基于Toufar模型的级砂组合对UHPC强度的影响

硅酸盐通报 ›› 2020, Vol. 39 ›› Issue (12): 3832-3836.

基于Toufar模型的级砂组合对UHPC强度的影响

林晓松¹, 黄志斌^2,3

1.福建工程学院土木工程学院,福州 350118;
2.东南沿海铁路福建有限责任公司,福州 350013;
3.中南大学土木工程学院,长沙 410075

发布日期:2021-02-01
通讯作者: 黄志斌,博士研究生,高工。E-mail:983123077@qq.com
作者简介:林晓松(1984—),女,实验师。主要从事高性能土木工程材料、模型修正与模型确认、结构健康监测、既有结构评估与加固改造等研究。E-mail:1462906332@qq.com
基金资助:
福建工程学院本科实验教学改革项目(WT2017004)

Effect of Sand Combination on Strength of UHPC Based on Toufar Model

LIN Xiaosong¹, HUANG Zhibin^2,3

1. School of Civil Engineering, FuJian University of Technology, Fuzhou 350118, China;
2. Southeast Coastal Railway Fujian Co., Ltd., Fuzhou 350013, China;
3. School of Civil Engineering, Central South University, Changsha 410075, China

Published:2021-02-01

摘要/Abstract

摘要： 为了研究砂的级配对超高性能混凝土(UHPC)强度的影响,通过筛分试验将砂分为5级,1～5级砂的粒径区间分别为1.25～2.5 mm、0.63～1.25 mm、0.315～0.63 mm、0.16～0.315 mm和0.08～0.16 mm。根据3&4和3&4&5级砂组合的试验数据,分别对Toufar模型进行了修正和验证。采用修正后的Toufar模型,计算4&5、2&3&4&5、1&2&3&4&5级砂组合最大特征密实度。采用4种级砂组合设计UHPC配合比(4&5、3&4&5、2&3&4&5、1&2&3&4&5),测试其强度。研究表明,修正的Toufar 模型能用于UHPC配合比设计中级砂组合最大特征密实度及各级砂质量比的计算。当3、4、5级砂的质量比M_3S:M_4S:M_5S=1:0.35:0.473时,该级砂组合的密实度最大,对应的UHPC抗折和抗压强度最大。

关键词: 超高性能混凝土(UHPC), 砂, Toufar模型, 特征密实度, 强度, 级砂组合

Abstract: In order to investigate the influence of sand gradation on the strength of ultra-high performance concrete (UHPC), sand was divided into 5 grades by screening test, and the particle size ranges of grade 1 to grade 5 of sands are 1.25 mm to 2.5 mm, 0.63 mm to 0.63 mm, 0.315 mm to 0.63 mm, 0.16 mm to 0.315 mm and 0.08 mm to 0.16 mm, respectively.Based on the test data of sand combination of 3&4 and 3&4&5, the Toufar model was modified and verified, respectively.Then, the modified Toufar model was used to determine the maximum characteristic compactness of 4&5, 2&3&4&5 and 1&2&3&4&5. The four kinds of sand combinations (4&5, 3&4&5, 2&3&4&5, 1&2&3&4&5) were used in the mix proportion design of UHPC, and their strengths were measured. The research results show that the modified Toufar model can be used to calculate the maximum characteristic compactness of sand combination and the mass ratio of different grade of sands in UHPC mix proportion design. When the mass ratio of 3, 4 and 5 grade of sands is 1:0.35:0.473, the compactness of the sand combination is the maximum, and the correponding flexural strength and compressive strength of UHPC are the largest.

Key words: ultra-high performance concrete (UHPC), sand, Toufar model, characteristic compactness, strength, sand combination

中图分类号:

TU528.041

林晓松, 黄志斌. 基于Toufar模型的级砂组合对UHPC强度的影响[J]. 硅酸盐通报, 2020, 39(12): 3832-3836.

LIN Xiaosong, HUANG Zhibin. Effect of Sand Combination on Strength of UHPC Based on Toufar Model[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3832-3836.

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