内掺硅烷对硫铝酸盐水泥砂浆力学和吸水性能的影响

薛善彬; 王丹; 马金元; 白如飞; 郭哲名; 高小建

内掺硅烷对硫铝酸盐水泥砂浆力学和吸水性能的影响

1.
青岛理工大学　土木工程学院, 青岛 266525
2.
哈尔滨工业大学　土木工程学院, 哈尔滨 150001

基金项目: 国家自然科学基金(U2106220；52008222)；青岛市科技惠民示范专项(24-1-8-cspz-9-nsh)

详细信息

通讯作者:
薛善彬，博士，副教授，博士生导师，研究方向为混凝土耐久性　E-mail: xueshanbin@qut.edu.cn

中图分类号: TU528
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- 文章访问数: 20
- HTML全文浏览量: 12
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-30
- 修回日期: 2024-10-14
- 录用日期: 2024-10-19
- 网络出版日期: 2024-11-02

Effects of incorporated silane on mechanical and water absorption properties of sulphoaluminate cement mortar

1.
School of Civil Engineering, Qingdao University of Technology, Qingdao 266525, China
2.
School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China

Funds: National Natural Science Foundation of China (U2106220; 52008222); Demonstration Project of Benefiting People with Science and Technology of Qingdao, China (24-1-8-cspz-9-nsh)

摘要

摘要: 通过内掺硅烷对硫铝酸盐水泥(Sulphoaluminate cement，SAC)砂浆进行疏水改性，以提升其在海洋等严酷环境中的耐久性。首先，分析了内掺不同量硅烷SAC净浆的凝结时间和水化放热行为，系统研究了硅烷掺量对不同龄期SAC砂浆力学和吸水性能的影响规律。之后，基于压汞法、扫描电镜、X射线衍射法和材料表面水分接触角等测试结果探讨了内掺硅烷SAC砂浆力学与吸水性能的演化机理。最后，研究了不同硅烷掺量SAC砂浆与不同含水饱和度旧砂浆基体间界面剪切强度的演化规律。结果表明：掺入不同量硅烷的SAC净浆仍具备速凝特征，其快速放热阶段均集中于加水拌合后的2 h内。内掺水泥质量0.5%~2%的硅烷会对SAC砂浆的抗压强度产生一定的负面影响，但会略微提升其28 d龄期时的抗折强度。1~28 d龄期内，内掺硅烷SAC砂浆试件的毛细吸水系数相较未掺试件降低了71.0%~94.2%。内掺硅烷未造成SAC砂浆孔隙率的显著增长，但使直径大于50 nm的毛细孔体积分数升高以及水化产物含量有所增加。SAC砂浆中硅烷掺量的增加导致其表面水分接触角增大，并进一步降低了其毛细吸水性能。3 d龄期时，SAC砂浆与基体间的界面剪切强度随硅烷掺量的增加而升高，随基体饱和度的增加而降低。与不同饱和度基体粘结后，内掺硅烷SAC砂浆仍具有较低的吸水性能。
- 硫铝酸盐水泥 /
- 硅烷改性 /
- 毛细吸水 /
- 界面剪切强度 /
- 微观机理
Abstract: In this paper, the hydrophobic modification of sulphoaluminate cement (SAC) mortar was carried out by adding silane to improve its durability in harsh environments such as the ocean. Firstly, the setting time and hydration exothermic behavior of SAC paste with different saturation of silane were analyzed, and the influence of silane content on the mechanical and water absorption properties of SAC mortar at different ages was systematically investigated. The mechanical and water absorption evolution mechanism of silane-doped SAC mortar was further discussed based on the results of Mercury Intrusion Porosimetry, scanning electron microscope, X-ray diffraction and surface moisture contact angle tests. Finally, the evolution law of interface shear strength between SAC mortar with different silane contents and old mortar substrates with different water saturation was investigated. The results show that the SAC pastes with different silane contents still possess quick-setting characteristics, and its rapid exothermic stage is concentrated within 2 hours after water mixing. The incorporation of silane (0.5%~2% of cement in mass) has a certain negative effect on the compressive strength of SAC mortar, but can improve its flexural strength at the age of 28 d. The capillary water absorption coefficients of SAC mortar specimens incorporated with silane are reduced by 71.0%~94.2% compared with specimens without silane at the age of 1~28 d. The incorporation of silane does not cause a significant increase in the porosity of SAC mortar, but increases the volume fraction of capillary pores with a diameter greater than 50 nm and the content of hydration products. The increase of silane content in SAC mortar leads to the increase of its surface water contact angle and further reduces its capillary water absorption properties. At the age of 3d, the interface shear strength between SAC mortar and substrates increases with the increase of silane content, and decreases with the increase of the saturation of substrates. The SAC mortar with silane still have low water absorption properties after bonding to substrates with different saturation.
- sulphoaluminate cement /
- silane modification /
- capillary water absorption /
- interface shear strength /
- micro mechanism

HTML全文

图 1 界面剪切强度测试

Figure 1. Interface shear strength test

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图 2 不同硅烷掺量对SAC净浆的凝结时间的影响

Figure 2. Effects of different silane content on the setting time of sulphoaluminate cement (SAC) paste

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图 3 不同硅烷掺量对SAC净浆水化放热的影响

Figure 3. Effects of different silane content on the hydration heat of SAC paste

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图 4 SAC砂浆抗压与抗折强度随硅烷掺量和龄期的演化规律

Figure 4. The evolution of the compressive and flexural strength of SAC mortar with silane content and ages

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图 5 不同硅烷掺量SAC砂浆试件的吸水数据

Figure 5. Water absorption data of SAC mortar with different silane contents

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图 6 不同硅烷掺量SAC砂浆1 d和3 d龄期孔隙率

Figure 6. Porosity of SAC mortar with different silane contents at the age of 1 d and 3 d

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图 7 不同硅烷掺量SAC砂浆1 d和3 d龄期的孔径分布曲线

Figure 7. Pore size distribution curves of SAC mortar with different silane contents at the age of 1 d and 3 d

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图 8 不同硅烷掺量SAC砂浆1 d和3 d龄期的孔隙体积分数

Figure 8. Pore volume fraction of SAC mortar with different silane contents at the age of 1 d and 3 d

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图 9 3 d龄期时0%和2%硅烷掺量SAC砂浆微观形貌

Figure 9. Microscopic topography of SAC mortar with 0% and 100% silane content at the age of 3 d

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图 10 1 d和3 d龄期时不同硅烷掺量SAC净浆试样的XRD谱

Figure 10. XRD patterns of SAC paste with different silane contents at 1 d and 3 d ages

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图 11 不同硅烷掺量对SAC砂浆表面水分接触角的影响

Figure 11. Effects of different silane content on the water contact angle of SAC mortar

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图 12 不同硅烷掺量SAC砂浆接触角余弦值与毛细吸水系数间的关系

Figure 12. Relationships between the cosθ of the contact angle and the C of SAC mortar with different silane contents

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图 13 不同硅烷掺量SAC砂浆与基体间界面剪切强度

Figure 13. Interface shear strength between SAC mortar with different silane contents and substrates with different saturation

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图 14 与基体粘结前后SAC砂浆的毛细吸水性能

Figure 14. Capillary water absorption properties of SAC mortar before and after bonding to substrates

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表 1 SAC的化学成分

Table 1. Chemical composition of SAC

Component MgO Al₂O₃ SiO₂ SO₃ CaO Fe₂O₃ Others

Mass fraction/wt% 2.67 16.87 10.48 12.90 52.40 2.86 1.82

Note: SAC refers to the sulphoaluminate cement.

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