风积沙与再生复合微粉对超高性能混凝土力学性能的影响

刘超; 林鑫; 刘化威; 胡天峰

风积沙与再生复合微粉对超高性能混凝土力学性能的影响

刘超^{1, 2, ,},
林鑫¹,
刘化威²,
胡天峰²

1.
西安建筑科技大学　理学院, 西安 710055
2.
西安建筑科技大学　土木工程学院, 西安 710055

基金项目: 国家自然科学基金(52178251；51878546)；陕西省杰出青年科学基金项目(2020JC-46)；陕西省重点研发计划项目(2018ZDCXL-SF-03-03-02；2020SF-367)；陕西省科技创新基地(2017KTPT-19)

详细信息

通讯作者:
刘超，博士，教授，博士生导师，研究方向为建筑固废资源化与智能建造技术　E-mail: chaoliu@xauat.edu.cn

中图分类号: TU528.041
计量
- 文章访问数: 92
- HTML全文浏览量: 51
- 被引次数: 0
出版历程
- 收稿日期: 2021-09-28
- 录用日期: 2021-11-16
- 修回日期: 2021-11-02
- 网络出版日期: 2021-12-07

Effect of aeolian sand and recycled composite micro-powder on mechanical properties of ultra-high performance concrete

Chao LIU^{1, 2
, ,},
Xin LIN¹,
Huawei LIU²,
Tianfeng HU²

1.
School of Science, Xi’an University of Architecture and Technology, Xi’an 710055, China
2.
School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

摘要

摘要: 以废弃砖和混凝土制成再生复合微粉部分取代水泥作为辅助胶凝材料，以风积沙部分取代河砂协同制备超高性能混凝土(Ultra-high performance concrete，UHPC)，采用修正的Andreasen-Andersen(MAA)颗粒堆积模型设计配合比。建立了考虑风积沙和再生复合微粉火山灰活性的抗压强度增长预测模型。研究了风积沙和复合微粉对UHPC力学性能的影响。结果表明：风积沙等质量取代河砂的取代率为30%、复合微粉等质量取代水泥的取代率为10%时，UHPC力学性能最优。颗粒材料的粒径分布最佳，形成了较高密实度的基体。同时，风积沙和复合微粉活性成分的水化贡献改善了UHPC的微观结构，进而提高其力学性能。
- 超高性能混凝土 /
- 风积沙 /
- 再生复合微粉 /
- 力学性能 /
- 微观结构
Abstract: Ultra-high performance concrete (UHPC) was prepared by partially replacing cement with recycled composite micronized powder. The waste bricks and concrete were used as an auxiliary cementitious material. The river sand was partially replaced with anthracitic sand. The modified Andreasen-Andersen (MAA) particle accumulation model was used to design the proportions. A concrete strength growth prediction model considering the pozzolanic activity of aeolian sands and composite micro-powder was built. The effect mechanism of composite micro-powder and aeolian sand on the mechanical property of UHPC was studied. The results show that the mechanical properties of UHPC are optimal when the replacement rate of river sand by the equivalent mass of aeolian sand is 30% and the replacement rate of cement by the equivalent mass of composite micro-powder is 10%. The particle size distribution of granular materials is the best, forming a matrix with high compactness. At the same time, the hydration contribution of aeolian sand and composite micro-powder active components improves the microstructure and mechanical properties of UHPC.
- ultra-high performance concrete /
- aeolian sand /
- composite micro-powder /
- mechanical property /
- microstructure

HTML全文

图 1 粉体材料的频率分布

Figure 1. Frequency distribution of powder materials

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图 2 拟合结果与理论粒径曲线的匹配

Figure 2. Curve matching

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图 3 AS和CMP掺量对UHPC工作性能的影响

Figure 3. Effect of AS and CMP replacement ratios on UHPC workability

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图 4 AS和CMP掺量对UHPC抗压强度的影响

Figure 4. Effect of AS and CMP replacement ratios on the compressive strength of UHPC

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图 5 UHPC细骨料空隙率

Figure 5. Fine aggregate void fraction of UHPC

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图 6 AS和CMP掺量对UHPC劈裂抗拉强度的影响

Figure 6. Effect of AS and CMP replacement ratios on the splitting tensile strength of UHPC

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图 7 式(1)计算结果与试验结果对比

Figure 7. Comparison of Eq. (1) with measured results

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图 8 VFP和CMP参与水化反应过程

Figure 8. VFP and CMP participate in the hydration reaction process

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图 9 不同风积沙和复合微粉取代率下UHPC的XRD图谱

Figure 9. XRD patterns of UHPC with different substitution rates of AS and CMP

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图 10 风积沙和复合微粉取代率对UHPC微观结构的影响：

Figure 10. Effect of AS and CMP substitution rate on microstructure of UHPC: (a)-(b) is CMP0AS0; (c)-(d) is CMP10AS30; (e)-(f) is CMP20AS45

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表 1 UHPC配合比

Table 1. Mix proportions of UHPC

Code	Mix	Binder compositions/(kg·m⁻³)					Water/ (kg·m⁻³)	Superplasticizer/ (kg·m⁻³)	Steel fiber/%	River sand / (kg·m⁻³)	Aeolian sand / (kg·m⁻³)
Code	Mix	Cement	Brick powder	Concrete powder	Silica Fume	Ultrafine Fly Ash	Water/ (kg·m⁻³)	Superplasticizer/ (kg·m⁻³)	Steel fiber/%	River sand / (kg·m⁻³)	Aeolian sand / (kg·m⁻³)
1	CMP0AS0	595	0	0	85	170	136	21.25	2.5	850	0
2	CMP10AS0	510	51	34	85	170				850	0
3	CMP20AS0	425	102	68	85	170				850	0
4	CMP0AS15	595	0	0	85	170				722.5	127.5
5	CMP10AS15	510	51	34	85	170				722.5	127.5
6	CMP20AS15	425	102	68	85	170				722.5	127.5
7	CMP0AS30	595	0	0	85	170				590	225
8	CMP10AS30	510	51	34	85	170				590	225
9	CMP20AS30	425	102	68	85	170				590	225
10	CMP0AS45	595	0	0	85	170				467.5	382.5
11	CMP10AS45	510	51	34	85	170				467.5	382.5
12	CMP20AS45	425	102	68	85	170				467.5	382.5

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表 2 不同UHPC试件的风积沙与水泥掺量比值(S/C)和复合微粉掺量与胶凝材料总量比值(C_c/C₀)

Table 2. The ratio of aeolian sand content to cement content (S/C) and composite micro-powder content to total cementitious material (C_c/C₀) values of different UHPC specimens

Code	1	2	3	4	5	6	7	8	9	10	11	12
S/C	0	0	0	0.21	0.25	0.3	0.38	0.44	0.53	0.63	0.75	0.9
C_c/C₀	0	0.1	0.2	0	0.1	0.2	0	0.1	0.2	0	0.1	0.2

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