At this time, Zhou Qingshuang also came up and said: "Li Fusheng, you really wrote a paper, show me, I also want to write one!"
” Li Fusheng said helplessly: "It's not well written, don't laugh at me when you read it!"
” Zhou Qingshuang took the two pages from Lin Qi's hand, and said while reading: "Yes, yes, it seems that I also have to complete the whole article, I heard that in the future, there will be requirements for the evaluation of the title of engineer, how many papers have been published." ” Lin Qi said sourly: "Sister Shuang, you can write it, the paper is not just anyone can write it!"
” Seeing this, Li Fusheng hurriedly said: "Ah, okay, okay, don't talk about it, I want to think about it, Chief Engineer Duan said that this paper needs to be revised, you can do your own work, don't bother me!"
” Zhou Qingshuang and Lin Qi both straightened their chests in unison, each snorted, and returned to their positions.
Li Fusheng consulted the relevant information again, and thought about it a lot, and finally found that it seems that the mud content of sand has an effect on the gas content of concrete mixture, and few people have written about it.
So he went to the testing room again and did a comparative test, and then he found a phenomenon, that is, when the mud content is relatively small, the gas content decreases with the increase of the gas content; However, when the mud content is relatively high, that is, it exceeds the three percent specified in the standard, and after reaching four percent, the increase in the mud content also brings an increase in the air content of the concrete.
In the end, he figured out the reason, that is, because the sand is relatively clean, there will be a lack of particles below 0.08 mm, the concrete is prone to water leakage, and the cohesion becomes poor, so according to the filling theory of concrete, due to the fine pores in the concrete, there is less filling of particles below 0.08 mm in the sand, and the voids will become more, so this leads to a higher gas content of concrete.
However, when the mud content is too large, the concrete becomes too sticky, the friction resistance between the aggregates increases, the gap between the coarse and fine aggregates also increases, and the air content also increases.
This is a relatively new discovery, and Li Fusheng feels that this conclusion is relatively novel and unique when written in the paper.
It seems that the sand is too clean, and it is not necessarily the best, because when there is a small amount of mud, the concrete working performance is a little better than the clean, of course, if it is too high, the impact on the concrete working performance is too great, Li Fusheng remembered the situation he encountered in Jiatai Concrete Company, but it is not the mud content of the sand, which is ridiculously high, which has led to so many quality problems.
At the time, he just thought it had to do with the quality of the sand, but he didn't quite understand what it was, but now he finally figured it out.
Li Fusheng found that sometimes the harvest of writing papers and doing experiments may be better than simply endorsing and memorizing standards, I don't know how many times better!
This is really the poem of the Song Dynasty poet Lu You: The paper is shallow, and you never know that you have to do it.
In fact, this poem will not be wrong in modern society.
Just like Chief Engineer Duan Yongfu, the reason why he was able to become a well-known expert in the industry is definitely because of the accumulation of a lot of experience, coupled with his own diligence and continuous summary, to reach the current point.
Those standards and specifications are all summarized through a large number of experiments and data analysis.
Li Fusheng picked up the pen again and revised the paper again.
Duan Yongfu also thought it was good, so he directly sent Li Fusheng's paper to the editorial board of the magazine "Ready Mixed Concrete" by EMAIL, and his old friend, industry expert Ding Lao.
After sending it, Duan Yongfu also called in person and told him about it.
Ding Lao was also very happy, and after chatting freely with old friends, Ding Lao said that he would definitely review it carefully, and if there was no problem, he would be able to send it out in the next issue.
Just when Li Fusheng was like a treasure, a bad news came.
The last order for the shipyard went wrong.
The first batch of PHC pipe piles were broken during the first pile test.
Whether it was the construction unit Roche Engineering Company or the owner Yuehai Shipping Engineering Company, they called and sent letters to Linhai Concrete Company of China Shipping Third Harbor Bureau, accusing the batch of PHC concrete pipe piles of quality problems.
Knowing that there was a problem with the test pile, Luo Fei also rushed to the scene in a hurry.
After trying a few piles, all of them were damaged, and Luo Fei was also very angry, didn't he say that the quality of PHC pipe piles of Linhai Concrete Company of China Shipping Third Harbor Bureau was the best in the whole of China Shipping?
How so?
Seeing that Mr.
Luo was so angry, the chief engineer Shi Qiang also did not dare to come out, if this affected the construction period, the loss would be great, and he was not sure whether it was the construction or the quality of the pipe pile.
Generally speaking, though, when something goes wrong, the best thing to do is to push everything onto the PHC pipe pile supplier.
Luo Fei turned around and asked angrily: "Mr.
Shi, you are the chief engineer, tell me, what is going on?"
This batch of PHC pipe piles entered the site, didn't you seriously organize the quality acceptance?
Now what do you say?
” Shi Qiang hurriedly said: "Mr.
Luo, this, we can only check the appearance quality of the pile body when we accept it, but we can't check its strength, I suspect that the strength of this batch of PHC pipe piles cannot reach the design strength."
Originally, the main purpose of the pile is to determine the hammering force, pile length control and other parameters, and to carry out pile quality inspection to understand the integrity of the pile, but now there is no hammer down, and there is no problem with our construction process, so it can only be the quality problem of PHC pipe pile!
” Luo Fei said in a deep voice: "Are you sure?
What if not?
You have to know that the chief section of Linhai Concrete Company is Yongfu, but an expert in the pipe pile industry, don't be a quality problem with pipe piles, we will be very faceless!
” Shi Qiang hurriedly said: "But now there is no other way, only let the people of the pipe pile factory study together, what is the reason, if they don't say that their pipe piles have quality problems, they are afraid that they will not come."
And I don't think we have any problems with construction. ” Luo Fei said: "Okay, Mr.
Dong, you immediately send a letter to the Linhai Concrete Company of China Shipping Third Harbor Bureau, and at the same time call their person in charge and ask them to send someone over immediately!"
” Dong Lei hurriedly responded, but he was still a little worried, because he felt that it might not be the quality of the pipe pile, because in order to save construction costs, they used the hammering method, which is also the consistent practice of many companies in the foundation engineering industry.
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Because if the static pressure method is used, the cost of the equipment is too high, and it is difficult to get to this island, they are not unaware of the benefits of the static pressure method, the construction noise is small, and the damage to the pile is small.
But there was no way, and after considering all aspects, I chose the hammer method.
Although the hammering method is noisy and the damage rate to the pile is much higher than that of the static pressure method, it also has the advantage, that is, the construction cost is very cheap, and the pile driver is more convenient to transport to the island.