Li Liangfeng pushed the bucket truck into the concrete forming chamber of the laboratory, and then put it down on a large iron plate, and the testing of the concrete working performance will be carried out on this iron plate, because the ordinary concrete ground does not meet the requirements of the specification, and the concrete working performance test must be on the rigid and non-absorbent ground щww{][lā}

Li Liangfeng is very hard-working, and now he is a tester in the laboratory, and the two testers he just recruited are still learning, so he can only give him a hand.

Li Ruoyu smiled: "Now how about we have a prize quiz?" If you are interested, as long as you guess the concrete slump, you will be rewarded! ”

Hearing that there was a prize to be won, Li Liangfeng and the two testers who had just graduated and were recruited became excited, and Qin Haijuan also smiled: "Okay, who doesn't want to win a prize, can I also participate?" ”

Li Ruoyu smiled: "Of course you can!" ”

Anna pulled Li Ruoyu's sleeve and said dissatisfiedly: "And me!" ”

Li Ruoyu smiled: "It's okay, it's just that you're all white and rich, and you still care about a little reward!" Whoever guessed the slump this time, the positive and negative errors are calculated in the range of 5 mm, and I will reward 100 yuan! ”

Li Liangfeng smiled and said, "Then I'll come first!" I guess the slump should be 120 mm! ”

Qin Haijuan thought for a while and said, "I guess 115 mm!" ”

Anna laughed and said, "Then I guess 115 mm too!" ”

The two novice testers guessed 125 mm and 130 mm respectively, it seems that the two of them still have their own opinions, and they did not conform to the herd, Li Ruoyu nodded with satisfaction and said: "Okay, you start the test, remember that the action must be standardized, Li Liangfeng, you come to explain to the two new employees!" ”

Li Liangfeng nodded and said, "Okay, Xiao Wang Xiao Liu, you are ready, do what I say." First mix the concrete I poured on the iron plate, and then the first step is to wet the slump cylinder and other utensils, and put the slump cylinder on the rigid horizontal bottom plate that does not absorb water, and then a person steps on the foot pedals on both sides with his foot to keep the slump cylinder in a fixed position when charging. ”

When the two novices saw that the boss was also there, they naturally did what Li Liangfeng said very carefully, although it was still a little jerky, but it was basically okay.

Li Liangfeng said: "According to the requirements, the concrete sample is evenly loaded into the cylinder in three layers with a small shovel, so that the height of each layer is about one-third of the height of the cylinder after tamping. Each layer is inserted 25 times with a tamper, and the tamper can be slightly inclined when the concrete on the edge of the tamper is inserted. When inserting the bottom layer, the tamper should run through the entire depth, and when inserting the second and top layers, the tamper should penetrate the surface of this layer to the next layer. When pouring the top layer, the concrete should be poured to the top of the cylinder opening. In the process of insertion, if the concrete settles below the cylinder mouth, it should be added at any time, and after the top layer is inserted, scrape off the excess concrete and smooth it with a spatula. ”

The two testers carefully did as required, Li Ruoyu nodded from time to time, he was quite satisfied with the two testers, Qin Haijuan saw that the two subordinates were doing well, and then Li Ruoyu seemed to be quite satisfied, so she was relieved, she was afraid that the two little guys would do something wrong and be embarrassed.

Li Liangfeng continued: "Okay, now after removing the concrete on the bottom plate of the cylinder side, lift the slump cylinder vertically and smoothly, and the lifting process of the slump cylinder should be completed within 5~10s. The whole process from the beginning of the charge to the lifting of the slump cylinder should be carried out uninterrupted and should be completed within 150s. After lifting the slump cylinder, the height difference between the height of the measuring cylinder and the highest point of the concrete test body after the slump is the slump value of the concrete mixture. After the slump cylinder is lifted, if the concrete collapses or one side is sheared, it should be re-sampled and measured. If the above phenomenon still occurs in the second test, it means that the workability of the concrete is not good. It should be recorded for future reference. ”

Sure enough, as soon as the slump barrel was lifted this time, the concrete collapsed slowly and evenly to the surroundings, and there was no collapse, so the workability of the concrete was good. After measurement, the slump was exactly 120 mm, so everyone except two novices guessed correctly, and even Anna guessed correctly.

Anna laughed and said, "Boss Li, give the money!" ”

Li Ruoxiang smiled and said: "Okay, Anna, I didn't expect you to guess correctly, okay, isn't it just a hundred yuan, I'll give it!" ”

After speaking, Li Ruoyu really took out a few hundred-yuan bills from his bag, one for each person, and only sent out three in total, which is really not much for Li Ruoyu.

Although there is not much money, everyone is very happy, especially Anna, although she is the daughter of a billionaire, but the money won from Li Ruoyu has a different meaning, so she is very excited.

Li Ruoyu smiled: "It's not over yet!" Li Liangfeng, you go on to say 1"

Li Liangfeng added: "Now you can observe the cohesion and water retention of the collapsed concrete specimen. The method of checking for cohesion is to gently tap the side of the collapsed concrete cone with a tamper. At this time, if the cone gradually sinks, it means that the cohesion is good, and if the cone collapses, partially cracks, or segregation, it means that the cohesion is not good. The water retention is evaluated by the precipitation of the slurry in the concrete mixture, and if there is more slurry precipitation at the bottom after the slump cylinder is lifted, and the concrete in the cone part is also exposed due to the loss of slurry, it indicates that the water retention of the concrete mixture is not good. If there is no slurry precipitation from the bottom after the slump is lifted, it means that the concrete mixture has good water retention. ”

Tester Xiao Wang Xiao Liu didn't guess right, his face was slightly disappointed, Li Ruoyu saw this and hurriedly encouraged: "Xiao Liu, Xiao Wang, you two don't be discouraged, in fact, the first time you guessed the concrete slump, you didn't follow the crowd, but based on your own observations to get your own judgment, so you should also be rewarded, come, one hundred, take it!" ”

After speaking, Li Ruoyu stuffed a hundred into the pockets of these two people, and the two testers didn't dare to take it, and wanted to take it out and return it to Li Ruoyu, but Li Ruoyu said: "Take it!" This is not a reward for guessing, but a reward for your serious attitude towards work! To do technical work, it is necessary to have your own judgment, and at the same time to be careful and meticulous, which you have done well, and you will continue to maintain it in the future, understand? ”

The two testers immediately felt flattered, and they were rewarded as soon as they came to work, and 100 yuan is a lot! Some students go to work in the cement factory and get an internship salary of 100 yuan in the first three months, and they not only have a salary of 3 or 400 yuan during the probation period, but also get a reward from the boss, how can this not make them feel lucky!

Xiao Liu's eyes were red with excitement at that time, and he whispered: "Mr. Li, I, we will work hard, you are really good to us!" ”

Xiao Wang also said excitedly: "Mr. Li, I don't know what to say, but I will devote myself to my work to ensure that our concrete inspection does not go wrong." ”

Li Ruoyu nodded and said: "Okay, you continue to test, in addition to the work performance test, but also to test the apparent density and gas content, and listen to Director Qin's instructions." (To be continued.) )