High-performance lightweight aggregate concrete

Abstract

The invention discloses high-performance lightweight aggregate concrete. The high-performance lightweight aggregate concrete is characterized in that: high-performance porcelain granules are taken as lightweight aggregate; and the high-performance lightweight aggregate concrete is prepared by mixing the following raw materials in proportion: 400 to 430 kg / m<3> of cement, 500 to 570 kg / m<3> of high-performance porcelain granule, 40 to 55 kg / m<3> of fly ash, 40 to 55 kg / m<3> of grounded furnace slag, 540 to 565 kg / m<3> of sand, 180 to 185 kg / m<3> of water and 6 to 10 kg / m<3> of water reducing agent, wherein the performance indexes of the high-performance porcelain granule is that stacking density is less than and equal to 700 kg / m<3>, cylinder pressure strength is greater than and equal to 6.0 MPa, strength mark is greater than and equal to 35 MPa and water absorbing capacity is less than and equal to 1.0 percent. The high-performance lightweight aggregate has the advantages that the strength is high, and workability and pumpability can meet design and construction requirements.

Description

technical field [0001] The invention relates to a lightweight aggregate concrete, in particular to a high-performance lightweight aggregate concrete. Background technique [0002] Light aggregate concrete refers to the dry apparent density not greater than 1950kg / m3 prepared with light coarse aggregate, light sand (or ordinary sand), cement and water. 3 of concrete. [0003] At present, light aggregate concrete is widely used in industrial and civil buildings and other projects, which can reduce the self-weight of the structure; improve the seismic performance of the structure; reduce the foundation load and improve the building function (insulation and fire resistance, etc.) It has the advantages of good thermal insulation, fire resistance and shock resistance, and good deformation performance. [0004] However, the disadvantages of the existing lightweight aggregate concrete, such as poor working performance and poor pumpability, make it difficult to meet the technical r...

AI Technical Summary

Problems solved by technology

The porous lightweight aggregate will continuously absorb the water in the cement slurry during the transportation, storage and construction of the mixture, which will reduce the free water in the concrete mixture and cause the fluidity of the mixture to decrease; however, the increase in fluidity will correspondingly Increase the risk of concrete segregation; at the same time, because the higher the stability of the concrete, the greater the cohesion, which will inevitably lead to a decrease in the fluidity of the concrete, and the light aggregate has a smaller density to coordinate the solution between fluidity and stability. The contradiction between has greater technical difficulty

[0006] Because light aggregate has a higher water absorption rate than ordinary coarse aggregate, the water absorption of light aggregate will further increase under the action of pumping pressure, resulting in a decrease in the slump of the concrete mixture and an increase in the flow resistance of the mixture. , block the pump pipe; if the pressure release occurs at the pouring site, the extruded moisture will be wrapped on the surface of the light aggregate, affecting the interface between the light aggregate and the cement stone, and destroying the bond between the cement stone and the aggregate, thereby affecting the performance of the concrete , causing problems such as loss of concrete strength and poor durability

[0007] The lack of high-strength and high-performance lightweight aggregates makes some large-scale construction projects lack sufficient raw material supply, and the lack of performance also makes it difficult for the strength, workability and pumpability of lightweight aggregate concrete to meet design and construction requirements.