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机制砂、石对混凝土性能的影响
Effect of manufactured sand and stone on the performance of concrete
2025年第2期
花岗岩洞渣;机制砂、石;混凝土骨料;设计强度等级;工作性;力学性能
Granite cave slag; Manufactured sand and stone; Concrete aggregate; Design strength grade; Workability; Mechanical property
2025年第2期
10.19761/j.1000-4637.2025.02.087.05
郭志超
中交一公局第一工程有限公司,北京 102205

郭志超

郭志超.机制砂、石对混凝土性能的影响[J].混凝土与水泥制品,2025(2):87-90,96.

GUO Z C.Effect of manufactured sand and stone on the performance of concrete[J].China Concrete and Cement Products,2025(2):87-90,96.

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摘   要:研究了花岗岩机制砂、机制碎石对不同设计强度等级(C20、C30、C40、C50)混凝土凝结时间、抗压强度、劈裂抗拉强度和抗折强度的影响。结果表明:相较于天然骨料组试件,不论混凝土的设计强度等级多大,机制碎石、机制砂单一取代或同时取代天然骨料均降低了混凝土的凝结时间、28 d抗压强度、28 d劈裂抗拉强度和28 d抗折强度,其中,机制碎石单一取代天然碎石对混凝土力学性能的削弱作用基本最小,机制砂单一取代河砂次之,机制碎石、机制砂同时取代天然骨料对混凝土力学性能的削弱作用最大;混凝土的设计强度等级越高,由机制骨料取代天然骨料导致的混凝土力学性能损失基本越小。 Abstract: The effects of granite manufactured sand and stone on setting time, compressive strength, splitting tensile strength and flexural strength of concrete with different design strength grades were investigated. The results show that, compared with the natural aggregates group specimens, regardless of the design strength grade of concrete, the single replacement or simultaneous replacement of natural aggregates by manufactured aggregates reduces the setting time, 28 d compressive strength, 28 d splitting tensile strength and 28 d flexural strength of concrete. Among which, the single replacement of natural stone by manufactured stone has the smallest weakening effect on the mechanical properties of concrete, followed by the single replacement of river sand by manufactured sand, and the simultaneous replacement of natural aggregates by manufactured stone and sand has the largest weakening effect on the mechanical properties of concrete. The higher the design strength grade of concrete, the basically smaller the loss of mechanical properties of the concrete resulting from the replacement of natural aggregates by manufactured aggregates.
英文名 : Effect of manufactured sand and stone on the performance of concrete
刊期 : 2025年第2期
关键词 : 花岗岩洞渣;机制砂、石;混凝土骨料;设计强度等级;工作性;力学性能
Key words : Granite cave slag; Manufactured sand and stone; Concrete aggregate; Design strength grade; Workability; Mechanical property
刊期 : 2025年第2期
DOI : 10.19761/j.1000-4637.2025.02.087.05
文章编号 :
基金项目 :
作者 : 郭志超
单位 : 中交一公局第一工程有限公司,北京 102205

郭志超

郭志超.机制砂、石对混凝土性能的影响[J].混凝土与水泥制品,2025(2):87-90,96.

GUO Z C.Effect of manufactured sand and stone on the performance of concrete[J].China Concrete and Cement Products,2025(2):87-90,96.

摘要
参数
结论
参考文献
引用本文

摘   要:研究了花岗岩机制砂、机制碎石对不同设计强度等级(C20、C30、C40、C50)混凝土凝结时间、抗压强度、劈裂抗拉强度和抗折强度的影响。结果表明:相较于天然骨料组试件,不论混凝土的设计强度等级多大,机制碎石、机制砂单一取代或同时取代天然骨料均降低了混凝土的凝结时间、28 d抗压强度、28 d劈裂抗拉强度和28 d抗折强度,其中,机制碎石单一取代天然碎石对混凝土力学性能的削弱作用基本最小,机制砂单一取代河砂次之,机制碎石、机制砂同时取代天然骨料对混凝土力学性能的削弱作用最大;混凝土的设计强度等级越高,由机制骨料取代天然骨料导致的混凝土力学性能损失基本越小。

Abstract: The effects of granite manufactured sand and stone on setting time, compressive strength, splitting tensile strength and flexural strength of concrete with different design strength grades were investigated. The results show that, compared with the natural aggregates group specimens, regardless of the design strength grade of concrete, the single replacement or simultaneous replacement of natural aggregates by manufactured aggregates reduces the setting time, 28 d compressive strength, 28 d splitting tensile strength and 28 d flexural strength of concrete. Among which, the single replacement of natural stone by manufactured stone has the smallest weakening effect on the mechanical properties of concrete, followed by the single replacement of river sand by manufactured sand, and the simultaneous replacement of natural aggregates by manufactured stone and sand has the largest weakening effect on the mechanical properties of concrete. The higher the design strength grade of concrete, the basically smaller the loss of mechanical properties of the concrete resulting from the replacement of natural aggregates by manufactured aggregates.

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(1)相较于天然骨料组试件,机制碎石或机制砂作为骨料均降低了不同设计强度等级混凝土的凝结时间,但二者的影响程度较接近,而机制碎石和机制砂同时作为骨料会明显降低混凝土的凝结时间。
(2)以天然骨料组试件为基准组,机制碎石、机制砂单一取代天然骨料或同时取代天然骨料均降低了不同设计强度等级混凝土的28 d抗压强度、劈裂抗拉强度、抗折强度;骨料取代情况对混凝土28 d抗压强度、劈裂抗拉强度、抗折强度削弱效果的大小顺序均为:机制碎石单一取代天然碎石<机制砂单一取代河砂<机制碎石、机制砂同时取代天然骨料。
(3)在实际工程应用中,通过合理控制机制骨料配比生产得到的混凝土的性能可与天然骨料混凝土相当。

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郭志超.机制砂、石对混凝土性能的影响[J].混凝土与水泥制品,2025(2):87-90,96.

GUO Z C.Effect of manufactured sand and stone on the performance of concrete[J].China Concrete and Cement Products,2025(2):87-90,96.

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