Special fine sand hydraulic large volume normal-state concrete

A technology for concrete and ultra-fine sand is applied in the field of hydraulic construction concrete, which can solve the problem that the resource reserve of coarse and medium sand cannot meet the construction scale, and achieve the effect of reducing dry shrinkage value and improving durability.

Active Publication Date: 2016-11-30
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a large-volume normal concrete for hydraulic engineering with ultra-fine sand, so as to solve the problem that the existing coarse and medium sand resource reserves cannot meet the needs of the construction scale

Method used

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  • Special fine sand hydraulic large volume normal-state concrete
  • Special fine sand hydraulic large volume normal-state concrete
  • Special fine sand hydraulic large volume normal-state concrete

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Embodiment 1

[0013] 1. Sand aggregate

[0014] In concrete, sand and gravel aggregates generally account for 80% to 85% of the total mass of concrete, and its quality has a significant impact on the physical and mechanical properties of concrete; "Construction Sand GB / T14684-2011" 4.2 "Specifications" stipulates: According to the fineness modulus, the sand is divided into three specifications: coarse, medium and fine. The fineness modulus is respectively: coarse sand—3.7~3.1; When the number is less than 1.6, it is unanimously named as ultra-fine sand in the industry. The sand and gravel aggregate used in this test is the natural river sand aggregate from the stockyard at the gate site of the Longxikou Navigation Power Project in Minjiang, Sichuan, as shown in Table 1.

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Abstract

The invention discloses a special fine sand hydraulic large volume normal-state concrete, wherein stirring of special fine sand is used, an admixture is added during the stirring process by using an external adding way, the sand ratio and the water-cement ratio are reduced, the stirring time is prolonged, and the early curing of the concrete is strengthened, wherein the admixture is a composite fiber expanding agent. According to the present invention, the externally adding of the composite fiber expanding agent is used, such that the sand ratio of the concrete of the present invention is improved by 3-5% compared to the sand ratio of the conventional special fine sand concrete; and with the improvement of the contents and the proportions of each index in the matching ratio, the reduction of the dry shrinkage value of the concrete, and the improvement of the durability of the concrete, the large number of the special fine sand can be used in the hydraulic large volume concrete.

Description

technical field [0001] The invention relates to the technical field of hydraulic construction concrete, in particular to an extra-fine sand hydraulic large-volume normal concrete. Background technique [0002] Concrete is one of the most widely used and used building materials in water conservancy projects, and sand is an indispensable resource for the preparation of concrete. General construction sand is mainly obtained through manual mining or mechanical crushing, and the rock particles with a particle size of less than 4.75mm after screening (according to the regulations of "Construction Sand", 2011 edition), are divided into natural sand and machine-made sand. kind. [0003] "Construction Sand" uses the fineness modulus index to limit the sand. Generally speaking, coarse, medium and fine sand with a fineness modulus between 1.6 and 3.7 are in line with the use standards, and the surface of the sand in concrete It needs to be wrapped by cement slurry. The larger the tot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B18/08C04B14/06C04B14/04C04B2103/302C04B2103/304C04B2103/0068
Inventor 李勇谭建军饶承彪田小岩杨金娣王建琦
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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