Comparing the pozzolanic behavior of sugar cane bagasse ash to amorphous and crystalline SiO2

被引：63
|
作者：
de Soares, Marcela M. N. S. [1 ,2 ]
Garcia, Dayana C. S. [2 ]
Figueiredo, Roberto B. [3 ]
Aguilar, Maria Teresa P. [3 ]
Cetlin, Paulo R. [4 ]
机构：
[1] Ctr Fed Tecnol Minas Gerais, Dept Min Engn & Civil Construct, BR-38180510 Araxa, MG, Brazil
[2] Univ Fed Minas Gerais, Dept Met Engn, BR-31270901 Belo Horizonte, MG, Brazil
[3] Univ Fed Minas Gerais, Dept Mat Engn & Civil Construct, BR-31270901 Belo Horizonte, MG, Brazil
[4] Univ Fed Minas Gerais, Dept Mech Engn, BR-31270901 Belo Horizonte, MG, Brazil
来源：
CEMENT & CONCRETE COMPOSITES | 2016年 / 71卷
关键词：
Calcium-silicate-hydrate (CeSeH); Hydration products; Pozzolan; Silica fume; IMAGE-ANALYSIS; CEMENT; LIME; CONDUCTIVITY;
D O I：
10.1016/j.cemconcomp.2016.04.005
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The present paper aims to clarify the pozzolanic behavior of sugar cane bagasse ash-SCBA by comparing it to amorphous and crystalline silica. It is shown that calcium silicate hydrate is formed in lime solution with SCBA but the reaction is slow and does not consume all the material. Comparing its results with the obtained in tests with silica fume and with crushed quartz show a better agreement with the lam Characterization of cement pastes shows 20% of cement replacement by sugar cane bagasse ash leads only a minor reduction in the amount of calcium hydroxide formed. This behavior is also closer to the observed in quartz than in silica fume. The results suggest SCBA should be used as a replacement for inert constituents in cement composites rather than pozzolanic addition. Analysis of the Microstructure of the cement pastes revealed the presence of calcium hydroxide in samples prepared with partial replacement by silica fume, quartz and sugar cane bagasse ash. The presence of this phase in the sample prepare with silica fume was attributed to agglomeration of the particles that affected the reactivity of this material. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：20 / 25
页数：6
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