Design method for determining formula of super early strength cement-based material

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 super-early-strength cement-based materials. Background technique [0002] With the rapid development of my country's infrastructure construction, cement-based materials have become the main building materials for airport pavements, highway bridges and industrial buildings. There are varying degrees of damage. For example, the expansion joints of urban bridges, under the repeated action of vehicles and the erosion of harsh environments, have become the parts of bridge structures that are generally damaged earlier, seriously affecting road transportation. The use of traditional expansion joint repair materials, due to the disadvantages of long process period and late opening of traffic, seriously affects urban traffic travel and also brings great losses to social and economic benefits. Now the country is vigorously develop...

AI Technical Summary

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

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