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不同产地机制砂对UHPC性能的影响
Influence of manufactured sands from different regions on UHPC performance
2023年第8期
超高性能混凝土;机制砂;流动性;抗压强度;抗折强度
Ultra-high performance concrete; Manufactured sand; Fluidity; Compressive strength; Flexural strength
2023年第8期
10.19761/j.1000-4637.2023.08.020.06
国家自然科学基金高铁联合项目(U1934205);甘肃省建设科技攻关项目(JK2021-03);甘肃省交通运输厅科研项目(2022-26);中央引导地方科技发展资金项目(22ZY1QA005)。
蔺鹏臻1,李 永2
1.兰州交通大学 土木工程学院,甘肃 兰州 730070;2.甘肃林业职业技术学院,甘肃 天水 741020

蔺鹏臻1,李 永2

蔺鹏臻,李永.不同产地机制砂对UHPC性能的影响[J].混凝土与水泥制品,2023(8):20-25.

LIN P Z,LI Y.Influence of manufactured sands from different regions on UHPC performance[J].China Concrete and Cement Products,2023(8):20-25.

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摘   要:对比了甘肃本地五大产地机制砂的基本性能,研究了不同产地机制砂对UHPC性能的影响。结果表明:不同产地机制砂由于原石的不同,性能会存在一定差异,其中差异最为突出的是压碎值,最大相差高达80%;不同产地机制砂制备UHPC的7 d抗压强度在112.80~161.60 MPa间、28 d抗压强度在102.50~153.80 MPa间;不同产地机制砂制备UHPC的7 d抗折强度在22.00~29.10 MPa间、28 d抗折强度在22.80~29.20 MPa间;不同产地机制砂UHPC的微观结构和水化产物也存在一定差异,但微观结构基本为孔隙率较小的致密结构。在UHPC材料设计与质量控制中,应考虑机制砂产地的差异性。 Abstract: The basic properties of five major local production regions of manufactured sand in Gansu were compared, and the impact of manufactured sand from different production regions on the performance of UHPC was studied. The results show that there are certain differences in the performance of manufactured sands from different production regions due to the different raw stones, among which the most prominent difference is the crushing value, with a maximum difference of 80% in the crushing value of manufactured sands from different production regions. The 7 d compressive strength of UHPC prepared with manufactured sands from different production regions ranges from 112.80 MPa to 161.60 MPa, and the 28 d compressive strength ranges from 102.50 MPa to 153.80 MPa. The 7 d flexural strength of UHPC prepared with manufactured sands from different production regions ranges from 22.00 MPa to 29.10 MPa, and the 28 d flexural strength ranges from 22.80 MPa to 29.20 MPa. There are also certain differences in the microstructure and hydration products of UHPC prepared with manufactured sands from different production regions, but the microstructure is basically a dense structure with low porosity. In UHPC material design and quality control, it is necessary to consider the differences of manufactured sands production regions.
英文名 : Influence of manufactured sands from different regions on UHPC performance
刊期 : 2023年第8期
关键词 : 超高性能混凝土;机制砂;流动性;抗压强度;抗折强度
Key words : Ultra-high performance concrete; Manufactured sand; Fluidity; Compressive strength; Flexural strength
刊期 : 2023年第8期
DOI : 10.19761/j.1000-4637.2023.08.020.06
文章编号 :
基金项目 : 国家自然科学基金高铁联合项目(U1934205);甘肃省建设科技攻关项目(JK2021-03);甘肃省交通运输厅科研项目(2022-26);中央引导地方科技发展资金项目(22ZY1QA005)。
作者 : 蔺鹏臻1,李 永2
单位 : 1.兰州交通大学 土木工程学院,甘肃 兰州 730070;2.甘肃林业职业技术学院,甘肃 天水 741020

蔺鹏臻1,李 永2

蔺鹏臻,李永.不同产地机制砂对UHPC性能的影响[J].混凝土与水泥制品,2023(8):20-25.

LIN P Z,LI Y.Influence of manufactured sands from different regions on UHPC performance[J].China Concrete and Cement Products,2023(8):20-25.

摘要
参数
结论
参考文献
引用本文

摘   要:对比了甘肃本地五大产地机制砂的基本性能,研究了不同产地机制砂对UHPC性能的影响。结果表明:不同产地机制砂由于原石的不同,性能会存在一定差异,其中差异最为突出的是压碎值,最大相差高达80%;不同产地机制砂制备UHPC的7 d抗压强度在112.80~161.60 MPa间、28 d抗压强度在102.50~153.80 MPa间;不同产地机制砂制备UHPC的7 d抗折强度在22.00~29.10 MPa间、28 d抗折强度在22.80~29.20 MPa间;不同产地机制砂UHPC的微观结构和水化产物也存在一定差异,但微观结构基本为孔隙率较小的致密结构。在UHPC材料设计与质量控制中,应考虑机制砂产地的差异性。

Abstract: The basic properties of five major local production regions of manufactured sand in Gansu were compared, and the impact of manufactured sand from different production regions on the performance of UHPC was studied. The results show that there are certain differences in the performance of manufactured sands from different production regions due to the different raw stones, among which the most prominent difference is the crushing value, with a maximum difference of 80% in the crushing value of manufactured sands from different production regions. The 7 d compressive strength of UHPC prepared with manufactured sands from different production regions ranges from 112.80 MPa to 161.60 MPa, and the 28 d compressive strength ranges from 102.50 MPa to 153.80 MPa. The 7 d flexural strength of UHPC prepared with manufactured sands from different production regions ranges from 22.00 MPa to 29.10 MPa, and the 28 d flexural strength ranges from 22.80 MPa to 29.20 MPa. There are also certain differences in the microstructure and hydration products of UHPC prepared with manufactured sands from different production regions, but the microstructure is basically a dense structure with low porosity. In UHPC material design and quality control, it is necessary to consider the differences of manufactured sands production regions.

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(1)不同产地机制由于原石的差异,圆形度、针棒状程度、表观密度、压碎值、MB值均存在一定差异,而且这五种机制砂的性能指标均符合相关标准要求。
(2)不同产地机制砂UHPC的流动性差异相对较小;不同产地机制砂UHPC的7 d抗压强度在112.80~161.60 MPa间、28 d抗压强度在102.50~153.80 MPa间,7 d抗折强度在22.00~29.10 MPa间、28 d抗折强度在22.80~29.20 MPa间。
(3)整体上,不同产地机制砂UHPC的微观结构均比较致密,水化产物中除均存在C-S-H外,其他水化产物存在一定的差异。
(4)采用圆形度>0.752、堆积密度>1 418kg/m3、压碎指标<9.1%、MB值<1.0 g/kg的机制砂,可以制备出工作性和力学性能较好的UHPC。

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蔺鹏臻,李永.不同产地机制砂对UHPC性能的影响[J].混凝土与水泥制品,2023(8):20-25.

LIN P Z,LI Y.Influence of manufactured sands from different regions on UHPC performance[J].China Concrete and Cement Products,2023(8):20-25.

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