Mix proportion design method of high-stone-powder-content concrete containing waste limestone chippings

A technology of mixing ratio design and stone powder content, applied in the direction of ratio control, non-electric variable control, instruments, etc., can solve the problems of low comprehensive utilization rate of waste rock chip resources, loss of stone powder, secondary pollution, etc., and achieve significant social benefits and Economic benefits, improving concrete performance, and avoiding environmental damage

Active Publication Date: 2017-06-27
云南建投绿色高性能混凝土股份有限公司
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AI Technical Summary

Problems solved by technology

There are two main research and application results: one is to partially replace natural sand and machine-made sand with waste rock chips, which has a low comprehensive utilization rate of waste rock chips resources; The washing process is easy to cause secondary pollution, and a large amount of stone powder is lost during the washing process

Method used

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  • Mix proportion design method of high-stone-powder-content concrete containing waste limestone chippings
  • Mix proportion design method of high-stone-powder-content concrete containing waste limestone chippings
  • Mix proportion design method of high-stone-powder-content concrete containing waste limestone chippings

Examples

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Comparison scheme
Effect test

example 1

[0029] Taking the limestone waste rock concrete with strength grade C30 as an example, the concrete mix design is carried out according to the following steps:

[0030] ⑴According to the method stipulated in JGJ 52 of "Sand and Stone Quality and Inspection Method Standards for Ordinary Concrete", the stone powder content δ of 1# limestone waste rock chips is tested to be 13.8%, and the stone powder content limit δ 0 is 7.0%, calculate the stone powder excess value Δδ of 1# limestone waste rock chips, Δδ=δ-δ 0 = 13.8% - 7.0% = 6.8%;

[0031] ⑵According to the provisions of JGJ 55 in the "Ordinary Concrete Mix Proportion Design Regulations", the absolute volume method is used to calculate and determine the mix ratio parameters of C30 benchmark concrete, in which the fly ash and slag powder are respectively 15% and 20% of the total amount of cementitious materials %. The mix ratio parameters of the C30 reference concrete determined by the mix ratio calculation are as follows: c...

example 2

[0034] Taking C10 limestone waste rock concrete as an example, follow the steps of this design method to design the concrete mix ratio, and follow the steps below to design the concrete mix ratio:

[0035] ⑴According to the method stipulated in JGJ 52 of "Sand and Stone Quality and Inspection Method Standards for Ordinary Concrete", the stone powder content δ of 2# limestone waste rock chips was determined to be 17.7%, and the stone powder content limit δ 0 is 10.0%, calculate the stone powder excess value Δδ of 2# limestone waste rock chips, Δδ=δ-δ 0 = 17.7% - 10.0% = 7.7%.

[0036] ⑵According to the provisions of JGJ 55 in the "Ordinary Concrete Mix Proportion Design Regulations", the absolute volume method is used to calculate and determine the mix ratio parameters of C10 benchmark concrete, in which fly ash is 35% of the total amount of cementitious materials. The mix ratio parameters of the C10 reference concrete determined by the mix ratio calculation are as follows: ce...

example 3

[0039] Taking C55 limestone waste rock concrete as an example, follow the steps of this design method to design the concrete mix ratio, and follow the steps below to design the concrete mix ratio:

[0040] ⑴According to the method stipulated in JGJ 52 of "Sand and Stone Quality and Inspection Method Standards for Ordinary Concrete", the stone powder content δ of 3# limestone waste rock chips is tested to be 15.0%, and the stone powder content limit δ 0 is 7.0%, calculate the stone powder excess value Δδ of 3# limestone waste rock chips, Δδ=δ-δ 0 = 15.0% - 7.0% = 8.0%.

[0041] ⑵According to the provisions of JGJ 55 in the "Ordinary Concrete Mix Proportion Design Regulations", the absolute volume method is used to calculate and determine the mix ratio parameters of C55 benchmark concrete, and the amount of slag powder is 15% of the total amount of cementitious materials. The mix ratio parameters of the C55 reference concrete determined by the mix ratio calculation are as follo...

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Abstract

The invention relates to a mix proportion design method of high-stone-powder-content concrete containing waste limestone chippings. The method includes: testing and determining the stone powder content delta of the waste limestone chippings actually used in a project according to the method of Standard for technical requirements and test method of sand and crushed stone (or gravel) for ordinary concrete JGJ 52, and calculating the stone powder excess value Delta delta of the waste limestone chippings according to a stone powder content limit value delta 0; using an absolute volume method to calculate and determine the mix proportion parameters of reference concrete according to the regulations of Specification for mix proportion design of ordinary concrete JGJ 55; using the stone powder of the excess part in the waste limestone chippings as inert mineral admixture, calculating and determining a substitution cement amount according to a certain substitution coefficient K, keeping unit weight unchanged, and calculating and determining the mix proportion parameters of the concrete containing the waste limestone chippings. The mix proportion design method has the advantages that under the premise that concrete performance satisfies design and construction requirements, the technical difficulty of the waste limestone chippings with stone powder content exceeding standards in the field of concrete application is solved, the cement use quantity and production cost of the concrete are lowered, and energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention relates to the technical field of concrete preparation, in particular to a mixing ratio design method for limestone waste rock chip concrete with high stone powder content. Background technique [0002] In recent years, my country's basic engineering construction has continued to increase, the output of concrete has increased year by year, and the demand for sand and gravel for construction has also increased year by year. Sand and gravel aggregates, which account for more than 70% of the volume of concrete, are mainly obtained through mining and excavating riverbeds, which seriously damages the natural ecological environment. In many areas, there is a shortage of high-quality natural sand resources and a situation of soaring prices. [0003] Stone chips are finely crushed rock particles with a particle size of less than 4.75mm that are incidentally produced during the production of limestone crushed stones in mines or crushed stone proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00G05D11/00C04B14/28C04B18/08C04B18/141
Inventor 梁丽敏李章建李世华王模弼马敏超李翔田帅焦岩赵彦林培仁曹蓉何云桂进峰李锐姜敏
Owner 云南建投绿色高性能混凝土股份有限公司
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