Protective Effect of Surface Coatings on Concrete

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1 JOURNAL OF THE CHINESE CERAMIC SOCIETY 1613 Vol. 40 No. 11 November ,2 1 ( ) CO 2 CO 2 TU56 TU57 A (2012) :54:55 Protective Effect of Surface Coatings on Concrete YANG Ping 1 LI Weihua 1,2 ZHAO Tiejun 1 (1. Qingdao Technical University, Qingdao , Shandong, China; 2. Institute of Oceanology Chinese Academy of Science, Qingdao , 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- JQF01002) (BS2009HZ002) (P ZH-005) (1986 ) (1971 ) Received date: Revised date: First author: YANG Ping (1986 ), female, Master candidate. qdyangping@126.com Correspondent author: LI Weihua (1971 ), female, Ph.D., Professor. liweihua@qdio.ac.cn

2 [9] [10] [11] mm Table 1 Mix proportions of concretes Mix proportion/(kg m 3 ) Mass ratio of water Cement Sand Gravel Water to cement 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 /WP AC100 82/WP ( ) 6 mm 2 3 mm [12] AC100 ( ) ( μm) 0.2 L/m g/m 2 BP B(P+F) BF BS AutoClam AutoClam 500 Pa 500 Pa AutoClam 0 5 min 6 15 min 1 min 6 15 min 1.4 GB/T CO 2 1 d

3 d 56 d d 56 d (5 ± 1) mm 1 ( 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 CO 2 SO 2 CO 2 SO 2 2 [13] [14] B(P+F) BF 28 d B(P+F) BF BP BS mm 5.7 mm [8] Vries [15] CO 2 40 cm 3 28 d 1.5 mm 5.7 mm

4 Fig 3 Carbonation depth of concrete specimens 6 BF Fig. 6 Water absorption of concrete specimen BF 2.3 Dhir [16] 10 min 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) d B(P+F) 82 g/m 2 BF 169 g/m 2 BP 226 g/m 2 BS g/m 2 3 ( )

5 1617 [17] 56 d B(P+F) 121 g/m 2 BF 215 g/m 2 BP g/m 2 3 1) CO 2 2) CO 2 3) 4) 5) [1],,,. ph [J]., 2011, 30(10): YUAN Chengfang, NIU Ditao, DUAN Fuzhen, et al. Bull Chin Ceram Soc (in Chinese), 2011, 30(10): [2],,. [J]., 2009, 37(12): SONG Hua, NIU Ditao, LI Chunhui. J Chin Ceram Soc (in Chinese), 2009, 37(12): [3],,. [J]., 2008(3): LIU Yushan, WANG Zhongcheng, SHE Jianhua. Water Resources and Hydropower Construct (in Chinese), 2008(3): [4]. [M]. :, 2009: ZHAO Tiejun. Surface Treatment with Permeable Coating and Durability of Concrete (in Chinese). Beijing: Science Press, 2009: [5]. [J]., 2004(2): JIANG Zhengwu. New Build Mater (in Chinese), 2004(2): [6],,. [J]., 2007(11): ZHU Guihong, GUO Pinggong, ZHAO Tiejun (in Chinese). Concrete, 2007(11): [7] WITTMANN F H,,. [J]., 2005, 8(1): 1 6. WITTMANN F H, ZHAN Hongyan, ZHAO Tiejun. J Build Mater (in Chinese), 2005, 8(1): 1 6. [8]. [J]., 2003(6): WU Ping. New Build Mater (in Chinese), 2003(6): [9],,. [M]. :, SHEN Chunlin, SUN Lirong, LI Fang. Construction Waterproof Coatings (in Chinese). Beijing: Chemical Industry Press, [10]. [D]. :, WANG Yuqian. Development of CCCM and its waterproofing mechanism [D]. Jiangsu: Southeast University, [11]. [D]. :, XIAN Yongzhen. Influence of Integral Water Repellent Treatment on the Property of Concrete [D]. Shandong: Qingdao Technical University, [12] LUNK P, WITTMANN F H. The behaviour of cracks in water repellent concrete structures with respect to capillary water transport [C]// F. H. Wittmann, edit. Water Repellent Treatment of Building Materials, Proceedings of Hydrophobe. Zuich, 1998: [13],,,. [J]., 2003(1): SUN Zhongxin, LI Jihang, LIU Jixian, et al. Water-proof Mater Construct (in Chinese), 2003(1): [14],,. [J]., 2001, 34(10): YANG Lixia, ZHANG Sanping, LIN An. Mater Protect (in Chinese), 2001, 34(10): [15] de VRIES J, POLDER R B, BORSJE H. Durability of hydrophobic treatment of concrete [C]// Proceedings of Hydrophobe. Zuich: [s.n.], 1998: [16] DHIR R K, JONES M R, BYARS E A, et al. Predicting concrete durability from its absorption [J]. Concr Dur, 1994, 145: [17]. [D]. :, ZHU Guihong. Chloride in Concrete Surface Waterproofing Treatment Feasibility Study [D]. Qingdao: Qingdao Technical University, 2007.