搅拌工艺对自密实水泥砂浆强度和扩展度的影响

doi:10.13229/j.cnki.jdxbgxb.20230918

摘要/Abstract

摘要：

试验采用无级变速的搅拌机，研究了搅拌速度、搅拌时间以及掺入消泡剂后的低速搅拌过程对水泥砂浆强度和扩展度的影响。试验结果表明：采用无级变速搅拌机搅拌的水泥砂浆扩展度明显大于常规水泥砂浆搅拌机所搅拌的水泥砂浆扩展度；在相同配合比下，高转速和长时间搅拌工艺所得的水泥砂浆相对于低速和短时间的搅拌工艺所得的砂浆而言，扩展度提高了10%，强度提高了约7%；在前期搅拌工艺相同的条件下，掺入消泡剂后再经过变挡低速搅拌，所得水泥砂浆7 d的强度大于没有经历该过程的水泥砂浆28 d的强度。

关键词: 自密实水泥砂浆, 搅拌速度, 搅拌时间, 消泡剂, 强度, 扩展度

Abstract:

The effect of mixing speed， time， and low speed mixing process after placing defoamer on strength and slump of self-compacting cement mortar were investigated. Test results show that slump of cement mortar mixed by continuously variable transmission （CVT） mixer is larger than that mixed by conventional cement mortar mixer under the same mix proportions. Compared with mixing process with low speed and short time， slump and strength of cement mortar corresponding to mixing process with high speed and longer time increase 10% and 7%， respectively. Process of low speeding mixing after placing defoamer has an appreciable increase in compressive strength， which make the 7 d strength of cement mortar is larger than 28 d strength of cement mortar without this process， when their previous mixing process are the same.

Key words: self compacting cement mortar, mixing speed, mixing time, defoamer, strength, slump

李静,李征徽,郭重霄,胡建生. 搅拌工艺对自密实水泥砂浆强度和扩展度的影响[J]. 吉林大学学报(工学版), 2024, 54(12): 3552-3557.

Jing LI,Zheng-hui LI,Chong-xiao GUO,Jian-sheng HU. Effect of mixing process on strength and slump of self compacting cement mortar[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(12): 3552-3557.

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