Flexural behavior of textile reinforced mortar-autoclaved lightweight aerated concrete composite panels

Abstract

To improve the deficiencies of prefabricated autoclaved lightweight aerated concrete (ALC) panel such as susceptibility to cracking and low load-bearing capacity, a textile-reinforced mortar-autoclaved lightweight aerated concrete (TRM-ALC) composite panel was developed in this study. One group of reference ALC panels and five groups of TRM-ALC panels were fabricated and subjected to four-point flexural tests. TRM was applied on the tensile side of the ALC panels to create TRM-ALC. The variable parameters were the plies of textile (one or two), type of textile (basalt or carbon), and whether the matrix (without textile) was applied on the compression side of panel. The results showed that a bonding only 8-mm-thick TRM layer on the surface of the ALC panel could increase the cracking load by 180%−520%. The flexural capacity of the TRM-ALC panel increased as the number of textile layers increased. Additional reinforcement of the matrix on the compressive side could further enhance the stiffness and ultimate load-bearing capacity of the TRM-ALC panel. Such panels with basalt textile failed in flexural mode, with the rupture of fabric mesh. Those with carbon textile failed in shear mode due to the ultra-high tensile strength of carbon. In addition, analytical models related to the different failure modes were presented to estimate the ultimate load-carrying capacity of the TRM-ALC panels.

Graphical abstract

Keywords

prefabricated autoclaved lightweight aerated concrete panel / textile-reinforced mortar / cracking load / flexural capacity / stiffness

References

[1] Xu C Y, Nehdi M L, Wang K L, Guo Y. Experimental study on seismic behavior of novel AAC prefabricated panel walls. Journal of Building Engineering, 2021, 44: 103390

[2] Ma F D, Deng M K, Yang Y. Experimental study on internal precast beam–column ultra-high-performance concrete connection and shear capacity of its joint. Journal of Building Engineering, 2021, 44: 103204

[3] Yardim Y, Waleed A M T, Jaafar M S, Laseima S. AAC-concrete light weight precast composite floor slab. Construction and Building Materials, 2013, 40: 405–410

[4] Wang B, Wang P, Chen Y S, Zhou J, Kong X, Wu H, Fan H, Jin F. Blast responses of CFRP strengthened autoclaved aerated cellular concrete panels. Construction and Building Materials, 2017, 157: 226–236

[5] Salgado I D P, Silva F D A. Flexural behavior of sandwich panels combining curauá fibre-reinforced composite layers and autoclaved aerated concrete core. Construction and Building Materials, 2021, 286: 122890

[6] Mousa M A, Uddin N. Experimental and analytical study of carbon fibre-reinforced polymer (FRP)/autoclaved aerated concrete (AAC) sandwich panels. Engineering Structures, 2009, 31(10): 2337–2344

[7] Tuncer E, Binici B, Canbay E. Behavior and design of FRP bonded autoclaved aerated concrete beams. Construction and Building Materials, 2021, 282: 122712

[8] Kouris L A S, Triantafillou T C. State-of-the-art on strengthening of masonry structures with textile reinforced mortar (TRM). Construction and Building Materials, 2018, 188: 1221–1233

[9] Yin S P, Xu S L, Li H. Improved mechanical properties of textile reinforced concrete thin plate. Journal of Wuhan University of Technology. Materials Science Edition, 2013, 28(1): 92–98

[10] Carozzi F G, Bellini A, D’Antino T, de Felice G, Focacci F, HojdysŁ, Laghi L, Lanoye E, Micelli F, Panizza M, Poggi C. Experimental investigation of tensile and bond properties of Carbon-FRCM composites for strengthening masonry elements. Composites. Part B, Engineering, 2017, 128: 100–119

[11] Zhang Y X, Zhang S J, Deng M K. Four-point bending tests of ECC: Mechanical response and toughness evaluation. Case Studies in Construction Materials, 2022, 17: e01573

[12] Portal N W, Thrane L N, Lundgren K. Flexural behaviour of textile reinforced concrete composites: Experimental and numerical evaluation. Materials and Structures, 2017, 50(1): 1–14

[13] Kariou F A, Triantafyllou S P, Bournas D A, Koutas L N. Out-of-plane response of masonry walls strengthened using textile-mortar system. Construction and Building Materials, 2018, 165: 769–781

