激发剂组成对碱激发-矿渣水泥砂浆变形及力学性能的影响

N E W B U I L D I N G M AT E R I AL S

基金项目:国家自然科学基金面上项目(51374189)收稿日期:2016-12-15;修订日期:2017-02-09

作者简介:王宇轩,男,1993年生,安徽宿州人,硕士研究生,主要从事混凝土外加剂研究。E-mail :7577333581@https://www.360docs.net/doc/1717168486.html, 。通讯作者:陈佩圆,地址:安徽省淮南市泰丰大街168号,E-mail :peiyuan29@https://www.360docs.net/doc/1717168486.html, 。

摘要:系统研究了不同模数和含固量的Na 2SiO 3/NaOH 复合激发剂溶液对水胶比为0.55的碱激发-矿渣水泥砂浆凝结时

间、化学收缩、自收缩和抗压强度的影响,并使用XRF ,XRD ,MBET 等分析方法表征分析了矿渣样品。结果表明,

矿渣主要由无定形态SiO 2组成,具有较高的反应活性。与同水胶比水泥砂浆相比,尽管具有相近的7d 化学收缩,然而碱激发-矿渣水泥砂浆的自收缩和抗压强度均远大于水泥砂浆。

不同激发剂组成对碱激发-矿渣水泥砂浆的变形及力学性能均有显著地影响,其自收缩随激发剂模数的增大而降低,随含固量的增大先增大后减小。

关键词:碱激发-矿渣水泥;化学收缩;

自收缩;抗压强度中图分类号:TU57+8.1文献标识码:A 文章编号:1001-702X (2017)08-0001-04

Influence of activator with different compositions on the deformation and mechanical properties of

alkali-activated slag cement mortar

WANG Yuxuan 1,ZHOU Guoan 2,CHEN Peiyuan 2,WANG Dongping 1

[1.Institute of Civil Engineering and Construction ,Anhui University of Science and Technology ,Huainan 232001,China ;

2.CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD ),

Department of Modern Mechanics ,University of Science and Technology of China ,Hefei 230026,China]

Abstract :The influence of Na 2SiO 3/NaOH composite activators with different modulus and solid content ,

on the setting time ,chemical shrinkage ,autogenous shrinkage and compressive strength of alkali-activated slag cement mortar (binder to cement or slag is 0.55)was systematically investigated ,and the slag sample was characterized by XRF ,XRD and MBET.Results show that slag is mainly composed by amorphous glass phase ,having a very high https://www.360docs.net/doc/1717168486.html,pared with cement mortar with the same binder to

cement or slag ratio ,alkali-activated slag cement mortar has much larger compressive strength and autogenous shrinkage ,but similar

7days chemical shrinkage.Activators with different modulus and solid content influence significantly the deformation and mechanical properties of alkali-activated slag cement mortar ,specially ,the bigger the modulus ,the smaller the autogenous shrinkage ,while the increasing of the solid content made autogenous shrinkage increase firstly but reduce at later stage.

Key words :alkali-activated slag cement ,chemical shrinkage ,autogenous shrinkage ,compressive strength

使用矿渣作为胶凝材料不仅可制备强度高、耐久性好的

碱激发-矿渣混凝土,而且还可有效地降低水泥的用量,减少因生产水泥所导致的高能耗、高污染问题,具有优异的经济和

环保效益[1]。然而,碱激发-矿渣水泥(矿渣水泥)早期收缩较

大,容易发生开裂[2],而裂缝的形成会加速有害物质进入构件内部,降低矿渣混凝土的力学强度和耐久性,因而限制了矿渣水泥的工程应用。

近年来,众多学者对矿渣水泥研究做了大量的工作[3-5],但这些研究工作更多的是聚焦在矿渣水泥的水化机理和强度形成等方面,而对于矿渣水泥的变形特性,特别是自收缩的研究较少[1]。研究表明,矿渣水泥砂浆凝结硬化后,所发生的收缩主要是自收缩[2]。自收缩是由矿渣水泥水化反应的自干燥

激发剂组成对碱激发-矿渣水泥砂浆

变形及力学性能的影响

王宇轩1,周国安2,陈佩圆2,王东平1

(1.安徽理工大学土木建筑学院,安徽淮南

232001;

2.中国科学技术大学近代力学系,中国科学院材料力学行为和设计重点实验室,安徽合肥

230026

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