基于低场核磁共振的聚合物改性修补砂浆抗渗性研究

王衍升; 李召峰; 毕玉峰; 辛公锋; 杨耀辉

基于低场核磁共振的聚合物改性修补砂浆抗渗性研究

王衍升^{1, 3, 4},
李召峰^{1, 3, 4, ,},
毕玉峰²,
辛公锋²,
杨耀辉²

1.
山东大学　岩土与地下工程研究院, 济南 250061
2.
山东高速集团有限公司创新研究院, 济南 250014
3.
山东大学　隧道工程灾变防控与智能建养全国重点实验室, 济南 250014
4.
山东大学　齐鲁交通学院, 济南 250002

基金项目: 山东省重点研发计划(重大科技创新工程)(2021CXGC010301；2023ZLGX01) ；国家自然科学基金面上项目(52178338)；山东省竞争性创新平台项目(2023CXPT080)；国家重点研发计划(2022YFB2601903)

详细信息

通讯作者:
李召峰，博士，教授，博士生导师，研究方向为高性能交通复合修补材料　E-mail: lizf@sdu.edu.cn

中图分类号: TQ172.79；TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2024-07-05
- 修回日期: 2024-08-12
- 录用日期: 2024-08-29
- 网络出版日期: 2024-09-07

Study on impermeability of polymer modified repair mortar based on low field nuclear magnetic resonance technology

WANG Yansheng^{1, 3, 4},
LI Zhaofeng^{1, 3, 4
, ,},
BI Yufeng²,
XIN Gongfeng²,
YANG Yaohui²

1.
Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, China
2.
Shandong Hi-Speed Group Innovation Research Institute, Jinan 250014, China
3.
State Key Laboratory for Tunnel Engineering, Shandong University, Jinan 250014, China
4.
School of Qilu Transportation, Shandong University, Jinan 250002, China

Funds: Shandong Province Key R&D Program (Major Technological Innovation) (2021CXGC010301; 2023ZLGX01); the National Natural Science Foundation of China (52178338); the Competitive Innovation Platform Project of Shandong Province (2023CXPT080); National Key Research and Development Program (2022YFB2601903)

摘要

摘要: ： ¹H低场核磁共振是通过氢原子能量变化分析水的分布和含量，一种快速、有效、无损的测试技术。通过三轴¹H低场核磁共振获得了不同应力状态下可再分散乳胶粉(简称聚合物)改性修补砂浆中可蒸发水的横向弛豫时间(T₂)和渗水量，据此分析了砂浆的抗渗性，并通过孔结构与微观形貌揭示了聚合物对砂浆可蒸发水横向弛豫特征的影响机制。研究表明：渗透压是修补砂浆横向弛豫时间和渗水量的主要影响因素，聚合物降低了不同渗透压下修补砂浆毛细孔和凝胶孔水的含量，6 MPa时渗水量降低57.3%，显著提升了修补砂浆的抗渗性能；聚合物提高了修补砂浆的韧性，三轴荷载作用下砂浆由交叉裂缝破坏变为压缩破坏，避免了砂浆在轴压作用下产生的抗渗性能突破。聚合物膜的阻隔和填充作用使砂浆孔隙率降低了3.28%，减弱了凝胶孔和毛细孔中的传输能力，从而降低了修补砂浆的横向弛豫强度和渗水量，提高了其抗渗性能。相较于传统的抗渗性检测方法，¹H低场核磁共振可以表征水分的渗透过程，是一种切实可行的抗渗性检测方法。
- 低场核磁共振 /
- 横向弛豫时间 /
- 渗水量 /
- 聚合物 /
- 修补砂浆 /
- 抗渗性
Abstract: Low field ¹H-nuclear magnetic resonance (NMR) is a quick, effective and nondestructive measuring technique to investigate the distribution and content of water by H-atom energy changes. Transverse relaxation time (T₂) and seepage amount of redispersible polymer powder (polymer)-modified repair mortars were obtained by triaxial low field ¹H-NMR, that was wont to analyze the permeability of the repair mortars. The mechanism of polymer influence on the transverse relaxation characteristics of repair mortars was explained by pore structure and micromorphology analysis. It’s shown that: Osmotic pressure is the main factor affecting the transverse relaxation time and seepage amount of mortar. Polymer reduces the water content in capillary and gel pores of repair mortar under different osmotic pressures, and the water seepage decreases by 57.3% at 6MPa, which significantly improves the impermeability of repair mortar. The polymer improves the toughness of the repair mortar, which makes the cross-cracking damage of mortar change into compression deterioration under three-axis loading conditions, thus avoiding the breakthrough of impermeability of the mortar under axial compression. The blocking and filling effect of polymer film reduces the porosity of mortar by 3.28%, and weakens the transmission ability in gel pores and capillary pores. Therefore, the transverse relaxation strength and water seepage of repair mortar are reduced, enhancing its impermeability. Compared with the traditional impermeability testing methods, low field ¹H-NMR can characterize the water infiltration process and the seepage amount at different osmotic pressures, which is a practical impermeability testing method.
- low field NMR /
- transverse relaxation time /
- seepage amount /
- polymer /
- repair mortar /
- impermeability

