工程水泥基复合材料与发泡式聚苯乙烯保温板的界面粘结性能

李雨珊; 尹世平; 徐世烺; 侯向明; 王宇清; 李传秀

doi:10.13801/j.cnki.fhclxb.20220215.002

工程水泥基复合材料与发泡式聚苯乙烯保温板的界面粘结性能

doi: 10.13801/j.cnki.fhclxb.20220215.002

李雨珊¹,
尹世平^{1, 2, ,},
徐世烺³,
侯向明⁴,
王宇清³,
李传秀¹

1.
中国矿业大学　江苏省土木工程环境灾变与结构可靠性重点实验室，徐州 221116
2.
中国矿业大学　深部岩土力学与地下工程国家重点实验室，徐州 221116
3.
浙江大学　建筑工程学院，杭州 310058
4.
山西五建集团有限公司，太原 030013

基金项目: 徐州市重点研发计划(产业前瞻与共性关键技术领域)(KC18106)

详细信息

通讯作者:
尹世平，博士，教授，博士生导师，研究方向为新型土木工程材料　E-mail: yinshiping2821@163.com

中图分类号: TU528.58
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出版历程
- 收稿日期: 2021-11-23
- 修回日期: 2022-01-15
- 录用日期: 2022-01-30
- 网络出版日期: 2022-02-15
- 刊出日期: 2022-11-01

Bonding properties of the interface between engineering cementitious composite and expanded polystyrene insulation board

1.
Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, China
2.
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
3.
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
4.
Shanxi Wujian Group CO. LTD., Taiyuan 030013, China

摘要

摘要: 随着国家对节能减排的倡导，因建筑围护结构隔热性能不足导致的建筑高能耗问题日益突出。对此，采用一种以工程水泥基复合材料(Engineered cementitious composites，ECC)为面层、发泡式聚苯乙烯(EPS)板为保温层的夹芯(Sandwich)结构墙体来改善围护结构的隔热性能。这种结构不仅能够有效降低能量的耗散，还具有良好的变形和控制裂缝的能力。然而，界面粘结性能是决定其能否充分发挥各自材料优势并满足使用要求的重要前提。于是，对夹芯结构进行了双面剪切试验，研究了制作方式、保温层厚度、有无连接件及插入连接件的角度对ECC面层与EPS保温层界面粘结性能的影响。试验结果表明，EPS预制试件的粘结性能最差，并且其极限荷载的平均值仅为现浇试件的1/4。保温层厚度越大，试件的粘结性能则越差。连接件的加入有助于提高试件的承载能力和界面粘结性能，其中嵌入45°连接件的试件的增强效果最明显。同时，通过对各试件韧性指数的分析发现，有连接件的试件的韧性均较好，无连接件且保温层厚度为50 mm的试件在试验后期也具有较好的界面间粘结性能。此外，还基于Teixeira的分析理论推导了试件的抗剪承载力公式，并与试验结果进行对比，结果表明该计算公式可以用于预测试件的抗剪承载力。
- 夹芯结构 /
- ECC /
- EPS /
- 界面粘结性能 /
- 韧性指数 /
- 抗剪承载力
Abstract: Nowadays, with the national advocacy of energy conservation and emission reduction, the problem of high energy consumption of buildings caused by insufficient thermal insulation performance of building envelopes has become increasingly prominent. In this regard, a sandwich structure wall with engineered cementitious composites (ECC) as the surface layer and expanded polystyrene (EPS) board as the insulation layer was adopted to improve the thermal insulation performance of the enclosure structure. It can not only effectively reduce energy dissipation, but also have excellent deformation and crack control ability. However, the bonding performance is an important prerequisite to determine whether it can give full play to the advantages of its own materials and meet the use requirements. Therefore, a double-sided shear test was carried out on the sandwich structure. The effects of the production method, the thickness of insulation layer, the presence or absence of connectors and the insertion angle of connectors on the bonding properties of interface between ECC surface layer and EPS insulation layer were studied. The test results show that the bonding performance of EPS precast specimens is the worst, and the average value of its ultimate load is only 1/4 of that of in-situ casting specimens. The greater thickness of the insulation layer, the worse bonding performance of the specimens. The addition of connectors helps to improve the bearing capacity and bonding performance of specimens, among which the strengthening effect of specimens with 45° connectors is the most obvious. At the same time, through the analysis of the toughness index, it is found that the toughness of the specimens with connectors is better, and the specimen with the insulation layer thickness of 50 mm in the specimen without connector also has good interfacial bonding performance at the later stage of the test. In addition, based on the analysis theory of Teixeira, the shear bearing capacity formula of the specimens was deduced. Comparing the calculation results with the test results, the results show that the calculation formula can be used to predict the shear bearing capacity of the specimens.
- sandwich structure /
- ECC /
- EPS /
- interface bonding performance /
- toughness index /
- shear capacity

