Fang Liu1,2,BaoMin Wang3(),GuoRong Tao3,Tao Luo1,XiaoSa Yuan1   

  1. 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

Abstract:

In saline soil areas, there are a large number of ions in soil or water environments, such as Cl- and SO42-, 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

Table 1

Properties of cement"

Specific surface area (m2/kg)Setting time (min)Ignition LossStrength at 3d (MPa)Strength at 7d (MPa)Strength at 28d (MPa)
Initial settingFinal settingFlexural strengthCompressive strengthFlexural strengthCompressive strengthFlexural strengthCompressive strength
3302272823.61%4.621.26.8357.644.8

Table 2

Chemical composition of cement"

Cement typeChemical composition
CaOSiO2Al2O3Fe2O3SO3MgONa2OK2O
P·O 42.5R61.16%21.49%5.24%2.89%2.53%2.12%0.76%0.42%

Table 3

Properties of GGBS"

Grade

Specific surface area

(m2/kg)

Apparent density

(kg/m3)

Moisture contentActivity index
7 days28 days
S1056052,8400.50%93%125%

Table 4

Chemical composition of GGBS"

TypeChemical composition
CaOSiO2Al2O3MgOSO3TiO2K2OMnOFe2O3Na2O3
S10540.075%30.311%14.991%8.595%3.219%0.839%0.501%0.399%0.388%0.324%

Table 5

Corrosive ion content in salt solution"

Solution typeIon contentv (mg/L)
Cl-SO42-
NaCl50,000-
Na2SO4-20,000
Na2SO4+NaCl50,00020,000

Table 6

Mix proportion design of non-dispersible underwater concrete"

Groupswater-binder ratio

Water

(kg)

Binding materialSand ratioFine aggregate (kg)Coarse aggregate (kg)Water reducerFlocculant

Total mass

(kg)

Cement

(kg)

Slag powder
0.45-O0.452004454450%40%6901,0350.5%2.8%
0.45-SL10.4520044535620%40%6901,0350.5%2.8%
0.45-SL20.4520044526740%40%6901,0350.5%2.8%
0.45-SL30.4520044517860%40%6901,0350.5%2.8%

Table 7

Fluidity results of non-dispersible underwater concrete"

GroupsSlump (mm)Slump expansion (mm)
30 s120 s30 s120 s
0.45-O220245385425
0.45-SL1230250390450
0.45-SL2240255420480
0.45-SL3230250395490

Table 8

Results of anti-dispersion property of non-dispersible underwater concrete"

GroupsContent of suspended substance (mg/L)
0.45-O61
0.45-SL167
0.45-SL275
0.45-SL3124

Figure 1

Influence of GGBS addition on compressive strength"

Figure 2

Influence of GGBS addition on compressive strength in a sulfate environment"

Table 9

Deterioration resistance coefficient of non-dispersible underwater concrete in a sulfate environment"

GroupsDeterioration resistance coefficient
7 days28 days56 days90 days180 days360 days
0.45-O-SY0.940.940.880.910.860.81
0.45-SL1-SY0.960.930.910.930.930.90
0.45-SL2-SY0.920.910.940.990.950.92
0.45-SL3-SY0.940.981.010.990.980.94

Figure 3

SEM image of non-dispersible underwater concrete in a fresh water environment for 28 days"

Figure 4

SEM image of non-dispensable underwater concrete in a sulfate environment for 28 days"

Figure 5

SEM image of non-dispersible underwater concrete in a fresh water environment for 360 days"

Figure 6

SEM image of non-dispensable underwater concrete in a sulfate environment for 360 days"

Figure 7

XRD patterns of cement pastes in a sulfate environment"

Table 10

Peak intensity of main phase of cement pastes at ages of 28 days and 360 days"

GroupsAFt (9.12°)CaSO4·2H2O (11.70°)Ca(OH)2 (18.15°)
28 days360 days28 days360 days28 days360 days
0.45-O-S3175762965741,9513,268
0.45-O-SY3646886779028671,326
0.45-SL3-SY250536396760687295

Figure 8

TG/DTG analysis of cement paste samples cured in freshwater for 180 days"

Figure 9

TG/DTG analysis of cement paste samples cured in a sulfate environment for 180 days"

Figure 10

FT-IR analysis of cement paste samples cured in a sulfate environment"

Figure 11

Influence of GGBS addition on the compressive strength in a chloride environment"

Table 11

Deterioration resistance coefficient of non-dispersible underwater concrete in a chloride environment"

GroupsDeterioration resistance coefficient
7 days28 days56 days90 days180 days360 days
0.45-O-LY0.920.990.971.000.950.98
0.45-SL1-LY1.010.970.981.011.031.02
0.45-SL2-LY1.070.930.951.030.980.99
0.45-SL3-LY0.960.990.991.001.011.00

Figure 12

SEM images of non-dispersible underwater concrete in a chloride environment for 28 days"

Figure 13

SEM images of non-dispersible underwater concrete in a chloride environment for 360 days"

Figure 14

XRD patterns of cement pastes in a chloride environment"

Table 12

Peak intensity of main phase of cement pastes at ages of 28 days and 360 days"

SampleAFt (9.12°)Friedel's salt (11.12°)CaSO4·2H2O (11.70°)Ca(OH)2 (18.15°)
28 days360 days28 days360 days28 days360 days28 days360 days
0.45-O-S3175762123192965741,9513,268
0.45-O-LY5695983274062612611,8242,004
0.45-SL3-LY3585489791,199302335452469

Figure 15

TG/DTG analysis of cement paste samples in a chloride environment for 180 days"

Figure 16

FT-IR analysis of cement paste samples in a chloride environment"

Figure 17

Influence of GGBS addition on compressive strength in a mixed environment"

Table 13

Deterioration resistance coefficient of non-dispersible underwater concrete in a mixed salt environment"

GroupsDeterioration resistance coefficient
7 days28 days56 days90 days180 days360 days
0.45-O-FY0.930.970.920.940.930.86
0.45-SL1-FY0.960.950.900.950.950.93
0.45-SL2-FY1.060.940.970.990.960.93
0.45-SL3-FY1.040.961.000.970.990.97

Figure 18

Compressive strength of non-dispersible underwater concrete in different corrosion environments"

Figure 19

SEM images of non-dispersible underwater concrete in a mixed environment for 28 days"

Figure 20

SEM images of non-dispersible underwater concrete in a mixed environment for 360 days"

Figure 21

XRD patterns of cement pastes in a mixed salt environment"

Table 14

Peak intensity of main phase of cement pastes at ages of 28 days and 360 days"

SampleAFt (9.12°)Friedel's salt (11.12°)CaSO4·2H2O (11.70°)Ca(OH)2 (18.15°)
28 days360 days28 days360 days28 days360 days28 days360 days
0.45-O-FY3686422993714034351,3221,614
0.45-SL3-FY464532780877365388506645

Figure 22

TG/DTG analysis of cement paste samples in a mixed salt environment for 180 days"

Figure 23

FT-IR analysis of non-dispersible underwater concrete in a mixed salt environment"

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