Proper understanding of the use of concrete antifreezing agent temperature and usage

Any a meet standard of antifreeze agent products, are has a clear of "using temperature" (as-15 ℃, and-20 ℃), said using temperature is "allows concrete construction of temperature" does not errors, but should focuses on and concrete anti-frozen critical strength contact up understanding, that in environment temperature down to plus agent "using temperature" Qian, concrete must reached anti-frozen critical strength, such concrete is security of, or concrete has may was frozen bad. Lower the temperature of concrete shows better the antifreeze the antifreeze, concrete will have more time (with negative temperature) to increase strength, so as to achieve the possibility of resistant freezing critical strength greatly increased.

Currently domestic production of concrete antifreeze agent of using temperature more in-10 ℃ ~-15 ℃ Zhijian (can applies Yu day minimum-15 ℃ ~-20 ℃ of situation), temperature again again low, antifreeze agent formula design difficulty more big, not determine factors also increased, from this angle told, most situation Xia no necessary have requirements antifreeze agent of using temperature must below construction Shi of minimum environment temperature, key is must in temperature down to antifreeze agent using temperature Qian on makes concrete reached anti-frozen critical strength.

Some instructions on the dosage as a benchmark volume, when adjusted according to the actual temperature from top to bottom, this practice is risky. In General, compare antifreeze products at the time of formulation of the formal content corresponding to the temperature is one by one, there is no adjustment. Most antifreeze component has optimal content issues, very narrow scope, contents and functions and relations. Such as 3% doped is 4, the group will increase by 33%, probably caused by the increase in air content resulting in decreased strength (about 5%~10%) Because of Na2SO4, NaNO3, increasing the alkali content is bad for durability. If changing from 3% to 2%, the effect would certainly not a question of reduction of 33%, and more. Not only the antifreeze, and other additives are likely to do so.