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Concrete filling material for coal mine underground gob-side entry retaining and preparation method thereof
The invention discloses a concrete filling material for coal mine underground gob-side entry retaining and a preparation method thereof. The filling material comprises the following components: 100 parts of cement by weight, 20-40 parts of machine-made sand by weight, 5-12 parts of silica fume by weight, 10-25 parts of fly ash by weight, 3-15 parts of bentonite by weight, 0.2-6.0 parts of an early strength agent by weight, 0.3-1.2 parts of a defoaming agent by weight, 3-10 parts of an accelerator by weight, 0.2-2.0 parts of a naphthalene-based superplasticizer by weight, 2-15 parts of a polymer water absorbent by weight and 0.1-0.6% of a fiber material by volume, wherein the early strength agent is calcium chloride. With the concrete filling material adopted, the problems that an existing concrete filling material for underground coal miner gob-side entry retaining is low in mechanical strength and early strength, cannot be coordinated with mining in strength, is large in usage amount, and low in the anti-cracking performance can be solved .
本发明公开了一种煤矿井下沿空留巷用混凝土充填材料及其制备方法。所述充填材料组分包括：水泥100重量份、机制砂20‑40重量份、硅灰5‑12重量份、粉煤灰10‑25重量份、膨润土3‑15重量份、早强剂0.2‑6.0重量份、消泡剂0.3‑1.2重量份、速凝剂3‑10重量份、萘系高效减水剂0.2‑2.0重量份、高分子吸水剂2‑15重量份和纤维材料0.1‑0.6％体积百分比。其中，早强剂是氯化钙。该混凝土充填材料能够解决现有煤矿井下沿空留巷用混凝土充填材料的机械强度和早期强度不高，材料的强度不能与采矿相协调，材料使用量很大，抗裂性能低的问题。
Concrete filling material for coal mine underground gob-side entry retaining and preparation method thereof
The invention discloses a concrete filling material for coal mine underground gob-side entry retaining and a preparation method thereof. The filling material comprises the following components: 100 parts of cement by weight, 20-40 parts of machine-made sand by weight, 5-12 parts of silica fume by weight, 10-25 parts of fly ash by weight, 3-15 parts of bentonite by weight, 0.2-6.0 parts of an early strength agent by weight, 0.3-1.2 parts of a defoaming agent by weight, 3-10 parts of an accelerator by weight, 0.2-2.0 parts of a naphthalene-based superplasticizer by weight, 2-15 parts of a polymer water absorbent by weight and 0.1-0.6% of a fiber material by volume, wherein the early strength agent is calcium chloride. With the concrete filling material adopted, the problems that an existing concrete filling material for underground coal miner gob-side entry retaining is low in mechanical strength and early strength, cannot be coordinated with mining in strength, is large in usage amount, and low in the anti-cracking performance can be solved .
本发明公开了一种煤矿井下沿空留巷用混凝土充填材料及其制备方法。所述充填材料组分包括：水泥100重量份、机制砂20‑40重量份、硅灰5‑12重量份、粉煤灰10‑25重量份、膨润土3‑15重量份、早强剂0.2‑6.0重量份、消泡剂0.3‑1.2重量份、速凝剂3‑10重量份、萘系高效减水剂0.2‑2.0重量份、高分子吸水剂2‑15重量份和纤维材料0.1‑0.6％体积百分比。其中，早强剂是氯化钙。该混凝土充填材料能够解决现有煤矿井下沿空留巷用混凝土充填材料的机械强度和早期强度不高，材料的强度不能与采矿相协调，材料使用量很大，抗裂性能低的问题。
Concrete filling material for coal mine underground gob-side entry retaining and preparation method thereof
煤矿井下沿空留巷用混凝土充填材料及其制备方法
ZHANG WEIFANG (author) / WANG BINGFENG (author) / LI HONG (author)
2021-11-05
Patent
Electronic Resource
Chinese
Mining gob-side entry retaining high-water filling material and preparation method thereof
| European Patent Office | 2020
| European Patent Office | 2021