Design and self-repair behavior of clay-cured microcapsule composite cementitious materials
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摘要: 采用圆锅造粒法,通过对微胶囊工艺与配方参数进行设计和优化,制备了以粘土固化剂、膨润土、MgO膨胀剂和微晶纤维素为芯材,以乙基纤维素(EC)为壁材的微胶囊,采用正交试验探索了微胶囊芯材组分对自修复微胶囊/水泥基复合材料自修复效果的影响并确定了微胶囊芯材的最佳组成为:粘土固化剂为10wt%、MgO膨胀剂为35wt%、微晶纤维素为6wt%,膨润土为49wt%。研究结果表明,随着微胶囊掺量的增加,自修复水泥基材料的抗压强度降低,当微胶囊掺量(占水泥质量)为3%时,自修复微胶囊/水泥基复合材料的抗压强度相较于空白组仅下降了4%且具有较高的强度恢复率为103.8%。通过数字散斑相关方法(DSCM)对加载过程中的自修复微胶囊/水泥基复合材料的变形行为进行了追踪测试。从应力-应变曲线、应变场分布、灰度相关系数特征值(Stc)和应变特征值(Sts)之间的变化规律,得出自修复微胶囊/水泥基复合材料的自修复机制,基于微胶囊破裂时产生了与水泥基同源物质钙钒石(AFt)和Mg(OH)2对裂纹进行填补,限制裂纹发展,达到修复裂纹的目的。Abstract: Using the round pot granulation method, through the design and optimization of the microcapsule process and formulation parameters, microcapsules with clay solidifying agent, bentonite, MgO expansion agent and microcrystalline cellulose as the core material and ethyl cellulose (EC) as the core material were prepared. For the microcapsules of the wall material, the influence of the components of the microcapsule core material on the self-healing effect of the self-healing microcapsule/cementitious composite material was explored by orthogonal experiments, and the optimal composition of the microcapsule core material was determined: That is, the clay curing agent is 10wt% , MgO expansion agent is 35wt%, microcrystalline cellulose is 6wt%, and bentonite is 49wt%. The results show that the compressive strength of self-healing microcapsule/cementitious composite decreases with the increase of the content of microcapsules. When the content (mass to cement) of microcapsules is 3%, the compressive strength of self-healing microcapsule/cementitious composite is only dropped by 4% with a high strength recovery rate of 103.8%. The deformation behavior of self-healing microcapsule/cementitious composites during loading was traced and tested by the digital speckle correlation method (DSCM). From the stress-strain curve, strain field distribution, gray correlation coefficient eigenvalues (Stc) and strain eigenvalues (Sts), the self-healing mechanism of self-healing microcapsule/cementitious composite is based on the fact that when the microcapsules rupture, the cement-based homologous substances (AFt, Mg(OH)2) are generated to fill the cracks, limit the development of cracks, and achieve the purpose of repairing cracks.
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Key words:
- microcapsule /
- cement-based material /
- clay curing /
- mechanical damage /
- self-healing behavior
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图 15 不同微胶囊掺量的水泥基自修复材料 样品预压至60%极限抗弯应力(σmax)(左)和在大气环境下修复后加载至60% σmax(右)X方向的应变场:((a), (b)) 0%;((c), (d)) 3%
Figure 15. Samples of cement-based self-repairing materials with different content of microcapsules were pre-pressed to 60% σmax (left) and the strain field loaded to 60% maximum bending stress (σmax)(right) X direction after repair in atmospheric environment: ((a), (b)) 0%; ((c), (d)) 3%
表 1 微胶囊固料配合比
Table 1. Solid material mix ratio of microcapsules
Clay curing agent/wt% MgO expansion agent/wt% Microcrystalline cellulose/wt% Bentonite/
wt%10 35 6 49 表 2 微胶囊组分三因素四水平正交试验设计表
Table 2. Three-factors and four-levels orthogonal experimental design of microcapsule components
No.A B C D Clay curing agent/wt% MgO expansion agent/wt% Microcrystalline
cellulose/wt%Bentonite/wt% 1(A1B1C1) 5 5 2 88 2(A1B2C2) 5 15 4 76 3(A1B3C3) 5 25 6 64 4(A1B4C4) 5 35 8 52 5(A2B1C2) 10 5 4 81 6(A2B2C1) 10 15 2 73 7(A2B3C4) 10 25 8 57 8(A2B4C3) 10 35 6 49 9(A3B1C3) 15 5 6 74 10(A3B2C4) 15 15 8 62 11(A3B3C1) 15 25 2 58 12(A3B4C2) 15 35 4 46 13(A4B1C4) 20 5 8 67 14(A4B2C3) 20 15 6 59 15(A4B3C2) 20 25 4 51 16(A4B4C1) 20 35 2 43 表 3 微胶囊囊芯组分对自修复微胶囊/水泥基复合材料的抗压强度和强度恢复率的影响正交试验结果
Table 3. Effects of microcapsule core components on compressive strength and strength recovery rate of self-healing microcapsule/cement-based composites: Orthogonal test results
No. Compressive strength
/MPaRepair strength
/MPaRepair efficiency
/%1(A1B1C1) 52.2 58.7 112.5 2(A1B2C2) 45.4 56.3 124.0 3(A1B3C3) 52.6 58.6 111.4 4(A1B4C4) 61.4 77.6 121.1 5(A2B1C2) 73.4 76.8 104.7 6(A2B2C1) 68.3 57.7 84.4 7(A2B3C4) 55.6 73.3 131.9 8(A2B4C3) 76.4 79.3 103.8 9(A3B1C3) 62.2 73.5 118.2 10(A3B2C4) 69.3 62.5 90.2 11(A3B3C1) 67.2 67.0 99.7 12(A3B4C2) 59.4 34.3 57.7 13(A4B1C4) 62.9 57.1 90.8 14(A4B2C3) 68.6 56.0 81.6 15(A4B3C2) 72.7 64.5 88.7 16(A4B4C1) 68.2 70.0 102.6 表 4 以水泥基自修复材料抗压强度为指标的方差统计F值分析表
Table 4. Statistics of variance F value analysis table with compressive strength of cement-based self-repairing materials as index
Factor Sums of squared deviations Degree of freedom Mean
squareF A 635.30 3 211.77 5.17 B 45.35 3 15.12 0.17 C 17.47 3 5.82 0.06 表 5 各因素对水泥基自修复材料抗压强度作用的均值分析表
Table 5. Analysis of the mean value of each factor against compressive strength
Factor K1j K2j K3j K4j A 52.900 68.425 64.525 68.100 B 62.675 62.900 62.025 66.350 C 63.975 62.725 64.950 62.300 Note: Kij—The ith average value of factor j. 表 6 以水泥基自修复材料修复效率为指标的F值分析表
Table 6. F value analysis table with repair efficiency of cement-based self-repairing materials as index
Factor Sums of squared deviations Degree of freedom Mean
squareF A 1931.91 3 643.97 2.26 B 541.60 3 180.56 0.45 C 466.48 3 155.49 0.38 表 7 各因素对水泥基自修复材料修复效率作用的均值分析表
Table 7. Analysis of means table of the effects of various factors on the repair efficiency of cement-based self-repairing materials
Factor K1j K2j K3j K4j A 117.250 106.200 91.450 90.925 B 106.550 95.050 107.925 97.425 C 99.800 93.775 103.750 108.500 -
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