184
6 Impact Resistance of Basalt Aggregated UHP-SFRC/Fabric …
ballistic limit of projectile was increased about 18% by attaching CFRP on the rear
face of 49 MPa normal strength concrete slab.
As for reducing rear crater and blocking ejecting fragments, from the figures in
Sect. 6.3.1 and discussions in Sect. 6.4.1, CFRP performed better than UHMWPE in
the present test, which might be caused by the poor bonding forces at the interfaces
between UHMWPE and epoxy resins induced by the surface chemical inertness of
the UHMWPE (Chukov et al. 2014).
6.5 Summary
Aiming to protect persons and valuable equipment in the building structures threatened by the perforated small caliber arms and scabbing fragments, the optimal UHPBASFRC was prepared and 7.62 mm API bullet impacting tests on bare and rear
fabric (CFRP or UHMWPE) strengthened UHP-BASFRC panels were conducted.
The prominent protective performance of bare and composite UHP-BASFRC panels
was validated, and the main conclusions are as follows.
(1) Perforation limit of bare UHP-BASFRC panel was experimentally determined
as 77.2 mm, which provides reference for the design of protective structures.
(2) Mixing the coarse aggregates could considerably improve the resistance of
the UHP-SFRC panel and even deviate the terminal trajectory or destruct the
bullet.
(3) Chen’s model (Chen et al. 2008) show high degree of accuracy with the bullet
impact test data of UHP-SFRC panel and a practical reduction coefficient
77.7% is suggested for UHP-BASFRC target.
(4) The rear strengthened two fabrics could reduce the perforation limit and considerably restrain the rear crater dimensions as well as block the ejected fragments,
and moreover, CFRP performed better than UHMWPE.
References
ALMANSA E M, CÁNOVAS M F. Behaviour of normal and steel fiber-reinforced concrete under
impact of small projectiles [J]. Cement and Concrete Research, 1999, 29: 1807–1814.
ALMUSALLAM T, AL-SALLOUM Y, ALSAYED S, IQBAL R, ABBAS H. Effect of CFRP
strengthening on the response of RC slabs to hard projectile impact [J]. Nuclear Engineering and
Design, 2015, 286: 211–226.
AZRUL A. Damage assessment and prediction of FRP strengthened RC structures subjected to
blast and impact loads [D]. Perth: Univ. of West Australia, 2012.
BLUDAU C, KEUSER M, KUSTERMANN A. Perforation resistance of high-strength concrete
panels [J]. ACI Structural Journal, 2006, 103(2): 188–195.
CHEN X W, LI X L, HUANG F L, WU H J, CHEN Y Z. Normal perforation of reinforced
concrete target by rigid projectile [J]. International Journal of Impact Engineering, 2008, 35(10):
1119–1129.
6 Impact Resistance of Basalt Aggregated UHP-SFRC/Fabric …
ballistic limit of projectile was increased about 18% by attaching CFRP on the rear
face of 49 MPa normal strength concrete slab.
As for reducing rear crater and blocking ejecting fragments, from the figures in
Sect. 6.3.1 and discussions in Sect. 6.4.1, CFRP performed better than UHMWPE in
the present test, which might be caused by the poor bonding forces at the interfaces
between UHMWPE and epoxy resins induced by the surface chemical inertness of
the UHMWPE (Chukov et al. 2014).
6.5 Summary
Aiming to protect persons and valuable equipment in the building structures threatened by the perforated small caliber arms and scabbing fragments, the optimal UHPBASFRC was prepared and 7.62 mm API bullet impacting tests on bare and rear
fabric (CFRP or UHMWPE) strengthened UHP-BASFRC panels were conducted.
The prominent protective performance of bare and composite UHP-BASFRC panels
was validated, and the main conclusions are as follows.
(1) Perforation limit of bare UHP-BASFRC panel was experimentally determined
as 77.2 mm, which provides reference for the design of protective structures.
(2) Mixing the coarse aggregates could considerably improve the resistance of
the UHP-SFRC panel and even deviate the terminal trajectory or destruct the
bullet.
(3) Chen’s model (Chen et al. 2008) show high degree of accuracy with the bullet
impact test data of UHP-SFRC panel and a practical reduction coefficient
77.7% is suggested for UHP-BASFRC target.
(4) The rear strengthened two fabrics could reduce the perforation limit and considerably restrain the rear crater dimensions as well as block the ejected fragments,
and moreover, CFRP performed better than UHMWPE.
References
ALMANSA E M, CÁNOVAS M F. Behaviour of normal and steel fiber-reinforced concrete under
impact of small projectiles [J]. Cement and Concrete Research, 1999, 29: 1807–1814.
ALMUSALLAM T, AL-SALLOUM Y, ALSAYED S, IQBAL R, ABBAS H. Effect of CFRP
strengthening on the response of RC slabs to hard projectile impact [J]. Nuclear Engineering and
Design, 2015, 286: 211–226.
AZRUL A. Damage assessment and prediction of FRP strengthened RC structures subjected to
blast and impact loads [D]. Perth: Univ. of West Australia, 2012.
BLUDAU C, KEUSER M, KUSTERMANN A. Perforation resistance of high-strength concrete
panels [J]. ACI Structural Journal, 2006, 103(2): 188–195.
CHEN X W, LI X L, HUANG F L, WU H J, CHEN Y Z. Normal perforation of reinforced
concrete target by rigid projectile [J]. International Journal of Impact Engineering, 2008, 35(10):
1119–1129.