石灰石粉作为矿物掺合料对机制砂混凝土力学性能及耐久性的影响

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中文摘要：石灰石粉可作为机制砂细粉料或矿物掺合料两种途径掺入混凝土中,然而两种不同掺入途径对混凝土的配合比设计及其性能影响截然不同.基于我国某桥梁工程机制砂混凝土的实际应用需求与服役环境特征,通过测试不同石灰石粉掺量下的机制砂混凝土工作性、抗压强度与氯离子扩散系数,对石灰石粉作为单一矿物掺合料制备承台、挡土墙和索塔用机制砂混凝土的可行性进行了分析.研究结果表明:随着石粉掺量增加,机制砂混凝土的抗压强度性能呈现下降趋势,可降低水胶比以保障混凝土强度;石粉会提高C30机制砂混凝土的氯离子迁移系数,但对C50机制砂混凝土的氯离子迁移系数影响较小.初步认为石粉作为矿物掺合料用于不同类型机制砂混凝土具有可行性,更高掺量的石粉对机制砂混凝土耐久性的影响有待进一步探究.

外文标题：Effect of limestone powder as mineral admixture on mechanical properties and durability of concrete with manufactured sand

外文摘要：Limestone powder can be mixed into concrete as fine powder of manufactured sand or mineral admixture,however,the two different mixing ways have different effects on the mix design and performance of concrete.According to the practical application requirements of concrete for a bridge,the feasibility of using limestone powder as the mineral admixture to prepare concrete with manufactured sand for caps,retaining walls and towers were analyzed.For this purpose,the workability,compressive strength and chloride transport coefficient of concrete with various amounts of limestone powder were measured.Results show that the compressive strength of concrete with manufactured sand show a downward trend with the increase of stone powder content,whereas the negative impact of stone powder on strength can be compensated by reducing the water-binder ratio.The stone powder increases the chloride transport coefficient of C30 concrete while showing little influence on that of C50 concrete.It is preliminarily inferred that stone powder can be used as mineral admixture for different types of manufactured sand concrete.The effect of larger amount of stone powder on the durability of concrete with manufactured sand needs further investigation.

外文关键词：

limestone powderconcrete with manufactured sandadmixture materialsmechanical propertiesdurability

作者：

李汪阳、程磊科、刘慧慧、母进伟、张克永、任强、蒋正武

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作者单位：

同济大学先进土木工程材料教育部重点实验室材料科学与工程学院,上海 201804

安徽省交通控股集团有限公司,安徽合肥 230088

贵州桥梁建设集团有限责任公司,贵州贵阳 550001

关键词：

石灰石粉机制砂混凝土矿物掺合料力学性能耐久性

基金：

国家自然科学基金国家自然科学基金中央高校基本科研业务费专项安徽省交通控股集团有限公司科技项目贵州省交通运输厅科技项目宁波市重大科技攻关暨揭榜挂帅项目

项目编号：

5187848052078369JKKJ-2019-012022-122-0242022Z030

出版年：

2024

DOI：

10.3969/j.issn.1002-3550.2024.07.019

混凝土

中国建筑东北设计研究院有限公司

混凝土

CSTPCD北大核心

影响因子：0.844

ISSN：1002-3550

年,卷(期)：2024.(7)