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Concrete and its preparation method

A concrete and unit technology, applied in the field of building construction, can solve the problems of reducing the water-binder ratio, increasing the heat of hydration, increasing cementitious materials, etc., and achieve the effect of reducing construction costs

Active Publication Date: 2020-11-24
中国建筑土木建设有限公司
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Problems solved by technology

[0002] The strength of concrete is mainly determined by the strength of the transition zone. There are two ways to increase the strength of concrete. One is to increase the strength of the transition zone, which mainly corresponds to increasing the amount of cementitious materials and reducing the water-cement ratio. This is also the most commonly used method. method, the defects of this method are: 1. The internal heat of hydration in the concrete material increases, and the probability of other diseases such as cracks in the material increases; 2. While increasing the cementitious material, the slurry content is also increased, that is, the content of the transition zone is increased , to some extent weaken the effect of its strength enhancement

Method used

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  • Concrete and its preparation method
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  • Concrete and its preparation method

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preparation example Construction

[0029] The invention provides a method for preparing concrete. The concrete includes a slurry material and an aggregate material, the slurry material includes water, a cementitious material and an admixture, and the aggregate material includes coarse aggregate and fine aggregate. The preparation method of described concrete comprises the following steps:

[0030] S1: Determine the slurry content V per cubic meter of concrete p (%);

[0031] S2: Determine the water-binder ratio γ in the concrete mix, the amount of admixture ω (%), and the sand rate And the air content α (%) of concrete; Water-binder ratio γ, admixture dosage ω, sand rate And other parameters are determined according to the standard "Ordinary Concrete Mix Proportion Design Regulations".

[0032] S3: After determining the slurry content V p (%), concrete air content α (%), water-binder ratio γ, admixture content ω (%) and density ρ of water, cementitious material, admixture, fine aggregate and coarse aggreg...

Embodiment

[0060] Taking an actual project as an example, assuming that the air content of concrete is α=3%, the water-binder ratio is γ=0.32, and the sand ratio is Additive dosage ω=1%, suppose the densities of water, cementitious material, admixture, sand and stone are ρ w =1.0×10 3 kg / m 3 , ρ b =3.06×10 3 kg / m 3 , ρ a =1.06×10 3 kg / m 3 , ρ fa =2.62×10 3 kg / m 3 and ρ ca =2.72×10 3 kg / m 3 , the unit prices of water, cementitious material, admixture, sand and stone are P w = 5 yuan / ton, P b =317 yuan / ton, P a =3330 yuan / ton, P fa = 70 yuan / ton, P ca = 50 yuan / ton, then the relational expression between the concrete cost per cubic meter C (yuan / ton) and the slurry content is:

[0061]

[0062] like figure 1 Shown is a graph of concrete cost per cubic meter versus slurry content. For example, when the slurry content is 35%, the calculated cost per cubic concrete is 272.6 yuan, and the cost will drop by 3.809 yuan for every 1% reduction in the slurry content.

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Abstract

The invention provides concrete and a preparation method thereof. The method is characterized by comprising the following steps: S1: determining mortar content Vp(%) of concrete per cubic meter; S2: determining a water-cement ratio gamma, an admixture mixed amount omega (%) and a sand ratio phi (%) of proportioning of the concrete, and determining air content alpha (%) of the concrete; S3: calculating a mixing ratio of the concrete according to data obtained in step S1 and step S2, wherein parameters of the mixing ratio of the concrete comprise water, a cementing material, an admixture and aggregates, the aggregates comprise coarse aggregates and fine aggregates, and the content of the aggregates is 1-Vp(%); S4: preparing the concrete after a mixed material is prepared according to the mixing ratio obtained in step S3. According to the concrete and the preparation method thereof, provided by the invention, the content of a transition zone in a concrete material can be lowered through lowering the content of mortar so as to improve the strength of the concrete; meanwhile, the consumption of a cementing material is reduced, so that the construction cost of an enterprise is reduced.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a concrete and a preparation method thereof. Background technique [0002] The strength of concrete is mainly determined by the strength of the transition zone. There are two ways to increase the strength of concrete. One is to increase the strength of the transition zone, which mainly corresponds to increasing the amount of cementitious materials and reducing the water-cement ratio. This is also the most commonly used method. method, the defects of this method are: 1. The internal heat of hydration in the concrete material increases, and the probability of other diseases such as cracks in the material increases; 2. While increasing the cementitious material, the slurry content is also increased, that is, the content of the transition zone is increased , to some extent weaken the effect of its strength enhancement. Another method is to reduce the content of the tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/00C04B28/00
CPCC04B26/00C04B28/00C04B2201/50C04B14/02C04B14/06
Inventor 桂强陈艳明马明磊
Owner 中国建筑土木建设有限公司