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A platform for research: civil engineering, architecture and urbanism
Preparation method of ultrahigh pumping machine-made sand high-strength concrete
The invention belongs to the technical field of constructional engineering, and relates to a preparation method of ultrahigh pumping machine-made sand high-strength concrete. According to the technical key points, the method comprises the following steps: S1, determining a water-binder ratio according to a concrete strength grade of concrete engineering design; S2, determining performance technical requirements of a concrete mixture according to the concrete pumping height; S3, according to the strength grade of concrete and the performance requirement of the mixture, determining the performance requirement of machine-made sand, the total amount of a cementing material and the total mixing amount of a mineral admixture; S4, determining the grading of powder particles of the cementing material according to a close packing principle; S5, determining the type and the mixing amount of the mineral admixture by testing the viscosity of the neat paste; S6, obtaining multi-groups concrete mix proportions by optimizing gradation of broken stones, trial-mixing concrete and adjusting the sand ratio and the use amount of a water reducing agent; and S7, by comprehensively comparing the properties and mechanical properties of the mixture, preferably selecting the mix proportion of the ultrahigh pumping machine-made sand high-strength concrete. The high-strength machine-made sand concrete meeting ultrahigh pumping is prepared, and the viscosity of a machine-made sand high-strength concrete mixture is remarkably reduced.
本发明属于建筑工程技术领域，涉及一种超高泵送机制砂高强混凝土的制备方法。其技术要点如下：S1、依据混凝土工程设计的混凝土强度等级，确定水胶比；S2、根据混凝土泵送高度确定混凝土拌合物性能技术要求；S3、根据混凝土强度等级和拌合物性能要求，确定机制砂性能要求、胶凝材料总量和矿物掺合料总掺量；S4、根据紧密堆积原理确定胶凝材料粉体颗粒的级配；S5、通过测试净浆的黏度确定矿物掺合料种类和掺量；S6、通过优化碎石级配，试配混凝土，调整砂率、减水剂用量，获得多组混凝土配合比；S7、通过综合比较拌合物性能和力学性能，优选出所述超高泵送机制砂高强混凝土配合比。本发明制备出满足超高泵送的高强机制砂混凝土，显著降低机制砂高强混凝土拌合物的黏度。
Preparation method of ultrahigh pumping machine-made sand high-strength concrete
The invention belongs to the technical field of constructional engineering, and relates to a preparation method of ultrahigh pumping machine-made sand high-strength concrete. According to the technical key points, the method comprises the following steps: S1, determining a water-binder ratio according to a concrete strength grade of concrete engineering design; S2, determining performance technical requirements of a concrete mixture according to the concrete pumping height; S3, according to the strength grade of concrete and the performance requirement of the mixture, determining the performance requirement of machine-made sand, the total amount of a cementing material and the total mixing amount of a mineral admixture; S4, determining the grading of powder particles of the cementing material according to a close packing principle; S5, determining the type and the mixing amount of the mineral admixture by testing the viscosity of the neat paste; S6, obtaining multi-groups concrete mix proportions by optimizing gradation of broken stones, trial-mixing concrete and adjusting the sand ratio and the use amount of a water reducing agent; and S7, by comprehensively comparing the properties and mechanical properties of the mixture, preferably selecting the mix proportion of the ultrahigh pumping machine-made sand high-strength concrete. The high-strength machine-made sand concrete meeting ultrahigh pumping is prepared, and the viscosity of a machine-made sand high-strength concrete mixture is remarkably reduced.
本发明属于建筑工程技术领域，涉及一种超高泵送机制砂高强混凝土的制备方法。其技术要点如下：S1、依据混凝土工程设计的混凝土强度等级，确定水胶比；S2、根据混凝土泵送高度确定混凝土拌合物性能技术要求；S3、根据混凝土强度等级和拌合物性能要求，确定机制砂性能要求、胶凝材料总量和矿物掺合料总掺量；S4、根据紧密堆积原理确定胶凝材料粉体颗粒的级配；S5、通过测试净浆的黏度确定矿物掺合料种类和掺量；S6、通过优化碎石级配，试配混凝土，调整砂率、减水剂用量，获得多组混凝土配合比；S7、通过综合比较拌合物性能和力学性能，优选出所述超高泵送机制砂高强混凝土配合比。本发明制备出满足超高泵送的高强机制砂混凝土，显著降低机制砂高强混凝土拌合物的黏度。
Preparation method of ultrahigh pumping machine-made sand high-strength concrete
一种超高泵送机制砂高强混凝土的制备方法
CAO YONG (author) / LENG FAGUANG (author) / TANG GUOFANG (author) / WANG JING (author) / WANG XIAOYAN (author) / GAO CHAO (author) / LI PENG (author) / SONG PUTAO (author) / LIU GUISHUANG (author) / LIU ZONGXIN (author)
2022-02-01
Patent
Electronic Resource
Chinese
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