In the past two days, Li Lei and Luo Lianghua have followed two engineers from the manufacturer to install and debug the production line equipment and operating system. They also have a preliminary understanding of the concrete production process. It sounds simple, but they still don't know how to actually operate it.
Commercial concrete actually has a relatively low technical threshold. Several raw materials, including cement, admixtures, sand, stone, water and admixtures, are six major components. According to the set mix ratio, after completing the measurement, press
The designed sequence enters the mixing host, and after mixing for a certain period of time, it is put into the concrete mixer truck and pulled to the construction site.
Today, Li Lei doesn't know much about concrete mix proportions. Although he took concrete technology courses in school, his knowledge is still in the past, when concrete is mixed on site.
So now he basically needs to learn from scratch. The job responsibilities of an operator are not only to operate the mixing plant equipment, but also part-time scheduling work and part of the tester's work, such as filling in the mix ratio report. Of course at this time
I still wrote it all by hand, and visually inspected the working performance of the concrete, etc.
In fact, these jobs require experience. However, the commercial concrete industry has just emerged a few years ago, and it is difficult to find experienced people. However, this also gives college graduates like Li Lei an opportunity.
Otherwise, Li Leizhen would not be able to find a suitable job and would have to sit on the assembly line where talents are buried.
After lunch today, Li Lei and Luo Lianghua were called to the laboratory by the director.
It turns out that today we need to do a lot of concrete mix proportion tests, from the lowest strength grade C10 to the highest strength grade C55, as well as some special mix proportions, such as impermeable concrete, flexural concrete, etc.
Li Lei is still not very clear about the purpose of doing concrete mix proportion testing and how to do it.
There are only two testers in the laboratory now, plus Li Lei and the two operators, there are four people.
Director Zhang Jianzhong looked at his four subordinates and said with a smile: "Today we are going to do another mix ratio verification test, because we are going to trial production soon, and everyone doesn't know much about concrete mix ratio design. What about you today?
In terms of actual operation, I believe everyone should have no problem with this job. I have calculated the basic mix ratio and the amount per plate. You only need to weigh the raw materials according to the amount per plate, and wait until they are mixed.
According to the requirements of the standard specification, the concrete working performance test is carried out. The test items include slump, bulk density, and molding. They are all relatively simple, so now everyone is ready to start working!"
As he spoke, Zhang Jianzhong began to assign tasks. Li Lei, who was strong, and tester Xiaopang were mainly responsible for testing the working performance of concrete. Luo Lianghua, who was small, and another female tester Qian Juan, were responsible for weighing raw materials.
A few young people were very agile and quickly mixed the first plate of concrete, which was used to verify the C10 concrete mix ratio.
Director Zhang Jianzhong guided the experiments while explaining the basic knowledge of concrete to everyone. Now is the best opportunity, because usually there is no actual operation, and it is not easy to understand just by talking, but now it is much better.
For example, what is the workability of concrete? When Li Lei raised the slump cylinder, Xiaopang took a ruler, measured it and said: "Director, the slump is 120 millimeters!"
Zhang Jianzhong smiled and said: "Yes, the slump value is exactly the same as our design, which means that there is no problem with our visual inspection just now, and the mix design is basically OK. But as you can see, C10 concrete is the lowest grade concrete.
So it doesn’t work very well!”
As he spoke, Zhang Jianzhong picked up the tamping stick and gently tapped twice on the concrete pile that had just been tested. Then the concrete collapsed and fell to one side.
Zhang Jianzhong looked at Xiaopang and said with a smile: "Xiaopang, tell me why."
The fat guy’s name is Ma Liang, but no one calls him by his name. They all call him Fatty. This guy is indeed fat enough, weighing two hundred pounds. It is said that he is a relative of the boss, so he is also the target of Zhang Jianzhong’s training.
Xiaopang was the first to come, it has been four months, and he has been with the director every day and learned a lot of professional knowledge.
At this time, the guy looked at Li Lei and Luo Lianghua, and replied with some pride: "This is because the amount of C10 concrete cementitious material is small, so there is relatively less slurry in the concrete mixture, and there is not enough
After the slurry is filled and lubricated, the working performance of the concrete will naturally be poor. However, this kind of concrete is generally only used as a cushion, so the working performance requirements are not high, so it is fine in this state!"
Zhang Jianzhong said with satisfaction: "What Xiaopang said is right, everyone should remember it. Especially Li Lei and Luo Lianghua, you two will not only operate in the future, but also learn to visually detect the slump and working performance of concrete. If you see
If it is not accurate, then you are not a qualified operator. You have three months. If the probation period is over and you have not met the requirements, you will have to be eliminated according to the company's requirements."
Hearing this, Li Lei felt a little uneasy again, because now he really didn't know whether he could see accurately. After all, it was different to do experiments upstairs in the operation room and in the laboratory now.
, you can only see the concrete falling from the discharge port of the mixer into the hopper of the concrete mixer truck for only ten seconds. How can you see it accurately with your eyes?
If you are not accurate, the consequences seem to be a bit serious, because whether the slump of the concrete is too large or too small, if it is pulled to the construction site, it is very likely to be returned, or even more serious, it will also affect the company's
image.
Li Lei and Luo Lianghua were frightened when they heard this from the director these days. What if they do not perform well in the future and the concrete is returned to the construction site? The company will also deduct wages!
To be more serious, if a certain truck or even several trucks of concrete are scrapped because the operator did not look correctly, then the concrete cannot be compensated even if a month's salary is deducted.
Now Li Lei knows that this operator is not that easy to work! If he doesn't do well and is fired by the company, then how can he have the honor to go back!
No! You must learn, there is no way out, Li Lei secretly made up his mind.
Then Li Lei put the concrete into a metal bucket and began to test the concrete's bulk density.
Li Lei has memorized all the standards and regulations in the past few days, so there are basically no problems in operation. Zhang Jianzhong praised: "Li Lei did a good job, every action is very standardized, we just need to do it strictly according to the standards.
Only in this way can the most accurate test data be obtained.”