Technical Analysis of Strength Deviation of Prefabricated Steamed Square Pile

After the cement is mixed with water, due to the molecular gravity of the cement particles, the cement slurry forms a flocculated structure, so that 10% to 30% of the mixing water is wrapped in the cement particles, which cannot participate in the free flow and lubrication, thus affecting the fluidity of the concrete mixture. When the water reducing agent is added, the water reducing agent molecules can be adsorbed on the surface of cement particles, so that the surface of cement particles with the same charge (usually negative charge), the formation of electrostatic repulsion, promote the mutual dispersion of cement particles, flocculation structure destruction, release part of the wrapped water, participate in the flow, so as to effectively increase the fluidity of concrete mixture.

Technical Analysis of Strength Deviation of Prefabricated Steamed Square Pile

With the vigorous promotion of PC construction, the factory prefabrication of assembly structure construction is increasing day by day, reducing the dirty and poor environmental pollution and slow construction speed on site. To further enhance the development of concrete. But at the same time, it also brings some difficulties to the production technology. Because all the production of concrete construction is basically prefabricated and produced in the factory building, it brings certain difficulties to the turnover of concrete formwork, curing cycle and even the strength development of concrete. How to solve the contradictions and difficulties of production and technology, a brief talk.

Concrete admixture

According to the main function of the admixture in the national standard GB8075-87, the concrete admixture is divided into four categories 1. Admixtures to improve the rheological properties of concrete mixtures, including various water reducing agents, air entraining agents and pumping agents. 2. Admixtures to adjust the setting time and hardening performance of concrete, including retarder, early strength agent and accelerator, etc. 3. Admixtures to improve the durability of concrete, including air-entraining agents, waterproofing agents and rust inhibitors. 4. Admixtures to improve other properties of concrete, including air entraining agents, expansive agents, antifreeze agents, colorants, waterproofing agents and pumping agents.

The importance of concrete admixture to concrete quality!!!

Under normal circumstances, people will be in the mixing process and before the mixing of concrete to improve the performance of concrete substances are collectively referred to as admixtures. The quality of admixtures mixed into concrete shall generally not be greater than 5% of the cement quality. Retarder, accelerator and early strength agent can adjust the hardening performance and setting time of concrete. The main function of admixtures such as air-entraining agent, water-reducing agent and pumping agent is to improve the rheological properties of the concrete mixture, making it easier to be pumped to the designated location. Admixtures such as waterproofing agent, air-entraining agent and rust inhibitor are used to improve the durability of concrete. In order to improve other properties of concrete, it is necessary to incorporate admixtures such as colorants, air entraining agents, anti-freezing agents, and expansion agents into concrete.

How to classify concrete admixture

Concrete admixtures (English: concrete admixtures) referred to as admixtures, refers to the mixing of concrete before mixing or mixing process to improve the performance of concrete material. The dosage of concrete admixture is generally not more than 5% of the cement quality.

Mistakes in the use of concrete admixture

Concrete admixture is an indispensable part of modern concrete, and it is also a method and technology of concrete modification. It can improve the physical and mechanical properties of hardened concrete, improve the quality and durability of building components, save cement, reduce costs and speed up the progress of the project. With the development of modern buildings to high-rise buildings and the development of ready-mixed concrete to concentrated mixing, the application of concrete admixtures is becoming more and more extensive, but if the application of admixtures is improper, it often fails to achieve the expected results, or even quality accidents.