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钢筋锈蚀引起混凝土破坏,一般的修补常是治表不治里。然而阴极保护系统即使在含盐混凝土内,也能阻止钢筋锈蚀。就象电池一样,混凝土中被盐溶液隔离的金属会产生电流,电流发源处(阳极)氧化生成锈斑,而电流终止处(阴极)并不产生任何破坏。为阻止钢筋氧化锈蚀,需增加一个新的阳极。新阳极应用不起氧化作用的金属做成,把阳极金属和电源的正极连起来,把所有的钢筋与电源的负极连起来,整个钢筋格栅网就成了阴极。一旦阴极保护系统成立,钢筋就不再受破坏了。由于阳极只能保护离其152.4mm(6in)内的钢筋,所以阳极金属必须紧紧地贴在整个受保护区域的上方。钛薄板重量轻,静载小,膨胀后可做成3×33.87mm(3×1.33in)孔径的菱形网筛。涂混合贵金属氧化物的钛,阳极反应只产生氧。
Corrosion of reinforcing steel causes concrete damage, and the general repair is often a rule. However, the cathodic protection system prevents corrosion of steel bars even in salty concrete. Just like a battery, a metal isolated from salt solution in a concrete generates a current, oxidation occurs at the origin of the current (anode), and rust occurs, and no breakdown is caused at the end of the current (cathode). To prevent corrosion of the steel bars, a new anode is required. The new anode is made of non-oxidizing metal. The anode metal is connected to the positive pole of the power supply. All the steel bars are connected to the negative pole of the power supply. The entire steel bar grid network becomes the cathode. Once the cathodic protection system is established, the steel bars are no longer damaged. Since the anode can only protect the steel within its 152.4mm (6in), the anode metal must be tightly attached over the entire protected area. The thin titanium plate is light in weight and small in static load, and can be expanded into a diamond-shaped mesh sieve of 3×33.87 mm (3×1.33 in) diameter. Titanium mixed with precious metal oxides is coated and the anode reaction produces only oxygen.