Roller compacted concrete mix proportion design method for dam construction

A technology of roller compacted concrete and mix ratio design, which is applied in the field of roller compacted concrete, and can solve problems such as time-consuming, laborious, and poor results

Active Publication Date: 2019-04-05
大唐宣威水电开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the design of concrete mix ratio, practice has proved that the mix ratio of RCC designed according to the current "Regulations" does not meet the requirements of "the mix ratio should meet the requirements of engineering design Various technical indicators and construction process requirements" design principles, construction process requirements mainly include constructability, anti-separation ability and compactability, etc. In practice, when the design mix ratio does not meet the construction process requirements, it is necessary to recalculate the mix ratio It is time-consuming and labor-intensive, and the effect is not good.

Method used

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  • Roller compacted concrete mix proportion design method for dam construction
  • Roller compacted concrete mix proportion design method for dam construction
  • Roller compacted concrete mix proportion design method for dam construction

Examples

Experimental program
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Effect test

Embodiment 1

[0083] 1. Project overview

[0084] A roller compacted concrete dam has a maximum height of 88m and a crest length of 227m. Earthwork excavation 5.6 million m 3 , 446,000 m of concrete works 3 , including 360,000 m of roller compacted concrete 3. The mix ratio design unit is proposing six groups of three-grade RCC mix ratios, and recommends No. 6 mix ratio (see Table 4 for details) for on-site rolling test.

[0085] 2. Mixing ratio design unit mixing ratio design situation

[0086] 1. Raw materials

[0087] Cement: use 425 produced by Taiyuan Cement Factory # Ordinary cement, specific gravity (i.e. apparent density) ρ c =3030kg / m 3 ;

[0088] Fly ash: Fly ash from Shentou Power Plant, specific gravity ρ f =2240kg / m 3 ;

[0089] Fine aggregate: finished material processed from dolomite, specific gravity ρ s =2710kg / m 3 ;Tap bulk density γ s =1865kg / m 3 ;

[0090] Coarse aggregate: finished material processed from dolomite, specific gravity ρ g =2730kg / m 3 ;Ta...

Embodiment 2

[0180] Example 2: Roller compacted concrete arch dam

[0181] A roller compacted concrete double-curvature arch dam has a maximum height of 167.5m, an arc length upstream of the crest of 413.157m, a thickness of 9.00m at the crest, a thickness of 36.000m at the crown of the dam bottom, a thickness of 40.926m at the left arch end, and a thickness of 40.926m at the right arch end. The thickness is 40.8111m, the thickness-to-height ratio is 0.215, the arch dam is symmetrically arranged, and the roller compacted concrete is 1 million m 3 . The technical performance and construction control parameters of the RCC inside the dam body are proposed in the design, and the strength grade is C 180 25. The frost resistance index is F50, the impermeability grade is W6, and the ultimate tensile value is greater than 0.85×10 -4 . The construction unit has carried out two field tests successively, rolling 1-5 layers, rolling 6-10 layers for the first field test, rolling 11-14 layers, and ro...

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Abstract

The invention discloses a roller compacted concrete mix proportion design method for dam construction. The method comprises the following steps: designing required data by collecting a mix proportion;performing initial design of the mix proportion; performing trial mixing adjustment; determining an indoor mix proportion; converting the mix proportion of the construction site; and performing on-site rolling test and mix proportion adjustment. The roller compacted concrete mix proportion design method can well meet the design rule and requirements to achieve a desired aim. During the design ofthe mix proportion, five parameters, namely a concrete design gas content Vair, a cement fly ash net slurry enrichment coefficient alpha, a mortar enrichment coefficient beta, a coarse aggregate absolute volume Va and a slurry ratio PV, are used as calculation parameters; the five parameters of the mix proportion need to be controlled to meet reference values, so that the working performance of the concrete meets the requirement; and furthermore, the adjustment method is theoretically and practically verified to be feasible.

Description

technical field [0001] The invention belongs to the technical field of roller compacted concrete, and in particular relates to a method for designing the mix ratio of roller compacted concrete used in dam construction. Background technique [0002] Compared with normal concrete, hydraulic roller compacted concrete has its own characteristics. The roller compacted concrete mixture is super dry and hard, "dry" and "loose" mixture, has no slump, and has coarse aggregate from Problems such as separation in the mixture, poor layer flooding, and difficulty in filling the gaps in the slurry can easily lead to unevenness and insufficient compactness of the RCC, and indicators such as strength and impermeability are difficult to meet the design requirements. At present, most hydraulic RCC They are all glue-rich materials mixed with fly ash, and their strength performance complies with Li Siheng's water consumption principle, water-cement ratio rule and density rule. The compactness o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2111/00198C04B18/08C04B14/02C04B14/06
Inventor 颜玉明高宇李通盛
Owner 大唐宣威水电开发有限公司
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