材料科学与工程学报2024，Vol.42Issue(2)：205-212,8.DOI:10.14136/j.cnki.issn1673-2812.2024.02.006
凝灰岩机制砂特性对砂浆流动度和强度的影响机理
Mechanism of Tuff Manufactured Sand Characteristics on Mortar Fluidity and Strength
林高航 1陈振光 2缪闯波 2张春英 3宋广明 4张利锋1
作者信息
- 1. 浙江大学 建筑工程学院, 浙江 杭州 310058
- 2. 中国铁路上海局集团有限公司杭温工程建设指挥部, 浙江 杭州 311215
- 3. 百盛联合杭温铁路有限公司, 浙江 杭州 311215
- 4. 中铁十一局集团有限公司, 浙江 温州 325115
- 折叠
摘要
Abstract
The physical properties including crushing index,bulk density,void fraction,saturated surface dry water absorption and specific surface area of tuff manufactured sand from 10 different manufacturers were determined.The correlations between various characteristics and mortar fluidity,compressive strength and flexural strength were studied,and the internal mechanism was analyzed.The results show that the sharp corners of manufactured sand increase the crushing index and the void fraction.Lithology of the parent rock and fine will affect the saturated surface dry water absorption and specific surface area of the manufactured sand.The difference in saturated surface dry water absorption will not only affect the fluidity of the fresh mortar,but also have influence on the time-varying loss of the fluidity.The greater the saturated surface dry water absorption of sand,the smaller the fluidity of fresh mortar,and the greater the time-varying loss of the fluidity.When the water-cement ratio is 0.5,the flexural strength and compressive strength of manufactured sand mortar are higher than those of standard mortar.The difference in strength is mainly due to two reasons.One is the strong mechanical bite force brought by the rough surface of manufactured sand and the other is the improvement of interfacial transition zone caused by high saturated surface dry water absorption of sands.With the same fluidity,the influence law of mortar's strength changes with the fluidity value.When the fluidity is 180 mm,the strength of the manufactured mortar is still higher than that of the standard mortar.But,when the fluidity increases to 240 mm,the water-cement ratio increases significantly,the strength of manufactured mortar is far lower than that of standard mortar.关键词
凝灰岩机制砂/流动度/强度比Key words
Tuff manufactured sand/Fluidity/Strength ratio分类
化学化工引用本文复制引用
林高航,陈振光,缪闯波,张春英,宋广明,张利锋..凝灰岩机制砂特性对砂浆流动度和强度的影响机理[J].材料科学与工程学报,2024,42(2):205-212,8.
