The quality inspection of high-temperature cement after curing is an important link to ensure the construction quality. The following are the main methods and acceptance criteria for quality inspection after curing:

I. Visual inspection

Surface flatness: The surface of the cured cement should be uniform and smooth, without obvious cracks, shedding or accumulation.

Treatment of excess glue: the excess glue on the construction surface should be removed to ensure the surface is clean and tidy.

II. Thickness detection

Thickness uniformity: use an electromagnetic thickness gauge to detect the thickness of the cured cement to ensure that it meets the design requirements. At least 3 points should be detected per square meter, and the thickness should meet the design requirements.

III. Air tightness inspection

Air compression test: the air tightness of the cured cement should be checked. Brush soap solution along the sealing mortar, and press compressed air from the glue injection nozzle (the pressure is equal to the glue injection pressure) to observe whether there are air bubbles leaking. If there is air leakage, it needs to be repaired with cement until no bubbles appear.

IV. Testing of bond strength

Tensile strength test: the standard tensile test method can be used to test the tensile strength of the cured cement. The test results should meet the design requirements.

Positive tensile bond strength detection: For the reinforced structure, the positive tensile bond strength detection method can be used to ensure that the bond strength between the cement and the base material meets the standard.

V. Durability test

Temperature resistance test: the temperature resistance of the cured cement is tested by temperature shock test (such as -50℃ to 200℃) to ensure its stable performance at extreme temperatures.

Acid resistance test: Soak the cured cement sample in concentrated sulfuric acid (concentration ≥80%) for 30 days, and then test the tensile and bond strength to ensure its acid resistance.

VI. Internal quality inspection

Ultrasonic testing: For concrete members or similar structures, ultrasonic testing can be used to test the internal quality of cured cement to ensure that there are no cavities or defects in it.

Coring method detection: randomly drill core samples with a diameter of not less than 50mm, and check whether the cracks in the core samples are filled with colloid tightly, fully and cohesively.

VII. Evaluation of results

Appearance quality: the surface should be free of cracks and shedding, and the construction residue should be removed.

Strength evaluation: splitting tensile strength should be used for core sample detection. The damage should occur inside the concrete, or the damage area of the crack interface is not more than 15%.

Air tightness evaluation: there is no air leakage under the pressure of 0.4MPa.

Through the above inspection methods and acceptance criteria, the quality of high-temperature cement after curing can be comprehensively evaluated to ensure its reliability and durability in practical application.