【摘要】：在低水泥澆注料中添加適量減水劑可有效改善其使用性能。目前研究使用較多的是各種聚磷酸鹽類減水劑,而在硅酸鹽水泥混凝土中廣泛使用的萘系、氨基磺酸鹽系和聚羧酸鹽系減水劑對低水泥澆注料性能影響的差異性研究尚少,論文系統(tǒng)地對比研究了三聚磷酸鈉、六偏磷酸鈉、萘系、氨基磺酸鹽系、聚羧酸系等減水劑對澆注料流變性能、物理性能、高溫性能的影響規(guī)律及其機(jī)理。主要研究成果如下:(1)摻入聚羧酸減水劑的基質(zhì)漿體的ζ-電位絕對值僅為20-30mV,靜電斥力小,以空間位阻斥力為主,漿體呈良好的塑性、假塑性、膨脹性流體狀態(tài);摻入聚磷酸鹽減水劑可使基質(zhì)漿體形成較厚的擴(kuò)散雙電層,ζ-電位絕對值高,可達(dá)到70-100mV,以靜電斥力為主,漿體呈良好塑性流體狀態(tài);摻入萘系、氨基磺酸鹽系減水劑的基質(zhì)漿體的ζ-電位絕對值為30-60mV,靜電斥力和空間位阻斥力相對較弱,需增大摻量漿體才能達(dá)到較好流動(dòng)狀態(tài)。(2)摻入聚羧酸減水劑的基質(zhì)漿體的表觀黏度低,漿體的流動(dòng)性好,摻量為0.10%~0.12%時(shí),可使?jié)沧⒘习韬衔锏挠盟康?工作性好,對基質(zhì)漿體的流動(dòng)性和拌合物的工作性的影響一致;摻入聚磷酸鹽減水劑的基質(zhì)漿體的表觀黏度高,漿體的流動(dòng)性好,摻量為0.15%時(shí)可使?jié)沧⒘习韬衔锏挠盟枯^低,工作性較好,對基質(zhì)漿體的流動(dòng)性和拌合物的工作性的影響一致;摻入氨基磺酸鹽系與萘系減水劑的基質(zhì)漿體的表觀黏度較高,漿體的流動(dòng)性較好,摻量分別達(dá)到0.18%和0.75%時(shí),澆注料拌合物的用水量高,工作性差,對基質(zhì)漿體的流動(dòng)性和拌合物的工作性的影響不一致。(3)摻入0.10%~0.12%聚羧酸系減水劑的澆注料用水量為5.4%~5.8%,硬化后澆注料的體積密度、常溫抗壓和抗折強(qiáng)度高;摻入0.15%聚磷酸鹽減水劑的澆注料用水量為5.6%,硬化后澆注料的體積密度、常溫抗壓和抗折強(qiáng)度略低于摻聚羧酸系減水劑的;分別摻0.18%和0.75%氨基磺酸鹽系、萘系減水劑的澆注料用水量高達(dá)6.3%和6.5%,硬化后澆注料的體積密度、常溫抗壓和抗折強(qiáng)度低。(4)摻入聚羧酸系減水劑的澆注料的燒后線變化率低,其次是摻入三聚磷酸鈉、六偏磷酸鈉的較低,摻氨基磺酸鹽系、萘系減水劑的澆注料的高。(5)摻入聚磷酸鹽減水劑的澆注料的孔徑分布有一個(gè)強(qiáng)峰和次強(qiáng)峰,平均孔徑較小,孔徑分布不很均勻,但仍可在一定程度上改善澆注料的熱震穩(wěn)定性;摻入聚羧酸系減水劑的澆注料的孔徑分布曲線只有一個(gè)強(qiáng)峰,孔徑分布均勻,熱震穩(wěn)定性較摻入聚磷酸鹽減水劑的提高10%以上;摻入氨基磺酸鹽系、萘系減水劑的澆注料的平均孔徑大,孔隙率高,熱震穩(wěn)定性差。(6)SEM顯微結(jié)構(gòu)分析表明:經(jīng)過110℃×24h烘干后,摻三聚磷酸鈉減水劑的澆注料試樣分布有較大的球形顆粒,有少量絮凝結(jié)構(gòu),摻聚羧酸減水劑KS-JS70的澆注料試樣的顆粒更細(xì)小、分散更好,說明KS-JS70具有更好的分散效果;經(jīng)過1000℃×3h處理后,澆注料試樣結(jié)構(gòu)中形成大量孔隙,晶體逐漸形成針狀、片狀結(jié)構(gòu);經(jīng)過1400℃×3h處理后,澆注料充分燒結(jié)反應(yīng),生成二鋁酸鈣(CA2)、莫來石(A3S2)、鈣長石(CAS2)物相,改善了體積密度和常溫抗壓強(qiáng)度。
[Abstract]:And a proper amount of water reducing agent can be added to the low-cement pouring material to effectively improve the service performance. In the present study, many kinds of water-reducing agents of polyphosphates are used, and the differential research on the influence of the water-reducing agent, the sulfamate system and the polyacrylate-based water-reducing agent used widely in the silicate cement concrete has little influence on the performance of the low-cement pouring material. The influence of water-reducing agent such as sodium tripolyphosphate, sodium hexametaphosphate, sodium hexametaphosphate, sulfamate system and polyfluoroacid series on the rheological properties, physical properties and high-temperature properties of the castable was studied systematically. The main research results are as follows: (1) The absolute value of the initial-potential of the matrix slurry incorporated into the polyglycolic acid water-reducing agent is only 20-30mV, the electrostatic repulsive force is small, the space steric repulsion is the main, the slurry is in good plasticity, pseudoplastic and expansive fluid state; the mixed phosphate water reducing agent can make the substrate slurry form a thick diffusion electric double layer, the absolute value of the ferroelectricity-potential is high, can reach 70-100mV, the static repulsion is the main, the slurry is in a good plastic fluid state, The electrostatic repulsive force and the steric hindrance repulsion force are relatively weak, and the mixing amount of the slurry needs to be increased to achieve