RCC mix 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, can solve problems such as time-consuming, laborious, and poor results, and achieve the effect of saving investment

Active Publication Date: 2021-08-31
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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  • RCC mix design method for dam construction
  • RCC mix design method for dam construction
  • RCC mix design method for dam construction

Examples

Experimental program
Comparison scheme
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, the maximum dam height is 167.5m, the upstream arc length of the dam crest is 413.157m, the thickness of the dam crest is 9.00m, the thickness of the arch crown at the bottom of the dam is 36.000m, the thickness of the left arch end is 40.926m, and the thickness of the right arch end is 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, rolli...

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Abstract

The invention discloses a method for designing the mix ratio of roller compacted concrete used in dam construction. The data required for the mix ratio design are collected; the preliminary design of the mix ratio is carried out; the trial mixing is adjusted; the indoor mix ratio is determined; and the mix ratio is converted on the construction site ; The on-site rolling test and the adjustment of the mix ratio can better meet the design principles and requirements and achieve the expected purpose. When designing the mix ratio, the design air content of concrete V air , Cement fly ash net slurry rich coefficient α, mortar rich coefficient β, coarse aggregate absolute volume V a and slurry ratio P V Five parameters are used as calculation parameters. It is necessary to control the five parameters of the mix ratio to meet the benchmark value, so that the working performance of the concrete meets the requirements, and the adjustment method is proved to be feasible in theory and practice.

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 & AuthorityPatents(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