掺花岗岩粉RPC的力学性能及微观结构研究-《混凝土与水泥制品》杂志社

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掺花岗岩粉RPC的力学性能及微观结构研究

Mechanical Properties of RPC(Reactive Powder Concrete) with Granite Powder and Micro-structure Study

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关键词：

花岗岩粉；活性粉末混凝土；力学性能；微观结构

Key words：

Granite powder; Reactive powder concrete; Mechanical properties; Micro-structure

刊期：

２０16年第8期

DOI：

文章编号：

1000-4637（2016）08-08-07

基金项目：

作者：

程棋锋1,2

单位：

1.华侨大学土木工程学院，厦门 361021；2.合诚工程咨询股份有限公司，厦门 361009）

摘要

摘要：通过测试不同花岗岩粉取代率的RPC在标准养护制度下力学性能的变化规律及微观结构的变化，研究了不同花岗岩粉取代率对RPC力学性能及微观结构的影响。结果表明，在标准养护条件下，随着花岗岩粉取代率的增加，与未取代的对比组相比较，RPC的力学性能能够满足取代前的要求；花岗岩粉完全取代石英粉标准养护28d后，只掺花岗岩粉的RPC组与只掺石英粉的基准组RPC，水化产物的微观形貌均以长度约3μm的针棒状C-S-H为主，两者的水化产物Ca/Si相差很小；标准养护RPC的孔结构以无害孔、少害孔为主。

Abstract: Based on the test of reactive powder concrete (RPC) with different granite powder replacement ratios, the mechanical properties and micro-structural effect on the standard curing RPC were investigated. Results show that, under the condition of standard curing, along with the increase of granite powder replacement ratio, the mechanical properties of RPC can satisfy the requirements of the former. After standard curing 28d, granite powder completely replaces quartz powder, compared with the case of no replacing, the microstructure of hydration products is given priority to the needle bar of C-S-H, which the length of the C-S-H is about 3μm with slightly different in Ca/Si ratio. Standard curing RPC pore structure is given priority to with harmless hole and little hole. The RPC pore structure was improved after quartz powder was replaced by granite powder.

结论

（1）标准养护制度下，采用花岗岩粉完全取代石英粉用于RPC后，RPC的力学性能不会降低，基本维持在原来的水平。

（2）标准养护28d，掺花岗岩粉RPC的水化产物微观形貌以长度约3μm的针棒状C-S-H为主、水化产物Ca/Si在1.158。

（3）标准养护28d，掺花岗岩粉RPC的最可几孔径为2nm，平均孔径为10.50nm，累计孔体积为0.003938mL/g，孔隙以20nm以下无害孔为主。

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