Sulfate attack resistance method of concrete

Abstract

The invention relates to an attack resistance method of concrete, in particular to a sulfate attack resistance method of concrete. The method is characterized by adopting mortar samples, curing 40cm*40cm*160cm prism samples in the water at the temperature of 50 DEG C for seven days and then carrying out an attack test; soaking the samples at the room temperature for 16 hours, soaking one group of the samples in the water at the temperature of 20 DEG C and soaking another two groups of samples in 0.3% of Na2SO4 solution and 3% of Na2SO4 solution respectively, drying the samples at the temperature of 75 DEG C for seven hours and cooling the samples for one hour, taking the above steps as a cycle, totally carrying out 28 cycles, then testing the flexural strength of the mortar, computing the relative flexural strength K of the mortar according to the following formula: K=flexural strength of the mortar after the mortar cycles in the sodium sulfate solution / flexural strength of the mortar after the mortar carries out the same cycling in the tap water; and finally relatively evaluating the attack resistance of the mortar by using K in the test result.

Description

technical field [0001] The invention relates to a concrete corrosion resistance method, in particular to a concrete sulfate corrosion resistance method. Background technique [0002] my country has formulated national standards for the test method of cement sulfate corrosion resistance three times: GB 749-1965, GB / T 2420-1981 and GB / T 749-2001, but these test methods and evaluation indicators still exist There are some shortcomings or deficiencies. my country's early national standard GB749-1965111 basically followed the former Soviet Union's H 114-54 in 1954, using 1:3.5 mortar, and the test piece was a rectangular test body of 10mm×10mm×30mm. In order to ensure the consistency of the test results, the test pieces are pressurized and cured for 1 day in humidity and 14 days in fresh water. Then some of the test pieces are still kept in fresh water, and the other part is put into the environment water containing sulfate or artificially. In the prepared sulfate solution, it c...

AI Technical Summary

Problems solved by technology

Currently, the most commonly used concrete anti-sulfate attack method is the dry-wet cycle method. The dry-wet cycle method mainly uses temperature change control to accelerate the crystallization and expansion of corrosive ions inside the concrete, but how high the temperature is the best? It is suitable to study the anti-corrosion performance of concrete, we do not know