摘要
研究了掺矿渣粉和高效减水剂的羟乙基甲基纤维素改性水泥砂浆的力学性能 (包括抗压强度、抗折强度、弹性模量、粘结抗拉强度 )及其与新拌砂浆体积密度和硬化砂浆孔隙率的关系 .掺加减水剂、矿渣粉和羟乙基甲基纤维素后 ,砂浆的抗压强度与新拌砂浆体积密度和硬化砂浆孔隙率密切相关 ,抗折强度与之部分相关 ,粘结抗拉强度则与之无关 .减水剂和矿渣粉可增加砂浆的密实度 ,减小孔隙率 ,从而使砂浆的抗压强度、抗折强度、粘结抗拉强度和弹性模量得到提高 ;羟乙基甲基纤维素虽可保持砂浆的粘结抗拉强度稳定 ,但却使抗压强度和弹性模量降低 .减水剂、矿渣粉和羟乙基甲基纤维素的共同作用 ,既增加了砂浆的粘结抗拉强度 ,又使砂浆有足够的抗压强度、抗折强度和弹性模量 .当羟乙基甲基纤维素掺量被控制在一定范围内时 。
Mechanical properties of cement mortars modified by hydroxyethyl methyl cellulose, ground granulated blast furnace slag and superplasticiser, including compressive strength, flexural strength, elastic modulus and tensile bond strength, were investigated. Furthermore, relationships between those properties and bulk density of fresh mortars as well as porosity of hardened mortars were also studied. The research results showed that compressive strength of cement mortars has a good relationship with bulk density of fresh mortars and porosity of hardened mortars, flexural strength has a part relation with them, but tensile bond strength has no relation with them. Superplasticiser and ground slag can enhance the compactness of mortar and reduce its porosity, which improves its compressive strength, flexural strength, elastic modulus and tensile bond strength. Hydroxyethyl methyl cellulose is able to maintain tensile bond strength but decrease compressive strength and elastic modulus. The combination of superplasticiser, ground slag and hydroxyethyl methyl cellulose may not only increase the tensile bond strength of mortar, but also made it have enough compressive strength, flexural strength and elastic modulus. Therefore, with the proper addition of hydroxyethyl methyl cellulose, the modified cement mortar can be used as bridge pavement and corresponding repair materials.
出处
《建筑材料学报》
EI
CAS
CSCD
2001年第3期232-237,共6页
Journal of Building Materials
基金
国家留学基金资助项目
关键词
水泥砂浆
羟乙基甲基纤维素
矿渣粉
高效减水剂
力学性能
cement mortar
hydroxyethyl methyl cellulose
ground granulated blast furnace slag
superplasticiser
mechanical property