a better flow state. (2) the apparent viscosity of the matrix slurry doped with the polyglycolic acid water reducing agent is low, the fluidity of the slurry is good, the mixing amount is between 0.10 and 0.12 percent, the water consumption of the pouring material mixture is low, the working property is good, and the fluidity of the matrix slurry and the working property of the mixture are consistent; the apparent viscosity of the matrix slurry doped with the polyphosphate water reducing agent is high, the fluidity of the slurry is good, the water consumption of the pouring material mixture can be lower when the content is 0.15%, the working performance is good, and the fluidity of the matrix slurry and the working property of the mixture are consistent; The apparent viscosity of the matrix slurry doped with the sulfamate system and the water-reducing agent is high, the fluidity of the slurry is good, the mixing amount of the slurry is 0.18% and 0.75%, the water consumption of the pouring material mixture is high, the workability is poor, and the fluidity of the matrix slurry and the working property of the mixture are not consistent. (3) the water consumption of the casting material with the addition of 0.10 to 0.12 percent of the polyacrylate water reducing agent is 5.4 to 5.8 percent, the volume density of the hardened pouring material is high, the normal temperature and the bending strength are high, the water consumption of the casting material doped with the 0.15 percent of the polyphosphate water reducing agent is 5.6 percent, and the volume density of the hardened pouring material is high, The compressive and flexural strength at room temperature is slightly lower than that of the water-reducing agent of the polyglycolic acid, and the water consumption of the castable is as high as 6.3% and 6.5%, respectively, and the volume density, the normal temperature and the breaking strength of the casting material after the hardening are low. And (4) the rate of change of the post-firing line of the casting material doped with the polyglycolic acid-based water reducing agent is low, followed by the addition of the lower of the sodium tripolyphosphate and the sodium hexametaphosphate, the sulfamate system and the high-grade water-reducing agent of the water-reducing agent. (5) the pore size distribution of the casting material doped with the polyphosphate water reducing agent has a strong peak and a secondary strong peak, the average pore diameter is small, and the pore size distribution is not uniform, but the thermal shock stability of the casting material can be improved to a certain extent; The pore size distribution curve of the casting material doped with the polyacrylate water reducing agent has only one strong peak, the pore size distribution is uniform, the thermal shock stability is higher than that of the polyphosphoric acid water reducing agent by more than 10 percent, the average pore diameter of the casting material doped with the sulfamate system and the water reducing agent is large, the porosity is high, And the thermal shock stability is poor. (6) SEM microstructural analysis shows that after drying at 110 鈩，

本文編號：2484558