垃圾焚烧渣机械活化改性高强度混凝土的水化特性及耐久性研究

doi:10.19964/j.issn.1006-4990.2024-0028

Abstract

Abstract:

High strength concrete products were prepared with mechanically activated incineration slag as modified additive.The effect of activation time on the structure of waste slag was studied，and the hydration mechanism of activated waste slag modified concrete products was explored.Besides，the chloride ion diffusion coefficient and sulfate corrosion resistance of the samples were evaluated.The results showed that prolonging the activation time could stimulate the volcanic ash activity by refining the particle size of the waste slag and destroying the crystal structure of the mineral.In the alkaline hydration environment，calcium silicate hydrate and calcium aluminate hydrate was generated between the reaction of the dissolved active aluminum silicate and calcium hydroxide，thus refining the pore size and improving SO₄^2-and Cl^-corrosion resistance.The 28 d compressive strength of concrete products modified with 4 h activation incineration slag was greater than 80 MPa，meeting the requirements of grade C50~C80 in the CECS 104—1999 “technical specification for high strength concrete structures”.Meanwhile，the chloride ion diffusion coefficient reached 4.57×10^-12 m²/s，and sulfate resistance of concrete met the critical value in the GB/T 50476—2019“durability design standards for concrete structures”.Consequently，the research results provided new ideas for the efficient utilization of waste incineration residue.

Key words: waste incineration slag, high strength concrete, mechanical activation, composition and microstructure

CLC Number:

TQ127.2

BI Chao, ZHANG Xiaokang, WANG Xiugui. Study on hydration characteristics and durability of high-strength concrete modified by mechanically activated waste incineration slag[J]. Inorganic Chemicals Industry, 2024, 56(12): 142-149.

Figures/Tables 17

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References 14

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原料	w （SiO₂）/%	w （Al₂O₃）/%	w （CaO）/%	w （MgO）/%	w （Fe₂O₃）/%
垃圾焚烧渣	50.22	10.53	25.09	2.09	2.64
水泥	20.88	3.95	60.23	1.89	3.03
原料	w （FeO）/%	w （Na₂O）/%	w （K₂O）/%	w （SO₃）/%	烧失量
垃圾焚烧渣	1.69	1.36	4.69	0.36	1.33
水泥	0.64			0.52	8.86

粒度范围/mm	质量分数/%	粒度范围/mm	质量分数/%
<0.03	10.06	0.60~<1.18	40.09
0.03~<0.07	10.95	1.18~<4.75	8.64
0.07~<0.60	30.26

活化时间/h	w（粒径< 10 µm）/%	D₅₀/µm	D₉₀/µm	比表面积/ （m²·kg^-1）
0	5.28	62.88	956.18	43.56
1	20.59	40.03	145.22	230.17
2	39.86	20.31	72.38	392.69
3	52.81	15.87	60.02	549.43
4	70.26	8.26	28.94	728.96

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on hydration characteristics and durability of high-strength concrete modified by mechanically activated waste incineration slag

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