Preparation method of high volume stability concrete

Abstract

The invention discloses a preparation method of high-volume stable stability concrete, and the high-volume stability concrete is mainly applied to a high-temperature and dry environment. The high-volume stable concrete comprises the following components in a mix proportion: 900-1200 kg / m<3> of rubbles, 500-800 kg / m<3> of river sand and 300-500 kg / m<3> of binding material, wherein the mixing amount of an efficient water reducing agent is 0.3-1.2%; the water-binder ratio value is 0.2-0.5; the rubbles are obtained by mixing rubbles in three granularity ranges in proportions; the river sand consists of river sand in two granularity ranges; the binding material is composed of Portland cement, superfine slag powder and coal ash. The concrete provided by the invention has a higher aggregate stacking density (65-75%), so that the using amount of the binding material is reduced, the proportions of admixtures such as slag and coal ash are higher, the segregation resistance, bleeding capacity and early-stage volume stability (particularly plastic shrinkage crack resistance) of the concrete are obviously improved, and the later volume deformation (self-constriction and drying shrinkage) of the concrete is smaller; the preparation method is particularly suitable for preparing C30-C50 grade concrete applied in high-temperature and dry regions.

Description

technical field [0001] The invention relates to a method for preparing concrete, in particular to a method for preparing concrete with high volume stability, which is mainly used in high temperature and dry environments. Background technique [0002] With the continuous development and growth of my country's construction enterprises, the amount of overseas projects has increased significantly. For example, our company (Suzhou Sinoma Construction Co., Ltd.) has undertaken dozens of cement production line construction projects in the United Arab Emirates, Saudi Arabia, Iraq, Sudan, Angola and other North Africa and Middle East regions. Concrete (especially mass concrete) projects occupy these A considerable proportion in construction, its quality directly affects or determines the quality and service life of the entire engineering construction. In high-temperature and dry areas such as North Africa and the Middle East, European standards are basically adopted for architectura...

AI Technical Summary

Problems solved by technology

The hydration and hardening speed of concrete at high temperature is too fast, resulting in premature concrete setting, large early autogenous shrinkage, and severe plastic cracking

In a dry environment, the moisture loss of concrete is greater, resulting in greater capillary stress and greater drying shrinkage, which increases the risk of concrete cracking

The temperature difference between day and night in North Africa, the Middle East and other regions can reach more than 30 degrees Celsius. The environmental temperature difference over the years makes the concrete structure gradually fatigue, and the temperature stress makes the concrete cracks gradually expand, which eventually leads to poor durability of the concrete structure and a greatly shortened service life.

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