欢迎访问《建筑材料学报》编辑部网站！

引用本文:	王雨利,蔡基伟,杨雷,砂灰比为2.石灰石粉对砂浆耐磨性能的影响及作用机理[J].建筑材料学报,2014,17(2):270-273

【打印本页】【下载PDF全文】【查看/发表评论】【EndNote】【RefMan】【BibTex】

←前一篇|后一篇→

过刊浏览高级检索

本文已被：浏览 912次下载 0次	码上扫一扫！
分享到：微信更多字体:加大+\|默认\|缩小-
石灰石粉对砂浆耐磨性能的影响及作用机理
王雨利¹, 蔡基伟², 杨雷¹, 砂灰比为2³
1.河南理工大学材料科学与工程学院，河南焦作454000;2.河南大学材料与结构研究所，河南开封475004;3.1水泥石的显微硬度测试压痕图Fig1Microhardnesstestofhydratedcement图2水泥石的显微硬度Fig2Microhardnessofhydratedcement由图2可以看出，水泥石与骨料的界面过渡区厚度基本在10~20μm，水泥石硬度从小到大的顺序分别是石灰石粉掺量为35%，70%，140%和105%，也就是说，随着石灰石粉掺量的增加，水泥石的硬度先增大，后减小，当石灰石粉掺量为105%时，水泥石的硬度最大，从而说明石灰石粉提高了水泥石的硬度

摘要:

运用宾汉姆模型试验研究了不同超塑化剂掺量下石灰石粉等量取代水泥对水泥净浆流变性能的影响.结果表明：石灰石粉较大比表面积和较小表观密度带来的对水较强吸附作用和使水粉比（体积比）有所降低劣化了水泥净浆的流变性能，而其良好的颗粒级配和形貌，以及促进水泥颗粒吸附超塑化剂的作用则对水泥净浆的流变性能有改善效果.这2方面因素相互制约，使得超塑化剂掺量出现明显的临界点.

关键词: 流变性能石灰石粉超塑化剂临界点吸附

DOI：103969/j.issn1007 9629201402017

分类号:

基金项目:国家自然科学基金资助项目(50908076)；河南省教育厅项目(2010A560009)；河南省高等学校矿业工程材料重点学科开放实验室开放基金资助项目(MEM12 20)

Rheological Properties of Cement Paste with Limestone Powderat Different Dosages of Superplasticizers

XU Wen,GUO Fei,TIAN Qian

1.State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Institute of Building ScienceCo. Ltd., Nanjing 210008, China;2.Jiangsu Bote New Materials Co. Ltd., Nanjing 210008, China

Abstract:

An experimental investigation was carried out to evaluate the effect of limestone powder with equivalent replacement of cement on the rheological properties of cement paste at different dosage of superplasticizers based on Bingham model. The results indicate that the larger specific surface area and smaller apparent density of limestone powder than cement led to stronger adsorption effect on water and lower water powder ratio(by volume), which deteriorate the rheological properties of cement paste, while its good grain composition, favourable particle morphology and promotion effect on the adsorption of cement particles to superplasticizers ameliorate it. These factors of two aspects result in an obvious critical point of the dosage of superplasticizers.

Key words: rheological property limestone powder superplasticizer critical point adsorption