【摘要】：為了對磷酸鉀鎂水泥(MKPC)水化溫升和凝結(jié)時間進(jìn)行控制,將四水硝酸鈣摻入其中,研究了四水硝酸鈣對MKPC水化溫升、凝結(jié)時間及力學(xué)性能的影響,并結(jié)合XRD、SEM和熱分析等分析了四水硝酸鈣在MKPC中的作用機(jī)理。結(jié)果表明:在早期水化過程中,四水硝酸鈣將與硼砂反應(yīng)生成硼酸鈣,四水硝酸鈣摻量較少時,硼酸鈣的含量較少,緩凝效果不足,MKPC凝結(jié)時間略微縮短;繼續(xù)增大四水硝酸鈣的摻量,硼酸鈣以膜層的方式覆蓋在氧化鎂表面,阻滯水化反應(yīng)進(jìn)行,凝結(jié)時間大幅度延長。硼酸鈣的生成降低了漿體的流動度和水化產(chǎn)物的生成量,繼而對MKPC的力學(xué)性能產(chǎn)生負(fù)面影響。綜合考慮,四水硝酸鈣的摻量應(yīng)控制在4%左右。
文內(nèi)圖片：
圖片說明：MKPC水化溫升保溫裝置
[Abstract]:In order to control the hydration temperature and the setting time of the potassium phosphate cement (MKPC), the effect of calcium nitrate on the hydration temperature, the setting time and the mechanical properties of the MKPC was studied, and the XRD was combined. The mechanism of calcium nitrate in MKPC was analyzed by SEM and thermal analysis. The results show that, in the course of early hydration, calcium nitrate will react with borax to produce calcium borate, the content of calcium nitrate is less, the content of calcium borate is less, the setting time of MKPC is short, and the addition amount of calcium nitrate is continuously increased. The calcium borate is covered on the surface of the magnesium oxide in the form of a film layer, the hydration reaction is blocked, and the coagulation time is prolonged greatly. The generation of calcium borate reduces the fluidity of the slurry and the generation of the hydration product, which in turn has a negative effect on the mechanical properties of the mkpc. In general, the amount of calcium nitrate in the four water should be controlled at about 4%.
【作者單位】： 后勤工程學(xué)院化學(xué)與材料工程系;
【分類號】：TQ172.1

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