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图 1 ECC-EPS保温板双面剪切试验尺寸图

Figure 1. Size of ECC-EPS insulation board for double-sided shear test

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图 2 ECC-EPS保温板制备过程

Figure 2. Preparation process of ECC-EPS insulation board

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图 3 ECC-EPS保温板双面剪切试验

Figure 3. Double-sided shear test of ECC-EPS insulation board

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图 4 ECC-EPS保温板破坏形态

Figure 4. Failure mode of ECC-EPS insulation board

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图 5 ECC-EPS保温板的荷载-滑移曲线

Figure 5. Load-slip curves of ECC-EPS insulation board

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图 6 峰值荷载后的能量E_post计算

P_peak—Limit load value (kN); δ_peak—Interface slip value at the limit load (mm); δ_post-peak—Interface slip corresponding to the energy value after the peak load

Figure 6. Calculation of energy value after peak load E_post

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表 1 发泡式聚苯乙烯(EPS)性能参数

Table 1. Performance parameters of the expanded polystyrene (EPS)

Heat insulator	Thermal conductivity/(W·(m·K)⁻¹)	Density/(kg·m⁻³)	Tensile strength/MPa	Compressive strength/MPa
EPS	0.039	20	0.13	0.12

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表 2 工程水泥基复合材料(ECC)配合比

Table 2. Mix proportion of engineered cementitious composites (ECC) (kg/m³)

Material	Cement	Fly ash	Quartz sand	Water	Water reducing agent	PVA fiber
Mix proportion	379	885	455	379	17.4	26
Note: PVA—Polyvinyl alcohol.

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表 3 ECC力学性能

Table 3. Mechanical properties of ECC

Specimen number	Compressive strength/MPa	Ultimate tensile strength/MPa	Ultimate tensile strain/%	Ultimate bending load/kN	Ultimate mid-span deflection/mm
ECC-1	57.5	8.76	3.47	0.81	21.90
ECC-2	52.2	7.12	2.63	0.83	24.62
ECC-3	49.3	6.34	3.25	0.79	21.83
Average value	53.0	7.41	3.12	0.81	22.78
Standard deviation	3.40	1.01	0.36	0.02	1.30
Coefficient of variation	0.06	0.14	0.12	0.02	0.06

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表 4 聚乙烯醇(PVA)纤维性能参数

Table 4. Performance parameters of polyvinyl alcohol (PVA) fiber

Type	Length/mm	Diameter/mm	Tensile strength/MPa	Elastic modulus/GPa	Density/(g·cm⁻³)
PVA fiber	12	0.04	1600	42	1.3

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表 5 玄武岩纤维增强树脂复合材料(BFRP)筋的力学性能

Table 5. Mechanical properties of basalt fiber reinforced polymer (BFRP) bars

BFRP diameter/mm	Ultimate tensile strength/MPa	Elastic modulus/GPa	Percentage elongation/%
6	1279	60.12	2.13
8	1194	60.75	1.97
10	1066	55.84	1.91
12	1350	59.40	2.27

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表 6 ECC-EPS保温板试验分组

Table 6. Test group of ECC-EPS insulation board

Specimen number	Type of insulation material	Production method	Insulating layer thickness/mm	BFRP connector or not	Connector insertion angle/(°)
ECC(X)-EPS(70)	EPS	Cast-in-site	70	Without	–
ECC(Y)-EPS(70)	EPS	Prefabrication	70	Without	–
ECC(X)-EPS(50)	EPS	Cast-in-site	50	Without	–
ECC(X)-EPS(100)	EPS	Cast-in-site	100	Without	–
ECC(X)-EPS(70)-BFRP(90)	EPS	Cast-in-site	70	Having	90
ECC(X)-EPS(70)-BFRP(60)	EPS	Cast-in-site	70	Having	60
ECC(X)-EPS(70)-BFRP(45)	EPS	Cast-in-site	70	Having	45
Notes: In specimen number, X—Cast-in-site; Y—Prefabrication; BFRP bar insertion angle refers to the angle between the bar and the specimen in the vertical direction; Insertion depth is 20 mm^[18].

