帮忙翻译,汉译英,超高悬赏100!

发布网友发布时间：2022-05-12 10:21

共3个回答

热心网友时间：2023-10-03 07:39

With the rapid development of China's construction instry, people increasingly focus on the quality of concrete, development of new high-quality energy and materials of high strength concrete is an effective way. In construction work, especially in the high-level structure with pumping concrete projects, not only facilitate the rational use of high strength concrete to meet structural design requirements, simplify the construction process, and can avoid low-strength concrete brought a series of advantages and disadvantages of disease.
The combination of the engineering high-strength concrete (strength grade of general in the C50 ~ C60) status of the application and materials needed to develop a high liquidity, low slump loss (especially in the summer high temperature), sound and efficient pumping enhancement agent.
A test of raw materials and concrete mix
(1) Cement: Cement proction in China's S & P 525 silicon cement.
(2) gravel: gravel (0.5 ~ 3cm) 2 distribution, which accounted for 0.5 ~ 2cm 25%, 1 ~ 3cm 75%.
(3) sand: natural sand (coarse sand), fineness molus of 2.7.
(4) Admixture: NA-F2 (B) efficient pumping agent, content 1.8% ~ 2.5% (liquid) to cement weight.
(5) Water: clean water.
(6) Table 1 shows the concrete mix.

2 Laboratory test results
2.1 the flow properties of fresh concrete and the slump loss
China's high-strength concrete pumping technology commonly used by the construction. For concrete, which have good workability, slump larger and smaller losses. According to the aforementioned C50 mix for slump loss, pressure bleeding rate. Results under different conditions shown in Table 2.

Can be seen from Table 2, mixed NA-F2 (B) efficient pumping agent of high strength concrete, slump retention, high, 1h loss rate of ≤ 5%, 1.5h loss rate of ≤ 10%. Concrete pressure bleeding rate is only about 33%, indicating mixed NA-F2 (B) can pump concrete pumping agent's performance is better, not only at room temperature to meet the pumping requirements, and at higher temperatures, low temperatures will not affecting the normal casting.
2.2 The setting time of concrete
In accordance with the "hydraulic testing proceres for SD105-82" in the setting time of concrete test method, according to the aforementioned C50, C60 with different temperature conditions compared to the concrete setting time. Doped NA-F2 (B) high pumping agent of C50, C60 concrete setting time is about 8 ~ 12h, which NA-F2 (B) inhibition of early hydration heat, rece the temperature of concrete at early stress, improve mass crack resistance and rability of concrete is beneficial.
2.3 Water Recing Concrete
In accordance with the "hydraulic testing proceres for SD105-82" concrete water-recing test method, according to the aforementioned C50, C60 compared with concrete with different water-recing admixture rate experiments. The results shown in Table 3.

Can be seen from Table 3, mixed NA-F2 (B) high strength concrete by water pumping agent is greater than 20%. This will improve the mechanical strength of concrete is very beneficial, if maintained, and benchmark the same strength of concrete, cement per m3 of concrete can save about 20%, can rece the project cost.
2.4 and the compressive strength of concrete shrinkage
In accordance with the "hydraulic testing proceres for SD105-82" concrete shrinkage (swelling) test methods to test. By the aforementioned C50, C60 concrete mix, additives for the NA-F2 (B) efficient pumping agent, the weight of cement content to 2.5% (liquid).
Shrinkage of concrete by the following formula:
§ t = (Lt-L0) / (L0-2 △)
At the same time for different age compressive strength test, the results shown in Table 4.

热心网友时间：2023-10-03 07:39

去学校找老师问就知道了啊

热心网友时间：2023-10-03 07:40

查英汉字典