Anna and Lars glanced at each other, and they both saw a kind of trust in Li Ruoyu in each other's eyes, as well as expectations for investment.

Anna chuckled: "Of course there is no problem, our Shi Weiying company originally planned to enter the Chinese market, but it is just a matter of the way to enter, Li, the way you said is very good." We are equivalent to several parties to cooperate to build a large-scale concrete machinery company belonging to China. I will try my best to get in touch with the company and the family. ”

Lars also nodded and said, "Well, and I, Lars." I believe that these projects are very good and the return on investment should be substantial. I believe in you, Lee! ”

Bai Yurou also joked: "It seems that you all trust Ruoyu very much!" If you lose money, don't bother him! You must know that in this world, any investment is risky. ”

Lars waved his hand again and again: "Senior sister, I Lars promise not, even if it is a loss, it is my Lars's bad luck, and I will definitely not blame Li." ”

is the so-called eating people with a soft mouth and short hands, Lars is now living in Li Ruoyu's house, and eating the food cooked by Li Ruoyu, how can he say no. Of course, if it is really a loss, Lars's family will definitely investigate the reason, of course, whether it can be blamed on Li Ruoyu, it is difficult to say. However, investing is risky, and that's something that anyone knows.

The next morning, Li Ruoyu took Anna to drive to Linjiang Village, and now that Bai Yurou has become a pregnant woman, it is naturally not appropriate to run so far. Lars naturally went to accompany Old Man Bai to practice boxing, and then continued to live his leisurely life at night.

When she came to the office in Linjiang Village, Anna discussed the installation of the equipment of the mixing plant with the technicians of the project team.

Li Ruoyu went to the temporary laboratory at the construction site, and today Xie Zili and they will continue to do the trial. I don't know how they did yesterday, Li Ruoyu is very concerned about the problem of concrete mix.

When I came to the laboratory, I saw Xie Zili, Qin Haijuan and Li Liangfeng all preparing for today's trial.

Seeing Li Ruoyu coming, all three of them got up to say hello.

Li Ruoyu smiled and said: "Everyone has worked hard! How did the trial go yesterday? ”

Xie Zili said with a wry smile: "Yesterday, I tried to match, and I didn't make a few, because the performance of the raw materials was not very fully grasped, so the design of the mix ratio." It is not very suitable, one is that the admixture content is high, the other is that the sand rate of concrete is low, and the concrete working performance is not very good. Today we recalibrated a bit. Do it all over again. ”

Li Ruoyu nodded and said: "I have expected this problem, many of our technicians now do concrete mix design and light trial, we have to change this concept, combined with the condition elements of the mix design, from the concrete mix design, trial matching, adjustment three aspects. Pay attention to the whole process of ready-mixed concrete mix design, highlight the importance of trial matching, and further clarify that ready-mixed concrete mix design is a practical process under the guidance of experience and theory. ”

Qin Haijuan nodded and said, "Mr. Li said it too well!" Mix design is one of the most important tasks of our concrete company's laboratory, and it is also an important part of ensuring the quality of ready-mixed concrete. Some concrete companies do the determination of the mix ratio more arbitrarily, the table xiàn in the trial work of the attention to the process dù is not enough, do not test to determine the mix ratio, purely based on experience to determine the mix ratio, take it for granted to determine the mix ratio, can not be based on the changes in raw materials and user requirements to determine the concrete mix ratio. The main reason why we didn't succeed in the trial was empiricism. Of course, we didn't build a laboratory, so a lot of raw material tests were not done, and it was completely based on experience, which is really unacceptable. ”

Li Ruoyu laughed and said, "You can't be blamed for this!" I was there when I was designing. Of course, this is also a good learning process for Li Liangfeng, and there must be failure to succeed. It's not that experience is useless, it's just a combination of both. The design and calculation of the mix ratio is the first step of the whole ready-mixed concrete mix design, and the design and calculation of the mix ratio is on the basis of mastering the data. According to some theories, normative experience, etc., some parameters are selected to calculate the dosage of various ingredients. Therefore, from the concept of design calculation, we can see the importance of empirical number accumulation. The selection of any parameter is based on the accumulation of experience, and at the same time. After the calculated mix ratio is tested, the adjustment and even the final determination of the mix ratio must also be based on the number jù accumulated by experience. ”

Xie Zili nodded and said: "Well, in the "Ordinary Concrete Mix Design Regulations", the content of trial matching and adjustment is less expressed, and trial matching is the most important link in the design of concrete mixture. This requires that the raw materials used in the trial match must be representative, in order to ensure the guiding significance of the test results for actual production. The raw materials used in the trial must be representative, and the sampling of the raw materials used in the trial must be representative. Now our raw material samples are sampled on the stockpile, because there are too many factors that affect the representativeness of sampling, such as the size of the stockpile, the direction of the stockpile, natural environmental factors, and human factors. Of course, that's all there is to it for now. ”

Li Ruoyu said with a smile: "Li Liangfeng, did you hear it, this is the importance of experience." You need to see more, listen and ask more, for example, after the sample is taken, the sample should be prepared as needed. There are two things that must be paid attention to in sample preparation, one is that the sample can truly represent the raw material, and the other is that the sample must have a high degree of uniformity. The commonly used method of sample preparation is the quadrangle method. All raw materials must be inspected in strict accordance with national standards before the mix ratio can be calculated according to the inspection results and trial-matched. Of course, in actual work, it may not be too late to wait for all the raw material inspection results to come out, and then it is necessary to carry out trial matching, then, as the person who determines the trial matching plan, it is necessary to pay attention to collecting raw material statistics. For a new concrete company like ours, we can only rely on experience. However, in the future, we will start to build up our database of raw material information. ”

Li Liangfeng nodded and said: "I didn't expect the concrete company to have such a complicated thing, it seems that I really thought too simple before." ”

Xie Zili smiled: "Indeed, most people think so. When the plant is built, we will ask for it

Gradually establish a database of raw material inspection, establish an independent analysis account for the raw materials supplied by each supplier, and regularly evaluate the reliability and accuracy of the supplier's inspection report according to the statistical and analysis results, and the supplier's inspection report is reliable and accurate for a long time, and the report results can be directly applied when the concrete mix ratio is designed and calculated. Cement, to grasp the strength growth law of cement, and can use regression analysis method to infer the 28-day strength of cement based on the early strength of cement. (To be continued.) )