花岗岩石粉对机制砂混凝土基本性能及气体渗透特性的影响

周翱翔; 张云升; 钱如胜; 苗改霞; 薛翠真; 张宇; 乔宏霞

花岗岩石粉对机制砂混凝土基本性能及气体渗透特性的影响

1.
兰州理工大学　土木工程学院, 兰州 730050
2.
浙江工业大学　建筑工程学院, 杭州 310014

基金项目: 国家自然科学基金 (U21A20150); 浙江省属高校基本科研业务费专项资金资助(RF-A2023015)

详细信息

通讯作者:
张云升，博士，教授，博士生导师，研究方向为土木工程材料　E-mail: zhangyunsheng2011@163.com

中图分类号: TU528
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- 文章访问数: 129
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- 被引次数: 0
出版历程
- 收稿日期: 2023-10-17
- 修回日期: 2023-11-06
- 录用日期: 2023-11-25
- 网络出版日期: 2023-12-12
- 刊出日期: 2024-07-15

Influence of granite stone powder on the basic properties and gas permeability characteristics of mechanism sand concrete

1.
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2.
College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China

Funds: National Natural Science Foundation of China (U21A20150); Zhejiang Provincial Universities Fundamental Scientific Research Funds Special Fund Support (RF-A2023015)

摘要

摘要: 采用花岗岩石粉等质量(0%~32%)替代部分水泥制备机制砂混凝土，应用等温量热、压汞、准稳态气体渗透等方法测试机制砂混凝土的水泥水化热、孔隙结构、力学强度及气体渗透性能，结合灰色关联分析建立不同龄期(28~130 d)石粉-机制砂混凝土气体渗透特性与孔隙特征之间关系。结果表明：机制砂混凝土中掺入适量石粉可减缓水化放热、改善孔隙结构、提高抗压强度及降低气体渗透系数；8%石粉掺量机制砂混凝土的抗压强度最高、气体渗透系数最低，其灰色关联分析表明有效孔隙率和小于100 nm孔隙对气体渗透性影响最显著。
- 花岗岩石粉 /
- 机制砂混凝土 /
- 孔隙特征 /
- 气体渗透性 /
- 灰色关联分析
Abstract: Granite powder (0%-32%) was used to replace part of cement clinker to prepare machine-made sand concrete. The Isothermal Calorimetry, Mercury Intrusion Porosimetry as well as Gas Penetration testing-methods were employed to measure the hydration heat, pore structure, mechanical strength and gas permeability of the concrete. Combined with the gray-correlation analysis method, the relationship between gas permeability properties and pore-structure characteristics was established for concrete at various curing ages (28-130 d). The results show that appropriate granite powder added can slow down the hydration heat release rate, refine pore structure, increase compressive strength, and reduce gas permeability. The compressive strength value of the concrete with 8% granite powder is the highest while its gas permeability coefficient reaches the lowest. The gray-correlation analysis shows that the effective porosity and the pore with the size less than 100 nm play the most significant impact on gas permeability.
- granite powder /
- machine-made sand concrete /
- pore-structure /
- gas permeability /
- gray correlation analysis

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图 1 水泥、粉煤灰和石粉粒径分布

Figure 1. Particle size distribution of cement, fly ash and stone powder

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图 2 水泥、粉煤灰和石粉XRD图谱

Figure 2. XRD patterns of cement, fly ash and stone powder

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图 3 气体渗透试样制作流程图：(a) 钻芯取样；(b) 两端去段；(c) 干燥；(d) 样品成品

Figure 3. Flow chart of gas permeation specimen production: (a) Core drilling; (b) Segmentation at both ends; (c) Drying; (d) Finished samples

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图 4 气体渗透装置

Figure 4. Gas permeation device

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图 5 气体渗透率原理

Figure 5. Principles of gas permeability

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图 6 不同石粉掺量净浆的水化热

Figure 6. Hydration heat of the paste with various granite powder replacements

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图 7 不同龄期掺石粉机制砂混凝土的孔径分布、最可几孔径及孔隙率

Figure 7. Pore size distribution, Optimal pore size and porosity of granite powder mechanized sand concrete with various curing ages

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图 8 不同龄期掺石粉的机制砂混凝土抗压强度

Figure 8. Concrete compressive strength of granite powder mechanized sand concrete with various curing ages

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图 9 不同龄期掺石粉的机制砂混凝土气体渗透系数

Figure 9. Gas permeability coefficient of granite powder mechanized sand concrete with various curing ages

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表 1 水泥、粉煤灰和石粉化学组成

Table 1. Chemical composition of cement, fly ash, and stone powder

Chemical components /%	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	Na₂O	K₂O
Cement	26.15	7.87	3.81	53.85	2.01	3.88	0.63	1.00
Fly ash	52.63	29.47	5.42	4.79	1.52	0.86	1.73	1.70
Granite powder	16.18	5.40	2.44	48.19	25.51	0.21	0.51	0.68

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表 2 机制砂混凝土配合比

Table 2. Machine-made sand concrete mix

Number	Water-to-binder ratio	Cementing material/(kg·m⁻³)			Machine-made sand/(kg·m⁻³)	Coarse aggregate/ (kg·m⁻³)	Water reducing agent/%
Number	Water-to-binder ratio	Cement	Fly ash	Granite powder	Machine-made sand/(kg·m⁻³)	Coarse aggregate/ (kg·m⁻³)	Water reducing agent/%
S0	0.38	320	101	0	804	1066	1.00
S8		286		34			1.00
S16		253		67			1.00
S24		219		101			2.20
S32		185		135			2.80

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表 3 水化特征点出现时间(h)

Table 3. Time of occurrence of hydration feature points (h)

Phase	No.
Phase	S0	S8	S16	S24	S32
Start of the acceleration period	2.33	2.65	3.02	2.9	2.63
Time of appearance of the first wave	11.86	12.09	12.18	11.91	15.27
Time of appearance of the second wave	16.41	16.03	16.08	16.03	15.8

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表 4 S8气体渗透系数与孔结构数据

Table 4. S8 gas permeability coefficient and pore structure data

Time/d	Gas permeability coefficient /(×10⁻¹⁷m²)	Poriness/%	Specific surface area /(m²·g⁻¹)	Effective porosity/%	Pore tortuosity	Aperture size/(mL·g⁻¹)
Time/d	Gas permeability coefficient /(×10⁻¹⁷m²)	Poriness/%	Specific surface area /(m²·g⁻¹)	Effective porosity/%	Pore tortuosity	Gel pore	Small pore	Macropore	Air hole
28	0.48	9.90	13.44	4.42	4.94	0.20	0.39	0.03	0.01
60	0.39	9.66	14.11	2.98	6.78	0.23	0.28	0.03	0.02
130	0.18	9.56	12.94	2.45	7.69	0.20	0.27	0.02	0.05

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表 5 S8气体渗透系数与孔结构灰色关联分析

Table 5. Gray relational analysis of gas permeability coefficient and pore structure

Number	Poriness	Specific surface area	Effective porosity	Pore tortuosity	Aperture size
Number	Poriness	Specific surface area	Effective porosity	Pore tortuosity	Gel pore	Small pore	Macropore	Air hole
S8	+0.906	+0.896	+0.954	-0.813	+0.883	+0.943	+0.877	+0.698

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