Method for determining effective porosity of pervious concrete

Abstract

The invention relates to a method for determining an effective porosity of pervious concrete, in which a test process is economic, convenient and rapid, and belongs to the technical field of testing of an effective porosity of pervious concrete. The method is mainly characterized by comprising the following steps: determining mass m1 of each test piece in water, adopting a handheld electronic scale and a mesh bag, putting the test pieces which are soaked for 24 hours into the mesh bag, completely soaking in water, packing up a knot on mesh bag opening, resetting the electronic scale, hooking up the rope knot through a scale hook, observing a fixed display value on scale, i.e., mass m1 of the test pieces and the mesh bag in the water, after being stable, and deducting mass 3 of the mesh bag in the water, so as to obtain mass (m1-m3) of the test pieces in the water. The method disclosed by the invention is simple and convenient to operate; the method has the beneficial effects that an average error therebetween is 1.43%, so that the method meets a precision requirement preset by the test, and the special method can rapidly determine mass of pervious concrete test block in the water in a test room or a construction field, so as to calculate the effective porosity of the pervious concrete test block through a formula; the method not only greatly reduces test equipment cost, but also is convenient and rapid, and is easy to popularize and use.

Description

technical field [0001] The invention relates to a method for measuring the effective porosity of permeable concrete, which makes the test process economical, convenient and fast, and belongs to the technical field of effective porosity testing of permeable concrete. Background technique [0002] There is no uniform national standard for the existing method of measuring the effective porosity of permeable concrete test blocks, and generally refer to the "Technical Regulations for Permeable Concrete Pavement" (DB11 / T775-2010) to operate. The instruments and equipment mainly used in this method are electronic hydrostatic balance, container and oven. Prepare 3 pieces of standard test pieces, put them in an oven at (105±5)°C and bake them to constant weight, take them out and cool them to room temperature in a desiccator, measure the size of the test pieces with a vernier caliper, and calculate the volume V. Immerse the specimen in water completely, and measure the weight of the...

AI Technical Summary

Problems solved by technology

According to the above method to measure the effective porosity of the permeable concrete test block, you need to use a hydrostatic balance, and this kind of equipment is relatively expensive, and the lower hanging basket needs to be refitted to hold the standard test block, and it is inconvenient to carry, which is not conducive to rapid determination of the test block. mass of block in water