PSI - Issue 64

Sareh Akbarpoor et al. / Procedia Structural Integrity 64 (2024) 822–832 Sareh Akbarpoor/ Structural Integrity Procedia 00 (2019) 000 – 000

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(a) (b) Fig. 2. Mechanical tests of developed cement-based adhesives: (a) Compressive tests; (b) Flexural tests.

2.1.5. Quartz Sand Quartz sand, produced by Sika, with the particle size range of 0.3-0.8 mm was used for surface treatment of CFRP laminates for CBA-S-100 specimens. 2.2. Specimen Preparation The specimens were cast and allowed to cure for 28 days. Subsequently, a groove measuring 9 mm in width and 15 mm in depth, as per ACI 440.2R (2017), was meticulously cut along the surface of each specimen longitudinally. To minimize stress concentration, the CFRP laminates were adjusted to a length of 260 mm, extending 110 mm out of each specimen. This ensured they were positioned 50 mm away from the specimen's edge and affixed with two aluminium plates, each 60 mm in length. Additionally, the bonded length of 100 mm for CFRP laminates was considered, positioned 20 mm away from the unloaded surface of the specimen and 30 mm away from the loaded surface. For CBA-S-100 specimens, sand treatment was applied to the bonded length area of CFRP laminates using Sika Quartz Sand and Sikadur 330. Before applying the adhesive, the groove was moistened with water. Then, the adhesive was applied to fill the groove within the bonded length area. The CFRP laminate was inserted into the centre of the groove using spacers to ensure even adhesive distribution around the CFRP laminate. Finally, the groove was filled, and the surface was levelled with the adhesive. After 28 days of curing, the specimens were ready for pull-out testing.