Determination of Lubrication Layer Thickness and Its Effect on Concrete Pumping Pressure.

IF 3.1 3区材料科学 Q3 CHEMISTRY, PHYSICAL Materials Pub Date : 2024-10-21 DOI:10.3390/ma17205136

Rong Deng, Tong Ye, Zhiwei Ye

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Abstract

The flow of six kinds of fresh concrete under different flow rates and lubrication layer thickness (T_LL) values in the horizontal pipe was numerically simulated. The influence of the T_LL on the pressure per unit length (P_L) was analyzed. It was determined that the formation of the lubrication layer (LL) significantly reduces the P_L in concrete pumping. As the T_LL increased, the P_L decreased. However, the degree of reduction in the P_L gradually decreased as the T_LL increased. Relating the simulated P_L with the experimental P_L, the size of the T_LL was obtained, which was between 1 and 3 mm. The minimum and maximum were 1.23 and 2.58 mm, respectively, and the average value was 1.97 mm. The strength (S24, S50), the size of the aggregate (A10, A20, A25), and the flow rate of pumping all affected the T_LL. The type of fresh concrete and the flow rate of pumping significantly affected the P_L, which impacted the T_LL. However, the T_LL also impacted the P_L. Finally, this made the T_LL change within a certain range. When P_L > 14,000 Pa/m, 2 mm < T_LL< 3 mm; on the other hand, 1 mm < T_LL< 2 mm. Therefore, we can use CFD to simulate the flow of all types of concrete in the actual pumping pipeline with a T_LL of 2 mm to obtain their pumping pressure and guide the actual construction.

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确定润滑层厚度及其对混凝土泵送压力的影响

对六种新拌混凝土在不同流速和润滑层厚度（TLL）值下在水平管道中的流动情况进行了数值模拟。分析了 TLL 对单位长度压力（PL）的影响。结果表明，润滑层（LL）的形成大大降低了混凝土泵送过程中的单位长度压力。随着 TLL 的增加，单位长度压力降低。然而，随着 TLL 的增加，PL 的降低程度逐渐减小。将模拟 PL 与实验 PL 相比较，可以得出 TLL 的大小在 1 至 3 毫米之间。最小值和最大值分别为 1.23 毫米和 2.58 毫米，平均值为 1.97 毫米。强度（S24、S50）、骨料大小（A10、A20、A25）和泵送流速都会影响 TLL。新拌混凝土的类型和泵送流速对 PL 有很大影响，而 PL 又对 TLL 有影响。然而，TLL 也影响 PL。最后，这使得 TLL 在一定范围内发生变化。当 PL > 14,000 Pa/m 时，2 mm < TLL< 3 mm；反之，1 mm < TLL< 2 mm。因此，我们可以利用 CFD 来模拟实际泵送管道中 TLL 为 2 mm 的各类混凝土的流动情况，从而获得其泵送压力，指导实际施工。

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.