Sulfate attack resistance method of concrete

A technology of anti-sulfate and concrete, applied in the field of anti-sulfate corrosion of concrete, can solve the problems of accelerated corrosive ion crystal expansion and other problems

Inactive Publication Date: 2011-06-08
SHANGHAI SINO CARBIDE
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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 crysta

Method used

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Embodiment Construction

[0009] The method for resisting sulfate corrosion of concrete according to the present invention is characterized in that: the method adopts a mortar test piece, and the prism test piece of 40cm × 40cm × 160cm is maintained in 50°C water for 7 days and then subjected to an erosion test; soaked at room temperature for 16 One group is soaked in 20°C water, the other two sets are respectively soaked in 0.3% Na2SO4 and 3% Na2SO4 solutions, baked at 75°C for 7 hours, and cooled for 1 hour, as a cycle, a total of 28 cycles , then test the flexural strength of the mortar, and calculate its relative flexural strength K according to the following formula: K=the flexural strength of the mortar after circulating in sodium sulfate solution / the flexural strength of the mortar after the same circulation in tap water; the final test Results Relatively evaluate the anti-corrosion performance of mortar with K value.

[0010] The mortar specimens were carried out with reference to the method of...

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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...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N3/56
Inventor 周升任杰
Owner SHANGHAI SINO CARBIDE
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