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. 2022 Aug 3;15(15):5352.
doi: 10.3390/ma15155352.

Study on SO42-/Cl- Erosion Resistance and Mechanism of Recycled Concrete Containing Municipal Solid Waste Incineration (MSWI) Powder

Yun Dong  1 , Yuanshan Ma  1   2 , Ningbo Peng  1 , Jianchun Qiu  3
Affiliations

Study on SO42-/Cl- Erosion Resistance and Mechanism of Recycled Concrete Containing Municipal Solid Waste Incineration (MSWI) Powder

Yun Dong et al. Materials (Basel). .

Abstract

In this paper, the strength characteristics and erosion resistance of solid waste incineration (MSWI) powder were studied. Firstly, the optimum process for the preparation of regenerated powder from MSWI bottom slag by ball milling was determined as follows: rotational speed 350 r/min, time 45 min. The strength activity index of regenerated powder reached the maximum when the substitute content of powder was 30%. Secondly, the semi-erosion method was used to study the strength variation rule of mortar with different content of MSWI powder in semi-immersion of salt solution. It was found that the higher the content of MSWI powder, the greater the anti-erosion coefficient of mortar specimen. Finally, the capillary rise test, crystallization test and capillary pore water absorption test were used to study the total porosity, coarse capillary-pore porosity and fine-capillary pore porosity of concrete containing MSWI powder. The results showed that, with the increase in MSWI powder content, the above pore structure properties were improved. The results revealed the transport and crystallization process of salt solution in concrete mixed with MSWI powder and the mechanism of corrosion resistance.

Keywords: capillary migration parameters; municipal solid waste incineration (MSWI) powder; salt solution erosion; strength activity.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Bottom ash samples after (a) and before drying (b).
Figure 2
Figure 2
Gradation curve of MSWI powder.
Figure 3
Figure 3
Diagrams of semi-immersion test (a) and compressive strength test (b).
Figure 4
Figure 4
Schematic diagram of crystallization experiment.
Figure 5
Figure 5
Capillary water absorption experiment of MSWI recycled concrete.
Figure 6
Figure 6
Screen residual rate of 80-mesh (a) and specific surface (b) versus different rotating speeds of MSWI mortar.
Figure 7
Figure 7
Mortars specimen morphology under semi-immersion erosion. (a) one month, (b) three months, (c) six months, (d) removed the crystallization.
Figure 8
Figure 8
Mass loss rate of specimens soaked in water (a) and sodium sulfate solution (b).
Figure 9
Figure 9
Compressive (a) and flexural (b) corrosion resistance coefficients of MSWI mortars under sodium sulfate semi-immersion condition.
Figure 10
Figure 10
Compressive (a) and flexural (b) corrosion resistance coefficients of MSWI mortars under sodium chloride semi-immersion condition.
Figure 11
Figure 11
Chloride ion chemical bonding amount of MSWI recycled cement-based material at different dosage (a) and age (b).
Figure 12
Figure 12
Chloride ion physical bonding amount of MSWI recycled cement-based material at different dosage (a) and age (b).
Figure 13
Figure 13
Total chloride ion bonding of MSWI recycled cement-based material at different dosage (a) and age (b).
Figure 14
Figure 14
Porosity of recycled concrete at different MSWI content.
Figure 15
Figure 15
Diagrams of capillary rise height (a) versus soaking time, crude porosity (b) and system porosity (c).
Figure 16
Figure 16
Diagrams of crystallization rate versus MSWI content (a), coarse porosity (b) and fine porosity (c).
Figure 17
Figure 17
Diagrams of sodium sulfate absorption quality versus coarse (a) and fine porosity (b).
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