掺固硫灰活性粉末混凝土的制备和性能<sup>*</sup>

doi:10.11901/1005.3093.2013.493

材料研究学报

2014, Vol. 28

Issue (1): 59-66 DOI: 10.11901/1005.3093.2013.493

本期目录 | 过刊浏览

掺固硫灰活性粉末混凝土的制备和性能^*

高燕,吕淑珍(

),卢忠远,李军,张丹

西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地绵阳 621010

Preparation and Properties of Reactive Powder Concrete with Circulating Fluidized Bed Combustion Fly Ash

Yan GAO,Shuzhen LV(

),Zhongyuan LU,Jun LI,Dan ZHANG

State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010

引用本文:

高燕,吕淑珍,卢忠远,李军,张丹. 掺固硫灰活性粉末混凝土的制备和性能^*[J]. 材料研究学报, 2014, 28(1): 59-66.
Yan GAO, Shuzhen LV, Zhongyuan LU, Jun LI, Dan ZHANG. Preparation and Properties of Reactive Powder Concrete with Circulating Fluidized Bed Combustion Fly Ash[J]. Chinese Journal of Materials Research, 2014, 28(1): 59-66.

全文: PDF(2912 KB) HTML

摘要:

进行掺固硫灰活性粉末混凝土(RPC)配合比的正交设计试验, 研究了养护制度对掺固硫灰RPC强度和收缩性能的影响以及固硫灰对RPC收缩性能的影响。结果表明: 应用固硫灰、硅灰、高效减水剂、中级石英砂、PO42.5R及湿热养护工艺, 可配制出抗折强度26 MPa、抗压强度140 MPa的活性粉末混凝土; 湿热养护可促进掺固硫灰RPC的水化, 形成较致密的结构, 其早期强度比标准养护高30 MPa左右, 但高温使早期形成的AFt转变成AFm, 故后期的强度有所倒缩; 与标准养护相比, 湿热养护促进掺固硫灰RPC的早期收缩, 降低了其后期干缩, 但总体收缩率仍大于标准养护; 固硫灰的膨胀性特性可有效改善RPC自收缩大的缺点。

关键词 ：无机非金属材料, 固硫灰, 活性粉末混凝土, 养护制度, 强度, 收缩率

Abstract：

The mix proportion design of reactive powder concrete (RPC) with circulating fluidized bed combustion (CFBC) fly ash was done through orthogonal design. The effect of curing system on strength and shrinkage property of RPC with CFBC fly ash, and the effect of CFBC fly ash on shrinkage property of RPC were investigated. The results show that RPC which could have flexural strength of 26 MPa and compressive strength of 140 MPa was prepared by using CFBC fly ash, silica fume, superplasticizer, intermediate quartz sand, PO42.5R and hydrothermal curing treatment; Hydrothermal curing can promote the hydration of RPC with CFBC fly ash and form a relatively dense structure, so its early strength was higher than that of standard curing about 30 MPa, but high temperature made early-formed AFt transform into AFm, so later strength was decreased; Compared to standard curing, Hydrothermal curing promoted the early shrinkage of RPC with CFBC fly ash, reduced the late drying shrinkage, but its overall shrinkage rate was still greater than that of standard curing; The expansibility characteristics of CFBC fly ash can effectively reduce the large self-shrinkage of RPC.

Key words： inorganic non-metallic material CFBC fly ash RPC curing system strength shrinkage rate

收稿日期: 2013-07-12

基金资助:* 十二五国家科技支撑计划2011BAA04B04(11zg410105)和四川省科技支撑计划11zs2116 资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.493 或 https://www.cjmr.org/CN/Y2014/V28/I1/59

表1 原料的化学组成

图1 固硫灰的XRD谱

表2 试验因素及水平

表3 正交试验和结果

图2 强度之和K值与各因素掺量的关系

表4 不同养护制度下掺固硫灰RPC的强度

图3 不同养护制度下掺固硫灰RPC水化7 d的SEM像

图4 不同养护制度下掺固硫灰RPC的收缩率及干缩率

图5 不同养护制度下掺固硫灰RPC水化3 d的XRD谱

图6 不同养护制度下掺固硫灰RPC水化7 d的差热分析图

表5 RPC中胶凝材料的比例及收缩率

图7 3组RPC的收缩率

图8 3组RPC水化7 d的SEM像

图9 3 组RPC的水化3 d的XRD谱

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