Reversed filtration block prepared from coal slag or mineral slag and preparation method thereof

Abstract

The invention relates to a reversed filtration block prepared from coal slag or mineral slag and a preparation method thereof. The reversed filtration block is prepared from, by weight, 100 parts of cement and 700 to 750 parts of coal slag or mineral slag. The preparation method for the reversed filtration block comprises the following steps: A, crushing 700 to 750 parts of the coal slag or mineral slag into slag blocks with a size of 10 to 100 mm, wherein the content of slag blocks with sizes of less than 10 mm is 10 to 20%; B, adding water into the two raw materials uniformly mixed in the step A and carrying out stirring so as to obtain a mixture; C, pouring the mixture prepared in the step B into a die and carrying out pressing with a brick press at a pressure of 0.5 to 1.5 Mpa so as to prepare a square reversed filtration block with insertion holes; and C, demolding the molded reversed filtration block, standing the molded reversed filtration block at normal temperature for 3 to 4 h and sprinkling water to cover the block for maintenance for 28 to 35 d after eventual solidification of cement, wherein the prepared reversed filtration block has compressive strength of 0.25 to 0.5 Mpa. The invention has the following advantages: the preparation method is simple, economic and practical, utilizes the waste, realizes low carbon and environmental protection and can improve construction progress and engineering.

Description

technical field [0001] The invention relates to a reverse filter block made of coal slag or slag and a preparation method thereof, which is suitable for slopes, roadbeds, dams and the like. Background technique [0002] In the design of the building slope retaining wall project, one or more rows of drainage holes are set in the retaining wall according to the size of the water volume and at intervals of 2 to 3m in the shape of plum blossoms according to the requirements of the code. Its function is to drain the soil behind the wall. The groundwater in the rock is used to reduce the active earth pressure of the retaining wall and ensure the safety of the retaining wall. Drainage holes are generally located in the middle and lower part of the retaining wall, and fillers with strong water permeability are selected to be filled behind the wall. Drain holes and fillers together form the drainage system of the retaining wall. Usually, at least 0.5m thick sand filler is filled b...

AI Technical Summary

Problems solved by technology

In addition, the sand is directly connected to one side of the drainage pipe, some of the sand will be directly taken away by the seepage water, and a small amount of sand will slip directly from the outwardly inclined drainage holes and become a direct channel for the flowing soil, resulting in the filling of the wall behind the wall. The soil was washed out, the slope retaining wall was deformed, and even collapsed and damaged, causing quality and safety incidents

[0003] Pile anti-filter bags on the inside of the drainage pipe behind the wall. This method is cumbersome to construct, the bag body is easily deformed and damaged, and the construction quality is difficult to control. The slow construction affects the progress and the cost is also high.

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