Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Magnesium oxide composite expanding agent and preparation method thereof
The invention discloses a magnesium oxide composite expanding agent and a preparation method thereof. The magnesium oxide composite expanding agent comprises the following components in parts by weight: 25-35 parts of magnesite, 15-20 parts of dolomite, 18-27 parts of bauxite, 21-33 parts of gypsum and 4-8 parts of limestone. The preparation method of the magnesium oxide composite expanding agentcomprises the following steps: uniformly mixing magnesite, dolomite and limestone, putting into a muffle furnace, calcining at 850-1050 DEG C for 60 minutes, taking out and cooling the mixture, pulverizing the sintered mixture, bauxite and gypsum into specified fineness by a ball mill, and uniformly mixing the components to obtain the magnesium oxide composite expanding agent. In the invention, bauxite and gypsum are doped into the magnesium oxide expanding agent, so that the early-stage expanding effect is improved, the expanding time of the magnesium oxide expanding agent is later, cracks caused by later-stage dry shrinkage of concrete are prevented, and the expanding effect is improved.
本发明公开了一种氧化镁复合膨胀剂及其制备方法，包括以下重量百分比组分：菱镁矿25份‑35份，白云石15份‑20份，铝矾土18份‑27份，石膏21份‑33份，石灰石4份‑8份。本氧化镁复合膨胀剂的制备方法为：将菱镁矿，白云石和石灰石均匀混合后放入马弗炉中，在850℃‑1050℃的温度下煅烧60min后取出，冷却后将烧制后的混合物以及铝矾土，石膏经球磨机粉碎至规定细度并均匀混合得到氧化镁复合膨胀剂。本发明中所述氧化镁复合膨胀剂，通过向氧化镁膨胀剂中掺入铝矾土和石膏，提高了早期膨胀效果，而氧化镁膨胀剂本身的膨胀时间较晚，防止了混凝土后期干缩产生裂缝，使得膨胀效果得到提高。
Magnesium oxide composite expanding agent and preparation method thereof
The invention discloses a magnesium oxide composite expanding agent and a preparation method thereof. The magnesium oxide composite expanding agent comprises the following components in parts by weight: 25-35 parts of magnesite, 15-20 parts of dolomite, 18-27 parts of bauxite, 21-33 parts of gypsum and 4-8 parts of limestone. The preparation method of the magnesium oxide composite expanding agentcomprises the following steps: uniformly mixing magnesite, dolomite and limestone, putting into a muffle furnace, calcining at 850-1050 DEG C for 60 minutes, taking out and cooling the mixture, pulverizing the sintered mixture, bauxite and gypsum into specified fineness by a ball mill, and uniformly mixing the components to obtain the magnesium oxide composite expanding agent. In the invention, bauxite and gypsum are doped into the magnesium oxide expanding agent, so that the early-stage expanding effect is improved, the expanding time of the magnesium oxide expanding agent is later, cracks caused by later-stage dry shrinkage of concrete are prevented, and the expanding effect is improved.
本发明公开了一种氧化镁复合膨胀剂及其制备方法，包括以下重量百分比组分：菱镁矿25份‑35份，白云石15份‑20份，铝矾土18份‑27份，石膏21份‑33份，石灰石4份‑8份。本氧化镁复合膨胀剂的制备方法为：将菱镁矿，白云石和石灰石均匀混合后放入马弗炉中，在850℃‑1050℃的温度下煅烧60min后取出，冷却后将烧制后的混合物以及铝矾土，石膏经球磨机粉碎至规定细度并均匀混合得到氧化镁复合膨胀剂。本发明中所述氧化镁复合膨胀剂，通过向氧化镁膨胀剂中掺入铝矾土和石膏，提高了早期膨胀效果，而氧化镁膨胀剂本身的膨胀时间较晚，防止了混凝土后期干缩产生裂缝，使得膨胀效果得到提高。
Magnesium oxide composite expanding agent and preparation method thereof
一种氧化镁复合膨胀剂及其制备方法
MIAO RUIWEN (Autor:in)
17.11.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
| Europäisches Patentamt | 2020
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