Method for comprehensively utilizing waste concrete and seawater sea-sand with low energy consumption

Abstract

The invention discloses a method for comprehensively utilizing waste concrete and seawater sea-sand with low energy consumption. The method comprises following steps: step one, preparation of a pipe constrained LC-SSRC (light aggregate concrete-seawater sea-sand recycled concrete) mixture component: bulk waste concrete blocks and recycled coarse aggregate are prepared from collected waste concrete; seawater sea-sand recycled concrete is prepared from the recycled coarse aggregate, seawater sea-sand and cement; the seawater sea-sand recycled concrete and the bulk waste concrete blocks are alternately fed into a pipe and subjected to vibratory compaction and maintenance , and the pipe constrained LC-SSRC mixture component is prepared; step two, formation of a superposed member: the pipe constrained LC-SSRC mixture component is hoisted and positioned, peripheral concrete is poured after external reinforcements are bound or external steel pipes are positioned, and the superposed member isformed. According to the method, a tedious production process of the recycled coarse aggregate is simplified, a large amount of energy consumed by processes of crushing, sieving and purifying the waste concrete component is saved, meanwhile, water resources are saved, and the problem of shortage of river sand in the coastal regions is solved.

Description

technical field [0001] The invention relates to the field of low-energy utilization of waste concrete and seawater and sea sand, in particular to a method for comprehensive utilization of waste concrete and seawater and sea sand with low energy consumption. Background technique [0002] According to the data of the National Bureau of Statistics, the completed area of ​​housing in my country has experienced rapid growth since 2005, and since 2014, the annual completed area has basically stabilized at around 4.2 billion m2. While the construction industry is developing steadily, concrete, as the most used building material, requires large-scale mountain quarrying and river sand mining, which brings a lot of environmental problems. With the improvement of national environmental protection requirements, some areas began to prohibit the collection of river sand and mine blasting, resulting in a shortage of coarse and fine aggregates required for the preparation of concrete. Corr...

AI Technical Summary

Problems solved by technology

With the improvement of national environmental protection requirements, some areas began to prohibit the collection of river sand and mine blasting, resulting in a tight supply of coarse and fine aggregates required for the preparation of concrete

Correspondingly, in my country, a large amount of waste concrete is produced every year due to building demolition and concrete production, but its resource utilization rate is only about 5%, resulting in it occupying a large amount of land, polluting the environment, and costing treatment costs At the same time, there are abundant sea sand reserves that can be used for building aggregates near the coast of my country, but due to the harmful substances contained in sea sand will affect the durability of reinforced concrete structures, its practical application is less

[0003] At present, one of the main directions for resource utilization of waste concrete is to produce recycled coarse aggregate, but the process of crushing waste concrete into recycled aggregate consumes a lot of energy and causes serious noise and dust pollution.

Repeated crushing of waste concrete will also cause a decline in its mechanical properties, affecting the use effect

However, increasing the use of sea sand also has the problem that it takes a long period to remove chlorine salt in sea sand, and consumes a lot of fresh water and other energy sources.

The above reasons restrict the domestic use of waste concrete and sea sand

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