40 11 2012 11 JOURNAL OF THE CHINESE CERAMIC SOCIETY 1613 Vol. 40 No. 11 November 2012 1 1,2 1 (1. 266033 2. 266071) CO 2 CO 2 TU56 TU57 A 0454 5648(2012)11 1613 05 2012 10 31 10:54:55 http://www.cnki.net/kcms/detail/11.2310.tq.20121031.1054.201211.1613_012.html Protective Effect of Surface Coatings on Concrete YANG Ping 1 LI Weihua 1,2 ZHAO Tiejun 1 (1. Qingdao Technical University, Qingdao 266033, Shandong, China; 2. Institute of Oceanology Chinese Academy of Science, Qingdao 266071, Shandong, China) Abstract: Three coating methods, i.e., the permeable coating, the film forming coating and the combined both were used to treat the surface of specimens. Their protective effects on concrete were investigated via the carbonation and capillary water adsorption tests. The results show that the combined application has the optimum efficiency to prevent the diffusion and migration of CO 2 and H 2 O into the concrete. The second is the film forming coating. The permeable coatings could reduce the water into the concrete, but hardly prevented CO 2. Keywords: concrete; surface coating; carbonation depth; capillary water absorption; protective effect CO 2 [1 2] [3] [4] [5] [6 7] [8] 2012 05 07 2012 06 12 (51179182) (2012- JQF01002) (BS2009HZ002) (P2010-1-ZH-005) (1986 ) (1971 ) Received date: 2012 05 07. Revised date: 2012 06 12. First author: YANG Ping (1986 ), female, Master candidate. E-mail: qdyangping@126.com Correspondent author: LI Weihua (1971 ), female, Ph.D., Professor. E-mail: liweihua@qdio.ac.cn
1614 2012 [9] [10] [11] 1 1.1 25 mm 2.9 42.5 1 1 Table 1 Mix proportions of concretes Mix proportion/(kg m 3 ) Mass ratio of water Cement Sand Gravel Water to cement 320 653 1 267 160 0.5 100 mm 100 mm 100 mm 48 h 28 d 100 mm 100 mm 100 mm 48 h [(20 ± 3) RH 90%] 14 d () (20 ± 3) RH 50% 14 d 100 mm 100 mm 400 mm 48 h 28 d 1.2 82/WP AC100 82/WP ( ) 6 mm 2 3 mm [12] AC100 ( ) (80 100 μm) 0.2 L/m 2 200 g/m 2 BP B(P+F) BF BS 3 1.3 AutoClam AutoClam 500 Pa 500 Pa AutoClam 0 5 min 6 15 min 1 min 6 15 min 1.4 GB/T 50082 2009 4 CO 2 1 d
1615 3 7 14 28 d 56 d 1.5 4 0 7 14 28 d 56 d (5 ± 1) mm 1 (0 0.5 1 2 4 8 12 24 36 48 72 h) 2 Fig 2 Air permeability index of concrete specimens BP Concrete specimens treated with water repellent agent; B(P+F) Concrete specimens treated with water repellent agent plus film-forming coating; BF Concrete specimens coated with film-forming coating; BS Untreated concrete specimens. 1 Fig. 1 Sketch of capillary absorption of concrete specimen 2 2.1 CO 2 SO 2 CO 2 SO 2 2 [13] [14] 2.2 3 B(P+F) BF 28 d B(P+F) BF BP BS 4 0.7 1.5 5.3 mm 5.7 mm [8] Vries [15] CO 2 40 cm 3 28 d 1.5 mm 5.7 mm
1616 2012 3 Fig 3 Carbonation depth of concrete specimens 6 BF Fig. 6 Water absorption of concrete specimen BF 2.3 Dhir [16] 10 min 4 7 7 BS Fig. 7 Water absorption of concrete specimen BS 4 BP Fig. 4 Water absorption of concrete specimen BP 5 B(P+F) Fig. 5 Water absorption of concrete specimen B(P+F) 4 7 2.4 4 7 0 d B(P+F) 82 g/m 2 BF 169 g/m 2 BP 226 g/m 2 BS 2 175 g/m 2 3 (100 130 )
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