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A platform for research: civil engineering, architecture and urbanism
Alkali-free fluorine-free chlorine-free liquid concrete accelerator and preparation method thereof
The invention discloses an alkali-free fluorine-free chlorine-free liquid concrete accelerator and a preparation method thereof, and relates to the technical field of environment-friendly concrete accelerators. The raw materials comprise 45%-55% of aluminum sulfate, 1.5%-2.5% of a modification regulator, 3.5%-5% of diethanol amine, 2%-2.5% of magnesium sulfate, 1%-3% of calcium formate, 1%-2% of urea, and the balance of water. The preparation method comprises the following steps: weighing the raw materials according to the ratio, adding water into a reaction kettle, stirring while heating, and gradually adding aluminum sulfate; after the temperature is controlled to be 55-65 DEG C, sequentially adding magnesium sulfate and calcium formate according to metering every 5-8 min, and carrying out continuous stirring reaction for 1.5-2 h; and naturally cooling to normal temperature, adding urea, the modified regulator and diethanol amine, stirring for 20-30 minutes, and controlling the pH value of the accelerator solution to be 2.5-3, thereby obtaining the finished liquid concrete accelerator. The finished product is transparent and uniform liquid, the density is 1.15 g/cm < 3 >1.2 g/cm < 3 >, and the alkali-aggregate reaction risk of the concrete can be greatly reduced; and all the raw materials do not contain chloride ions, fluorine ions and sodium ions, and erosion of the raw materials to the reinforced concrete is reduced.
本发明公开了一种无碱无氟无氯液态混凝土速凝剂及其制备方法，涉及环保型混凝土速凝剂技术领域。原料为硫酸铝45％～55％，改性调节剂1.5％～2.5％，二乙醇胺3.5％～5％，硫酸镁2％～2.5％，甲酸钙1％～3％，尿素1％～2％。其余为水。按原料配比称重，先将水加入反应釜中，边加热边搅拌并逐渐加入硫酸铝；温度控制在55℃～65℃后，每隔5min～8min按计量依次加入硫酸镁、甲酸钙，持续搅拌反应1.5～2h；自然冷却至常温后加入尿素、改性调节剂以及二乙醇胺，再搅拌20min～30min，控制速凝剂溶液pH为2.5～3，得到成品的液态混凝土速凝剂。成品为透明均一液体，密度为1.15g/cm3～1.2g/cm3，可大大降低混凝土碱‑骨料反应风险，所有原料均不含氯离子、氟离子、钠离子，降低其对钢筋混凝土的侵蚀。
Alkali-free fluorine-free chlorine-free liquid concrete accelerator and preparation method thereof
The invention discloses an alkali-free fluorine-free chlorine-free liquid concrete accelerator and a preparation method thereof, and relates to the technical field of environment-friendly concrete accelerators. The raw materials comprise 45%-55% of aluminum sulfate, 1.5%-2.5% of a modification regulator, 3.5%-5% of diethanol amine, 2%-2.5% of magnesium sulfate, 1%-3% of calcium formate, 1%-2% of urea, and the balance of water. The preparation method comprises the following steps: weighing the raw materials according to the ratio, adding water into a reaction kettle, stirring while heating, and gradually adding aluminum sulfate; after the temperature is controlled to be 55-65 DEG C, sequentially adding magnesium sulfate and calcium formate according to metering every 5-8 min, and carrying out continuous stirring reaction for 1.5-2 h; and naturally cooling to normal temperature, adding urea, the modified regulator and diethanol amine, stirring for 20-30 minutes, and controlling the pH value of the accelerator solution to be 2.5-3, thereby obtaining the finished liquid concrete accelerator. The finished product is transparent and uniform liquid, the density is 1.15 g/cm < 3 >1.2 g/cm < 3 >, and the alkali-aggregate reaction risk of the concrete can be greatly reduced; and all the raw materials do not contain chloride ions, fluorine ions and sodium ions, and erosion of the raw materials to the reinforced concrete is reduced.
本发明公开了一种无碱无氟无氯液态混凝土速凝剂及其制备方法，涉及环保型混凝土速凝剂技术领域。原料为硫酸铝45％～55％，改性调节剂1.5％～2.5％，二乙醇胺3.5％～5％，硫酸镁2％～2.5％，甲酸钙1％～3％，尿素1％～2％。其余为水。按原料配比称重，先将水加入反应釜中，边加热边搅拌并逐渐加入硫酸铝；温度控制在55℃～65℃后，每隔5min～8min按计量依次加入硫酸镁、甲酸钙，持续搅拌反应1.5～2h；自然冷却至常温后加入尿素、改性调节剂以及二乙醇胺，再搅拌20min～30min，控制速凝剂溶液pH为2.5～3，得到成品的液态混凝土速凝剂。成品为透明均一液体，密度为1.15g/cm3～1.2g/cm3，可大大降低混凝土碱‑骨料反应风险，所有原料均不含氯离子、氟离子、钠离子，降低其对钢筋混凝土的侵蚀。
Alkali-free fluorine-free chlorine-free liquid concrete accelerator and preparation method thereof
一种无碱无氟无氯液态混凝土速凝剂及其制备方法
LIU BO (author) / LI ZHIXIANG (author) / MA HANG (author) / ZHANG YINGHU (author)
2022-02-18
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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