[14] Kariou F A, Triantafyllou S P, Bournas D A. TRM strengthening of masonry arches: An experimental investigation on the effect of strengthening layout and textile fibre material. Composites. Part B, Engineering, 2019, 173: 106765

[15] Meriggi P, Caggegi C, Gabor A, de Felice G. Shear−compression tests on stone masonry walls strengthened with basalt textile reinforced mortar (TRM). Construction and Building Materials, 2022, 316: 125804

[16] Gao W Y, Hu K X, Dai J G, Dong K, Yu K Q, Fang L J. Repair of fire-damaged RC slabs with basalt fabric-reinforced concrete. Construction and Building Materials, 2018, 185: 79–92

[17] Ding Z, Xu M R, Dai J G, Dong B Q, Zhang M J, Hong S X, Xing F. Strengthening concrete using phosphate cement-based fibre-reinforced inorganic composites for improved fire resistance. Construction and Building Materials, 2019, 212: 755–764

[18] Yang X, Gao W Y, Dai J G, Lu Z D. Shear strengthening of RC beams with FRP grid-reinforced ECC matrix. Composite Structures, 2020, 241: 112120

[19] Portal N W, Flansbjer M, Zandi K, Wlasak L, Malaga K. Bending behaviour of novel textile reinforced concrete-foamed concrete (TRC-FC) sandwich elements. Composite Structures, 2017, 177: 104–118

[20] Schladitz F, Frenzel M, Ehlig D, Curbach M. Bending load capacity of reinforced concrete slabs strengthened with textile reinforced concrete. Engineering Structures, 2012, 40: 317–326

[21] Koutas L N, Bournas D A. Flexural Strengthening of two-way RC slabs with textile-reinforced mortar: Experimental investigation and design equations. Journal of Composites for Construction, 2017, 21(1): 04016065

[22] Zhang H Y, Liu H Y, Kodu V, Li M Y, Zhou Y. Flexural behavior of concrete slabs strengthened with textile reinforced geopolymer mortar. Composite Structures, 2022, 284: 115220

[23] Yin S P, Feng L L, Zhao J L. Study on the tensile and flexural mechanical properties of TRE in freezing−thawing environments. Construction and Building Materials, 2021, 268: 121150

[24] Dong Z F, Deng M K, Dai J, Song S. Flexural strengthening of RC slabs using textile reinforced mortar improved with short PVA fibres. Construction and Building Materials, 2021, 304: 124613

[25] Deng M K, Dong Z F, Zhang C. Experimental investigation on tensile behavior of carbon textile reinforced mortar (TRM) added with short polyvinyl alcohol (PVA) fibres. Construction and Building Materials, 2020, 235: 117801

[26] Zhang W, Deng M K, Han Y G, Li R, Yang S. Uniaxial tensile performance of high ductile fibre-reinforced concrete with built-in basalt textile grids. Construction and Building Materials, 2022, 315: 125716

[27] GB/T11969-2020. Test Methods of Autoclaved Aerated Concrete. Beijing: China Building Materials Federation, Standardization Administration of the People’s Republic of China, 2020 (in Chinese)

[28] GB/T36262. Fibre Reinforced Polymer Composite Grids for Civil Engineering. Beijing: China Building Materials Federation, Standardization Administration of the People’s Republic of China, 2018 (in Chinese)

[29] DBJ61/T112-2016. Technical Specification for Application of High Ductile Concrete. Xi’an: Shaanxi Provincial Building Standard Design Office, 2016 (in Chinese)

[30] FengPQiang HYeL P. Discussion and definition on yield points of materials, members and structures. Engineering Mechanics, 2017, 3: 41−51 (in Chinese)

[31] He W D, Wang X, Ding L N, Wu Z. Efficiency of different BFRP-based strengthening techniques in improving flexural behavior of RC slabs. Construction and Building Materials, 2021, 308: 125002

[32] Harajli M, ElKhatib H, San-Jose J T. Static and cyclic out-of-plane response of masonry walls strengthened using textile-mortar system. Journal of Materials in Civil Engineering, 2010, 22(11): 1171–1180

[33] ZhengK QLiu ZMengS PQinS Q. Novel calculation method for shear capacity of RC beams without web reinforcement. Journal of Southeast University (Natural Science Edition), 2017, 47 (2): 362–368 (in Chinese)

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