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图 1 可再分散乳胶粉

Figure 1. Redispersible polymer powder

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图 2 修补砂浆试块三轴压缩示意图

Figure 2. Triaxial compression diagram of repair mortar

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图 3 聚合物和测试试样横向弛豫分布对比

Figure 3. Comparison of transverse relaxation distribution between polymer and test sample

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图 4 聚合物掺量对修补砂浆力学性能的影响

Figure 4. Influence of polymer content on mechanical properties of repairing mortar

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图 5 不同渗透时间修补砂浆横向弛豫时间分布

Figure 5. Transverse relaxation time distribution of repaired mortar at different penetration time

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图 6 不同渗透压修补砂浆横向弛豫时间分布

Figure 6. Transverse relaxation time distribution of repaired mortar at different penetration pressure

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图 7 不同轴压修补砂浆横向弛豫时间分布

Figure 7. Transverse relaxation time distribution of repaired mortar under different coaxial pressures

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图 8 三轴试验试样的破坏形貌(a)K0;(b)K9

Figure 8. Failure morphology of triaxial test samples(a)K0;(b)K9

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图 9 聚合物掺量对修补砂浆孔结构的影响

Figure 9. Influence of polymer content on pore structure of repair mortar

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图 10 不同聚合物掺量修补砂浆的断面SEM图像

Figure 10. Cross-section SEM images of repair mortar with different polymer contents

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图 11 修补砂浆的断面EDS面扫图图谱和元素分布

Figure 11. Sectional EDS scan map and element distribution of the repair mortar

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表 1 水泥的化学组成

Table 1. Chemical compositions of cement

SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	Na₂O	f-CaO	Loss
20.6	4.57	3.29	63.27	2.59	2.11	0.55	0.76	2.15

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表 2 水泥物理力学性能

Table 2. Physical and mechanical properties of cement

Setting time/min		Flexural strength/MPa			Compressive strength/MPa
Initial set	Final set	3 d	7 d	28 d	3 d	7 d	28 d
128	196	5.3	6.4	8.5	26	35.9	45.6

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表 3 聚合物改性修补砂浆配合比

Table 3. Mix proportion of polymer modified repair mortar

Specimen No.	Cement/g	Sand/g	Superplasticizer/g	Defoamer/g	Water/g	Polymer/g
K0	100	200	0.2	0.5	35	0
K3	100	200	0.2	0.5	35	3
K6	100	200	0.2	0.5	35	6
K9	100	200	0.2	0.5	35	9
K12	100	200	0.2	0.5	35	12
K15	100	200	0.2	0.5	35	15

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表 4 不同渗透时间修补砂浆渗水量

Table 4. Seepage amount of repaired mortar at different times

	5 min	10 min	15 min	20 min	25 min	30 min
K0	0.4%	0.71%	1.02%	1.29%	1.54%	1.72%
K9	0.05%	0.13%	0.18%	0.22%	0.24%	0.27%

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表 5 不同渗透压修补砂浆渗水量

Table 5. Seepage amount of repaired mortar at different infiltration times

	1 MPa	2 MPa	3 MPa	4 MPa	5 MPa	6 MPa
K0	1.59%	3.1%	3.9%	4.26%	4.68%	5.34%
K9	0.57%	0.97%	1.48%	1.79%	2.02%	2.28%

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表 6 不同轴压修补砂浆渗水量

Table 6. Seepage amount of repairing mortar under different coaxial pressure

	20 MPa	30 MPa	40 MPa	50 MPa
K0	0.03%	−0.03%	−0.11%	−0.38%
K9	−0.08%	−0.13%	−0.12%	−0.03%

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表 7 聚合物掺量对修补砂浆孔隙率的影响

Table 7. Influence of polymer content on porosity of repair mortar

	K0	K3	K6	K9	K12	K15
Porosity/%	10.73	9.25	8.53	7.45	8.49	9.84

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