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表 7 ECC-EPS保温板双面剪切试验结果

Table 7. Results of double-sided shear test of ECC-EPS insulation board

Specimen number	Order number	Limit load/kN	Absolute deviation	Displacement/mm				Shear strength/ MPa	Mode of failure
Specimen number	Order number	Limit load/kN	Absolute deviation	Front displacement	Rear displacement	Average value	Absolute deviation	Shear strength/ MPa	Mode of failure
ECC(X)-EPS(70)	1	7.25	0.08	15.90	15.68	15.79	0.49	0.060
	2	7.43	0.10	17.60	17.86	17.73	1.45	0.062	Interfacial failure
	3	7.30	0.03	15.40	15.23	15.32	0.96	0.060
	Average value	7.33	–	–	–	16.28	–	0.060
ECC(Y)-EPS(70)	1	1.92	0.40	3.73	3.87	3.80	0.51	0.016
	2	2.87	0.55	5.73	4.20	4.97	0.66	0.024	Interfacial failure
	3	2.18	0.14	4.35	3.95	4.15	0.16	0.018
	Average value	2.32	–	–	–	4.31	–	0.020
ECC(X)-EPS(50)	1	8.50	0.16	16.41	16.55	16.48	1.49	0.070
	2	8.46	0.20	18.23	18.56	18.40	0.43	0.070	Shear failure of EPS and interfacial failure
	3	9.02	0.36	18.93	19.15	19.04	1.07	0.076
	Average value	8.66	–	–	–	17.97	–	0.072
ECC(X)-EPS(100)	1	6.07	0.00	13.12	15.27	14.20	1.36	0.050
	2	5.74	0.33	11.00	12.31	11.66	1.18	0.048	Interfacial failure
	3	6.39	0.32	11.24	14.10	12.67	0.17	0.054
	Average value	6.07	–	–	–	12.84	–	0.050
ECC(X)-EPS(70)-BFRP(90)	1	11.13	0.45	27.75	29.33	28.54	4.52	0.092
	2	11.89	0.31	19.49	20.38	19.94	4.08	0.100	Shear failure of EPS and BFRP bars splitting
	3	11.72	0.14	23.22	23.95	23.59	0.43	0.098
	Average value	11.58	–	–	–	24.02	–	0.096
ECC(X)-EPS(70)-BFRP(60)	1	20.53	1.07	12.81	13.64	13.23	0.01	0.172
	2	20.60	1.00	11.16	10.40	10.78	2.46	0.172	Bending failure of two ECC boards on the outside
	3	23.67	2.07	15.73	15.69	15.71	2.47	0.198
	Average value	21.60	–	–	–	13.24	–	0.181
ECC(X)-EPS(70)-BFRP(45)	1	47.74	5.33	18.90	20.80	19.85	2.35	0.398
	2	40.60	1.81	19.26	21.30	20.28	2.78	0.338	Interfacial failure
	3	38.90	3.51	12.67	12.05	12.36	5.14	0.324
	Average value	42.41	–	–	–	17.50	–	0.354

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表 8 ECC-EPS保温板韧性指数

Table 8. Toughness index of ECC-EPS insulation board

Specimen number	E_post/(kN·mm)	P_peak/kN	δ_peak/mm	α_S
ECC(X)-EPS(70)	36.7	7.25	3.49	2.90
ECC(Y)-EPS(70)	2.4	2.87	1.51	1.09
ECC(X)-EPS(50)	78.8	9.02	4.46	3.92
ECC(X)-EPS(100)	25.8	6.07	6.68	1.27
ECC(X)-EPS(70)-BFRP(90)	124.2	11.89	5.90	3.54
ECC(X)-EPS(70)-BFRP(60)	142.0	23.67	1.88	6.38
ECC(X)-EPS(70)-BFRP(45)	425.0	47.74	2.55	6.98
Notes: E_post—Energy value after the peak load (kN·mm); α_S—Toughness index.

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表 9 ECC-EPS保温板计算荷载与实际荷载值对比

Table 9. Comparison of calculated load and actual load of ECC-EPS insulation board

Specimen number	Failure load/kN			Theoretical contribution value/%
Specimen number	Experimental value	Theoretical value	Experimental value/ Theoretical value	Thermal insulating material	Connectors
ECC(X)-EPS(70)-BFRP(90)	11.89	11.11	1.07	70.21	29.79
ECC(X)-EPS(70)-BFRP(60)	23.67	22.77	1.04	16.51	83.49
ECC(X)-EPS(70)-BFRP(45)	47.74	32.56	1.47	15.66	84.34

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