Application of PP-ECC in beam–column joint connections of rigid-framed railway bridges to reduce transverse reinforcements

High performance cementitious composite from alkali-activated ladle slag reinforced with polypropylene fibers

“…After the first crack onset, the 2PP-MF and 2PP-SF exhibited PSH behavior under fiber bridging effect with an increase in peak load of 18% and 27%, respectively, in comparison to the initial crack load. Similar results in literature were reported on PP fibers [16,67] or hybrid PP-PVA fibers [35] reinforced Portland cement based ECC. Interestingly, the 2PP-SF absorbed more energy under uniaxial tensile load than the 2PP-MF, while the latter had a smaller softening post-peak branch with a lower strain at failure (see Fig.…”

Seismic behavior of reinforced engineered cementitious composite members and reinforced concrete/engineered cementitious composite members: A review

“…Note that the study conducted by Said and Razak 52 reported a similar shear failure for ECC joints without stirrups after experiencing large beam yielding deformation. Although it lacked compressive strength data, the joint shear stress in their study would have been almost 1.44f c 00.5 (9 MPa), assuming a similar compressive strength to that reported by Yuan et al 3 In the study of RECC external joints conducted by Zhang et al, 53 no stirrups were provided in the ECC regions and three design layouts for ECC in joints were used: (a) ECC only in the joint region; (b) ECC in the joint region and in entire beams; and (c) ECC in the joint region and in entire beams and columns. The results indicated that joint shear failure was avoided for all joints due to a low joint shear stress of about 0.3f c 00.5 and a flexure failure mode for beams was observed.…”

“…Moreover, extensive experimental study has demonstrated that ECC has great potential for use in structural members to improve or strengthen static mechanical behaviour [29][30][31][32][33][34][35] and seismic behaviour. 2,3,5,[36][37][38][39][40][42][43][44][45][46][47][48][49][51][52][53][54][55][56][57][58] Therefore, the application of ECC at key structural positions may be an effective way to enhance the seismic performance of structures in regions of high seismic risk.…”

Avaliação da resistência a fadiga dos Engineered Cementitious Composites (ecc), reforçados com fibra de polipropileno e produzidos com adição de cinza de casca de arroz

“…Na figura 12, o mesmo banco de dados de ensaios de fadiga realizados em ECC da figura 11 foi utilizado, destacando ensaios realizados em PPECC (círculos em vermelho) em PVAECC (triângulos em preto). O baixo custo quando comparadas com as fibras de PVA, a ductilidade, a superfície hidrofóbica e a facilidade de dispersão são características que tornam as fibras de PP adequadas para incorporação em um compósito cimentício, segundo Raivio e Sarvantra [16] e Zhang et al [17].Por outro lado, a natureza apolar das fibras de PP pode prejudicar a aderência do compósito [18], uma vez que a pasta de cimento apresenta natureza polar. Resultados de Pakravan et al [19] mostraram que apesar de haver um intertravamento entre as fibras de PP e a matriz de cimento, existe deficiência da adesão química entre as fibras de PP e os produtos de hidratação do cimento.…”