|Table of Contents|

Influence of particle size and dosing of fly ash microbeads on performance of grout(PDF)

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

Issue:
2024年4期
Page:
15-26
Research Field:
道路工程
Publishing date:

Info

Title:
Influence of particle size and dosing of fly ash microbeads on performance of grout
Author(s):
HE Rui1;  CHAI Hua1;  AN Ju-feng2;  LI Liang-liang1;  WANG Zhen-jun1;  YANG Shui-ping3
(1. School of Materials Science and Engineering, Chang'an University, Xi'an 710010, Shannxi, China; 2. CCCC-SHB Fourth Engineering Co, Ltd., Luoyang 471000, Henan, China; 3. Gansu Province Linxia Highway Development Center Shuangcheng Highway Section, Linxia 731800, Gansu, China)
Keywords:
road engineering;  fly ash microbead;  particle size;  flowability;  compressive strength;  pore structure;  hydration heat
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2024.04.002
Abstract:
In order to investigate the influence of the particle size and dosage of fly ash microbeads on the performance of grout, four types of fly ash microbeads with different particle sizes were selected to prepare grout and test its fluidity and compressive strength. The pore structure analyzer, isothermal microcalorimeter and scanning electron microscope(SEM)were used to analyze the changes of pore structure parameters, hydration exothermic properties and microscopic morphology of the grout, and to explore the influence mechanism of fly ash microbeads on the performance of the grout. The results show that small particle size(≤45 μm)of the fly ash microbeads help to increase the fluidity of the grout and enhance the 28 d strength of the grout, and when 10 μm beads dosage(mass fraction, the same below)is 10%, the 28 d compressive strength is the largest. Fly ash microbeads doping increase the total air content of the grout, when 10 μm beads dosage is 5%, it can be refined and improve the pore structure of the material. With the increase of the dosage of fly ash microbeads, the decrease of the exothermic heat of hydration is more significant, and the exothermic heat of hydration decreases with the increase of the particle size of fly ash microbeads. SEM microanalysis shows that the surface of fly ash microbeads with small particle size generates more hydration products. Overall, the incorporation of 5% to 10% small particle size fly ash microbeads can significantly improve the working performance and 28 d compressive strength of the grout, and reduce the exothermic heat of hydration of the grout.4 tabs, 19 figs, 26 refs.

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Last Update: 2024-07-10