动静加载下微硅粉-橡胶/水泥砂浆的力学性能

张金松; 唐雨轮; 占佳佳; 庞建勇

动静加载下微硅粉-橡胶/水泥砂浆的力学性能

安徽理工大学　土木建筑学院, 淮南 232001

基金项目: 安徽省高校自然科学研究项目(2023AH051219)；矿山建设工程安徽省高校重点实验室基金(GXZDSYS2022102)

详细信息

通讯作者:
张金松，博士，硕士生导师，研究方向为水泥混凝土材料　E-mail：zjswhy890723@126.com

计量
- 文章访问数: 55
- HTML全文浏览量: 22
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-31
- 修回日期: 2023-12-06
- 录用日期: 2023-12-26
- 网络出版日期: 2024-01-29

Mechanical properties of micro silicon powder -rubber/cement mortar under dynamic and static loading

School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China

Funds: Natural Science Research Project of Universities in Anhui (2023AH051219); Anhui Key Laboratory of Mining Construction Engineering (GXZDSYS2022102)

摘要

摘要: 为研究微硅粉(Micro silicon powder, MP)-橡胶/水泥砂浆的力学性能，试验设计了16组试件，通过单轴抗压试验与抗冲击试验(SHPB)分析不同微硅粉掺量、橡胶粒径和养护龄期试件的峰值应力、峰值应变、弹性模量，抗冲击强度、破坏形态与应力-应变曲线。单轴抗压试验表明：在相同的养护龄期下，橡胶颗粒的加入使得砂浆试件的抗压强度与弹性模量降低，峰值应变增加，加入微硅粉后试件的强度与弹性模量会有所回升。抗冲击试验表明：橡胶会降低砂浆的抗冲击强度，但能改善砂浆的破坏形态，而微硅粉不仅能增强这种改善作用，还能提升橡胶/水泥砂浆的抗冲击强度，另外加入微硅粉后，试件的应力-应变曲线的峰值荷载会因为其弹性变形与弹塑性变形阶段的缩短而向左偏移，但破坏阶段明显延长。
- 微硅粉-橡胶/水泥砂浆 /
- 橡胶掺量 /
- 微硅粉掺量 /
- 分离式霍普金森压杆(SHPB) /
- 单轴抗压
Abstract: In order to study the mechanical properties of micro silicon powder (MP)-rubber/cement mortar, 16 sets of specimens were designed and analyzed by uniaxial compression test and impact test (SHPB) for peak stress, peak strain, modulus of elasticity, impact strength, damage morphology and stress-strain curves of the specimens with different micro silicon powder dosage, rubber particle sizes and curing ages. The uniaxial compressive test shows that the addition of rubber particles decreases the compressive strength and modulus of elasticity of mortar specimens and increases the peak strain at the same age of maintenance, and the strength and modulus of elasticity of the specimens recover after the addition of micro silica powder. The impact resistance test shows that: rubber will reduce the impact strength of mortar, but can improve the damage morphology of mortar, and micro silica powder not only enhances this improvement, but also improves the impact strength of rubber/cement mortar, in addition, after the addition of micro silica powder, the peak load of the stress-strain curve of the specimen will be shifted to the left due to the shortening of the elastic deformation and elasto-plastic deformation stages, but the damage stage is obviously prolonged.
- micro silica powder-rubber/cement mortar /
- rubber dosing /
- micro silica powder dosage /
- separate Hopkinson pressure bar (SHPB) /
- uniaxial compression resistance

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图 1 SHPB试验装置图

Figure 1. Testing apparatus of SHPB

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图 2 橡胶/水泥砂浆试件峰值应力

Figure 2. Peak stress in rubber/cement mortar specimens

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图 3 MP-橡胶/水泥砂浆试件峰值应力

Figure 3. Peak stress of MP-rubber/cement mortar specimens

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图 4 橡胶/水泥砂浆试件峰值应变

Figure 4. Peak strain of rubber/cement mortar specimen

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图 5 MP-橡胶/水泥砂浆试件峰值应变

Figure 5. Peak strain of MP-rubber/cement mortar specimen

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图 6 橡胶/水泥砂浆试件弹性模量

Figure 6. Modulus of elasticity of rubber/cement mortar specimens

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图 7 MP-橡胶/水泥砂浆试件弹性模量

Figure 7. Modulus of elasticity of MP-rubber/cement mortar specimens

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图 8 MP-橡胶/水泥砂浆试件动态压缩强度

Figure 8. MP-Rubber/cement mortar specimen dynamic compression strength

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图 9 MP-橡胶/水泥砂浆试件应力应变曲线

Figure 9. MP-Rubber/cement mortar specimen stress-strain curve

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图 10 MP-橡胶/水泥砂浆试件冲击破坏形态

Figure 10. MP-Rubber/cement mortar specimen impact damage morphology

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表 1 微硅粉性能参数

Table 1. Performance index of micro silicon powder

Sample status	The specific surface area/(m²·g⁻¹)	SiO₂/%	Cl⁻/%	Reduce the amount of burning/%
White powder	21	98.4	0.01	1.48

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表 2 试验橡胶水泥砂浆配合比

Table 2. Mixture of rubber cement mortar

Specimen	Cement mortar material dosage/(kg·m⁻³)
Specimen	Cement	Water	Sand	Rubber	Micro silicon powder
OM	450	280	1080	0	0
R20-0%MP/C	450	280	864	62	0
R20-2%MP/C	441	280	864	62	9
R20-4%MP/C	432	280	864	62	18
R20-6%MP/C	423	280	864	62	27
R20-8%MP/C	414	280	864	62	36
R40-0%MP/C	450	280	864	62	0
R40-2%MP/C	441	280	864	62	9
R40-4%MP/C	432	280	864	62	18
R40-6%MP/C	423	280	864	62	27
R40-8%MP/C	414	280	864	62	36
R60-0%MP/C	450	280	864	62	0
R60-2%MP/C	441	280	864	62	9
R60-4%MP/C	432	280	864	62	18
R60-6%MP/C	423	280	864	62	27
R60-8%MP/C	450	280	864	62	36
Notes: OM is the blank group, R20, R40 and R60 are the R rubber mesh, indicating that the mesh of the blended rubber powder is 20 mesh, 40 mesh and 60 mesh, respectively, and n%MP/C is the percentage of blended microsilica powder, indicating that the blended micro silico powder accounts for 0%, 2%, 4%, 6%, and 8% of the mass of the cement, respectively.

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