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A platform for research: civil engineering, architecture and urbanism
Composite admixture for shotcrete as well as preparation method and application of composite admixture
The invention discloses a composite admixture for shotcrete as well as a preparation method and application of the composite admixture, and belongs to the technical field of building materials. The composite admixture comprises the following raw material components in percentage by mass: 50-70% of fly ash, 15-25% of superfine silica fume, 5-15% of metakaolin, 0-5% of calcined gypsum. 0-5% of alpha-Al2O3, and 0-10% of a surfactant, wherein the fly ash is II-grade low-calcium fly ash, the superfine silica fume has an average particle size smaller than 10 microns and a content of SiO2 larger thanor equal to 95.0%, the average particle size of the metakaolin is less than 5 [mu]m, and the average particle size of the alpha-Al2O3 nano powder is less than 50nm. When the composite admixture is used as one of cementing materials to prepare shotcrete, the resilience rate of the prepared shotcrete is less than or equal to 7%, the setting time is less than or equal to 4 minutes, and the sulfuricacid corrosion resistance grade is more than KS150. Compared with the high rebound rate of the concrete in the prior art, the rebound rate of the concrete designed by the invention is greatly reduced.
本发明公开了一种喷射混凝土用复合掺和料及其制备方法与应用，属于建筑用材料技术领域。该复合掺和料包括如下质量百分比的各原料组分：粉煤灰：50～70％，超细硅灰：15～25％，偏高岭土：5～15％，熟石膏：0～5％；α‑Al2O3：0～5％；表面活性剂；0～10％；其中，粉煤灰为II级低钙粉煤灰，超细硅灰的平均粒径小于10μm，SiO2含量≥95.0％；偏高岭土的平均粒径小于5μm，α‑Al2O3纳米粉的平均粒径小于50nm。将该复合掺和料作为胶凝材料之一制备喷射混凝土，所制备的喷射混凝土回弹率≤7％、凝结时间≤4min、抗硫酸侵蚀等级＞KS150。相较于现有技术中混凝土较高的回弹率，本发明设计的混凝土回弹率大幅下降。
Composite admixture for shotcrete as well as preparation method and application of composite admixture
The invention discloses a composite admixture for shotcrete as well as a preparation method and application of the composite admixture, and belongs to the technical field of building materials. The composite admixture comprises the following raw material components in percentage by mass: 50-70% of fly ash, 15-25% of superfine silica fume, 5-15% of metakaolin, 0-5% of calcined gypsum. 0-5% of alpha-Al2O3, and 0-10% of a surfactant, wherein the fly ash is II-grade low-calcium fly ash, the superfine silica fume has an average particle size smaller than 10 microns and a content of SiO2 larger thanor equal to 95.0%, the average particle size of the metakaolin is less than 5 [mu]m, and the average particle size of the alpha-Al2O3 nano powder is less than 50nm. When the composite admixture is used as one of cementing materials to prepare shotcrete, the resilience rate of the prepared shotcrete is less than or equal to 7%, the setting time is less than or equal to 4 minutes, and the sulfuricacid corrosion resistance grade is more than KS150. Compared with the high rebound rate of the concrete in the prior art, the rebound rate of the concrete designed by the invention is greatly reduced.
本发明公开了一种喷射混凝土用复合掺和料及其制备方法与应用，属于建筑用材料技术领域。该复合掺和料包括如下质量百分比的各原料组分：粉煤灰：50～70％，超细硅灰：15～25％，偏高岭土：5～15％，熟石膏：0～5％；α‑Al2O3：0～5％；表面活性剂；0～10％；其中，粉煤灰为II级低钙粉煤灰，超细硅灰的平均粒径小于10μm，SiO2含量≥95.0％；偏高岭土的平均粒径小于5μm，α‑Al2O3纳米粉的平均粒径小于50nm。将该复合掺和料作为胶凝材料之一制备喷射混凝土，所制备的喷射混凝土回弹率≤7％、凝结时间≤4min、抗硫酸侵蚀等级＞KS150。相较于现有技术中混凝土较高的回弹率，本发明设计的混凝土回弹率大幅下降。
Composite admixture for shotcrete as well as preparation method and application of composite admixture
喷射混凝土用复合掺和料及其制备方法与应用
CHENG SHUKAI (author) / LI SHUNKAI (author) / TU LIUQING (author) / WANG HUAWEN (author) / LUO WANYUE (author)
2021-03-05
Patent
Electronic Resource
Chinese
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