THE EFFECT OF CHLORIDE-ION SOURCE ON THE FREE CHLORIDE-ION PERCENTAGES IN OPC MORTARS

被引：15

作者：

ALHUSSAINI, MJ ^{[1
]}

SANGHA, CM ^{[1
]}

PLUNKETT, BA ^{[1
]}

WALDEN, PJ ^{[1
]}

机构：

[1] PORTSMOUTH POLYTECH,DEPT CHEM,PORTSMOUTH PO1 2DZ,HANTS,ENGLAND

来源：

CEMENT AND CONCRETE RESEARCH | 1990年 / 20卷 / 05期

关键词：

Calcium Compounds--pH Effects - Concrete Reinforcements--Corrosion - Ion Sources - Sodium Chloride--Concentration;

D O I：

10.1016/0008-8846(90)90007-K

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The effect of incorporating varying percentages of sodium chloride (NaCl) and calcium chloride (CaCl2) in ordinary Portland cement (OPC) mortar mixes on the free chloride ion content was investigated. After curing for 28 days with different levels of chloride ions, mixes were tested to assess the percentages of chlorides that remain in the pore solutions and those that are chemically bound by the cement hydration products. It was found that a considerable amount of chloride remains in a free form and that NaCl produces higher percentages of free chloride ions than CaCl2 at all concentrations up to 2% (Cl- ion by mass of cement). NaCl was also found to produce lower pH than CaCl2. Thus NaCl will present a greater threat in terms of corrosion of reinforcement than CaCl2. © 1990.

引用

页码：739 / 745

页数：7

共 7 条

[1]

[Anonymous], 1985, STRUCTURAL USE CONCR

[2] ASSESSMENT OF SIMPLE METHODS OF DETERMINING THE FREE CHLORIDE-ION CONTENT OF CEMENT PASTE [J].

ARYA, C ;

BUENFELD, NR ;

NEWMAN, JB .

CEMENT AND CONCRETE RESEARCH, 1987, 17 (06) :907-918

[3]

BERMAN HA, 1972, J MATER, V7, P330

[4]

Biczok I., 1964, CONCRETE CORROSION C

[5] EFFECTS OF A FLY-ASH ON PORE SOLUTION COMPOSITION IN CALCIUM AND SODIUM CHLORIDE-BEARING MORTARS [J].

KAWAMURA, M ;

KAYYALI, OA ;

HAQUE, MN .

CEMENT AND CONCRETE RESEARCH, 1988, 18 (05) :763-773

[6]

Ramachandran V.S., 1984, MATER STRUCT, V17, P285

[7]

1971, METHODS TESTING CO 6

← 1 →