A test method for the anti-scouring performance of hydraulic concrete

Abstract

The invention provides a method suitable for measuring erosion abrasion resistance of hydraulic concrete. The method comprises: putting concrete aggregate with a particle size of 40 mm or less on a vibration table for vibration demolding, and putting in a standard curing room to cure to a specified age; immersing a test piece in water for 48-52 h, removing water and weighing; grading a punching and grinding medium: choosing 25 steel balls with a diameter of 12.7 mm and cut circle hexahedral steel balls, wherein the cut circle hexahedral steel balls comprise 35 cut circle hexahedral steel balls with a diameter of 19.1 mm, 17 cut circle hexahedral steel balls with a diameter of 25.4 mm and 8 cut circle hexahedral steel balls with a diameter of 30.0 mm; performing cutting on the hexahedral steel balls according to 5% of the corresponding steel ball diameter, so as to obtain the hexahedral steel balls with corner angles; and operating instrument: adjusting the distance between a stirring paddle and the test piece to 33-45 mm, adding water until the water face is higher than the test piece surface by 162-168 mm, stirring and punching and grinding under the condition of 1200 r / min for 72 h, taking out the test piece, cleaning, removing water and weighing for obtain a test piece according with standards.

Description

technical field [0001] The invention relates to a hydraulic anti-abrasion and wear technology, which is especially used for the indoor anti-abrasion and wear-resistant test of hydraulic concrete, and is suitable for the experimental study of the impact and wear of bedrock on hydraulic concrete water-passing buildings. Background technique [0002] The current "Hydraulic Concrete Test Regulations" SL352-2006 and DL / T5150-2001 have test methods for the abrasion resistance of cement concrete, one of which is the underwater steel ball method, which mainly specifies the following parameters , one is the gradation and size of the underwater steel ball; the second is the rotation speed of the anti-scour mill; the third is the time of the grinding. Therefore, in actual engineering, the sand and gravel contained in the high-speed water flow are mainly rolling stones, which are the most serious to the abrasion of concrete, while the amount of large-diameter steel balls in the current ...

AI Technical Summary

Problems solved by technology

Therefore, in actual engineering, the sand and gravel contained in high-speed water flow are mainly rolling stones that have the most serious abrasion on concrete, and the amount of large-sized steel balls in the current specification is too small, which affects the effect of the abrasion test; secondly, in the current specification The steel balls in the underwater steel ball method are all smooth balls, the number of steel balls is 10, 35, 25; the diameters are Φ25.4±0.1; Φ19.1±0.1; Φ12.7±0.1

This also does not conform to the shape of the actual rolling stone with many edges and corners, which will inevitably affect the test results and have a large gap with the actual situation

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