水溶性聚合物对水下施工混凝土性能的影响.pdf

6 1 Vol. 6, No. 1 2003 3 JOU RN AL O F BU I LDI NG M AT ERIA LS Mar . , 200 3 : 1007- 9629 ( 200 3) 01- 0030- 05 顾国芳, 曹民干 ( , 200092) : 就水溶性高聚物, 如羧甲基纤维素羟乙基纤维素羟丙基甲基纤维素及聚丙烯酰 胺对混凝土 离散性凝结时间及工作性等 影响进行了研究. 结果显示, 水溶性高聚物 能明显降低混凝土在水下施工时 离散性, 提高其强度, 缩短初凝时间, 延长终凝时间; 羟 丙基甲基纤维素具有较好 综合性能. : 水下施工混凝土; 外加剂; 水溶性聚合物 : T U 52 8 : A Effects of Water Soluble Polymers on Underwater Concrete G U G uo-f ang , CA O M in-gan ( School of Mater als Sc ence and Eng neer ng, T ongj U n vers ty, Shang ha 200092) Abstract: T he ef fects of w at er soluble polymers on the propert es of underw at er concret e w ere nvest - g ated. T he polymers u sed nclude polyacry am de, met hy l cellulose, hydroxyethyl cellulose and hydrox- y propyl cellulose. T he t est result s show that the add t on of the polymers n underw ater concret e re- duces s gn f cantly washout of underw ater concret e n water, hence compress ve st rength of t he con- crete s much ncreased . Slump of t he concrete s low ered but can be mproved by us ng w ater reduc ng agent . In t al set t ng t me s shortened and f nal set t ng t me s prolong ed. A mong the polymers tested hydrox ypropyl cellulose show s bett er performances t han ot hers . Key words: underw at er concrete; adm xt ure; w at er soluble polymer , . . , [ 1] , , . , , . , OH N H2 , , , , , , [ 2] , . 1 1. 1 [3] ( CM C) , CMC IH 8 800 ~ 1 200 : 200 1- 10- 31; : 200 1- 11-29 : ( 194 1- ) , , , . 1 : 3 1 mPas , CMC IH 8- 1 3