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A design method for determining the formulation of super early strength cement-based materials

A technology of early-strength cement and design method, which is applied in the field of building materials, can solve problems such as shortage and difficulty in controlling the reasonable dosage of admixtures, and achieve the effects of improving performance, optimizing design, and simple operation

Active Publication Date: 2021-03-16
CHINA RAILWAY BRIDGE SCI RES INST LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no sufficient theoretical support and basis for the design of ultra-early-strength cement-based materials, and in engineering applications, due to the influence of construction technology and construction period, the reasonable dosage of admixtures in the ultra-early-strength cement-based material system also difficult to control

Method used

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  • A design method for determining the formulation of super early strength cement-based materials
  • A design method for determining the formulation of super early strength cement-based materials
  • A design method for determining the formulation of super early strength cement-based materials

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Embodiment 1

[0052] A formula design method for an ultra-early strength cement-based material, comprising the following steps:

[0053] S1: Determine the mass of each solid component in the matrix of the ultra-early-strength cement-based material per cubic meter according to the close packing theory. The results are shown in Table 1:

[0054]Table 1. Substrate mix ratio of super-early-strength cement-based materials (kg / m 3 )

[0055] composition cement Mineral admixture Aggregate(0~0.6mm) Aggregate (0.6~3.35mm) quality 900 200 600 400

[0056] S2: Determine the water-binder ratio of the super-early-strength cement-based material to be 0.2.

[0057] S3: According to the compatibility between the matrix and the superplasticizer, the mass content of the polycarboxylate superplasticizer is determined to be 1.6% of the mass of the gel material; in this example, the gel material is cement and mineral admixtures.

[0058] S4: The response surface method is used,...

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Abstract

The invention discloses a design method for determining the formula of a super early strength cement-based material. The method comprises the following steps: determining the solid component proportion of a matrix according to a dense packing theory; determining a water-to-binder ratio; determining the mixing mass of a water reducer; determining an investigation factor and a response target basedon a response surface technology, designing test, and calculating the best theoretical value of the investigation factor by using a model fitted according to the obtained test result; and adding fibers with different volumes and determining the best volume of the fibers based on the mass content of each component of the super early strength cement-based material, obtained in the above steps, in order to obtain the formula of the super early strength cement-based material. The ratio of the super early strength cement-based material with the ability to maintain excellent workability and mechanical properties is obtained by optimizing the proportion of the matrix and the mass content of the investigation factor. The method is simple to operate, can accurately determine the reasonable ratio ofcomponents needed by the super early strength cement-based material, and provides a basis for the precise design of the performances of the super early strong cement-based material.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a design method for determining the formula of ultra-early strength cement-based materials. Background technique [0002] With the rapid development of infrastructure construction in my country, cement-based materials have become the main building materials for airport pavements, highway bridges and industrial buildings. However, many concrete building structures are prone to damage during service, and have not even reached the design period. There are varying degrees of damage. Such as urban bridge expansion joints, under the repeated action of vehicles and the erosion of harsh environments, has become a common early damaged part of the bridge structure, which has seriously affected road transportation. However, the traditional expansion joint repair materials have the disadvantages of long construction period and delayed opening of traffic, which seriously affects ur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2201/50C04B14/48C04B18/146C04B18/08C04B18/141C04B14/28C04B14/365C04B22/064C04B14/06C04B20/0076C04B2103/302C04B2103/12C04B2103/22
Inventor 张志豪陈露一吴美艳黄有强李信郑丽许婷杨剑寒秦岭陈鑫
Owner CHINA RAILWAY BRIDGE SCI RES INST LTD
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