|Table of Contents|

Low-viscosity regulation and performance of C60 concrete(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年3期
Page:
56-66
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Low-viscosity regulation and performance of C60 concrete
Author(s):
ZHANG Feng1; 2;  BAI Yin1; 2;  LYU Le-le1; 2;  CHEN Bo1; 2;  NING Feng-wei1; 2;  HU Hai-ming1; 2
(1. Nanjing Hydraulic Research Institute, Nanjing 210029, Jiangsu, China; 2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210024, Jiangsu, China)
Keywords:
bridge engineering;  pumped concrete;  viscosity;  yield shear stress;  pumping pressure loss;  CFD simulation
PACS:
U444
DOI:
10.19721/j.cnki.1671-8879.2023.03.006
Abstract:
In order to solve the high head pumping problem of high-strength and low-flow concrete, the influence of low-viscosity regulation measures such as 5 to 10 mm particle size gravel, grade Ⅰ fly ash, air-entraining agent, thixotropic agent and viscosity reducer on the working performance and rheological properties of C60 concrete were studied, and the effect of different regulation measures on the pumping pressure loss of concrete was also studied based on CFD numerical simulation. On this basis, the mix proportion of low-flow high-performance C60 prestressed concrete was optimized. The results show that all the five low-viscosity measures can increase the slump and spread of the mixture, and decrease the viscosity and yield shear stress. The addition(mass fraction, the same below)of 15% grade Ⅰ fly ash or 0.001% viscosityreducer can reduce the viscosity of the mixture by 21% to 25%, and adding 0.005% air-entraining agent(4.8% gas content)can reduce the yield shear stress by 70%. The low-flow concrete flows in the form of plunger flow in the pump tube. The increase of the viscosity of the mixture and the yield shear stress will cause the increase of pumping pressure loss, and the viscosity has a more obvious effect on the pump pressure loss. The increase of viscosity and yield shear stress will lead to the increase of pumping pressure loss, and the effect of viscosity on pumping pressure loss was more obvious. The five kinds of low-viscosity measures can all reduce the pressure loss of concrete flowing in the pipeline, and the addition of 0.001% viscosity reducer can reduce the pressure loss by 50% to 53%. The optimized C60 prestressed concrete mixture has a viscosity of 120 to 135 Pa?s,a yield shear stress of 235 to 252 Pa, 7 d compressive strength can reach 72.1 to 75.3 MPa, and dry shrinkage of -0.04% at 120 d.11 tabs, 10 figs, 30 refs.

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Last Update: 2023-06-30