不同种类减水剂对低水泥浇注料性能的影响研究
发布时间：2019-05-24 04:30
【摘要】：在低水泥浇注料中添加适量减水剂可有效改善其使用性能。目前研究使用较多的是各种聚磷酸盐类减水剂,而在硅酸盐水泥混凝土中广泛使用的萘系、氨基磺酸盐系和聚羧酸盐系减水剂对低水泥浇注料性能影响的差异性研究尚少,论文系统地对比研究了三聚磷酸钠、六偏磷酸钠、萘系、氨基磺酸盐系、聚羧酸系等减水剂对浇注料流变性能、物理性能、高温性能的影响规律及其机理。主要研究成果如下:(1)掺入聚羧酸减水剂的基质浆体的ζ-电位绝对值仅为20-30mV,静电斥力小,以空间位阻斥力为主,浆体呈良好的塑性、假塑性、膨胀性流体状态;掺入聚磷酸盐减水剂可使基质浆体形成较厚的扩散双电层,ζ-电位绝对值高,可达到70-100mV,以静电斥力为主,浆体呈良好塑性流体状态;掺入萘系、氨基磺酸盐系减水剂的基质浆体的ζ-电位绝对值为30-60mV,静电斥力和空间位阻斥力相对较弱,需增大掺量浆体才能达到较好流动状态。(2)掺入聚羧酸减水剂的基质浆体的表观黏度低,浆体的流动性好,掺量为0.10%~0.12%时,可使浇注料拌合物的用水量低,工作性好,对基质浆体的流动性和拌合物的工作性的影响一致;掺入聚磷酸盐减水剂的基质浆体的表观黏度高,浆体的流动性好,掺量为0.15%时可使浇注料拌合物的用水量较低,工作性较好,对基质浆体的流动性和拌合物的工作性的影响一致;掺入氨基磺酸盐系与萘系减水剂的基质浆体的表观黏度较高,浆体的流动性较好,掺量分别达到0.18%和0.75%时,浇注料拌合物的用水量高,工作性差,对基质浆体的流动性和拌合物的工作性的影响不一致。(3)掺入0.10%~0.12%聚羧酸系减水剂的浇注料用水量为5.4%~5.8%,硬化后浇注料的体积密度、常温抗压和抗折强度高;掺入0.15%聚磷酸盐减水剂的浇注料用水量为5.6%,硬化后浇注料的体积密度、常温抗压和抗折强度略低于掺聚羧酸系减水剂的;分别掺0.18%和0.75%氨基磺酸盐系、萘系减水剂的浇注料用水量高达6.3%和6.5%,硬化后浇注料的体积密度、常温抗压和抗折强度低。(4)掺入聚羧酸系减水剂的浇注料的烧后线变化率低,其次是掺入三聚磷酸钠、六偏磷酸钠的较低,掺氨基磺酸盐系、萘系减水剂的浇注料的高。(5)掺入聚磷酸盐减水剂的浇注料的孔径分布有一个强峰和次强峰,平均孔径较小,孔径分布不很均匀,但仍可在一定程度上改善浇注料的热震稳定性;掺入聚羧酸系减水剂的浇注料的孔径分布曲线只有一个强峰,孔径分布均匀,热震稳定性较掺入聚磷酸盐减水剂的提高10%以上;掺入氨基磺酸盐系、萘系减水剂的浇注料的平均孔径大,孔隙率高,热震稳定性差。(6)SEM显微结构分析表明:经过110℃×24h烘干后,掺三聚磷酸钠减水剂的浇注料试样分布有较大的球形颗粒,有少量絮凝结构,掺聚羧酸减水剂KS-JS70的浇注料试样的颗粒更细小、分散更好,说明KS-JS70具有更好的分散效果;经过1000℃×3h处理后,浇注料试样结构中形成大量孔隙,晶体逐渐形成针状、片状结构;经过1400℃×3h处理后,浇注料充分烧结反应,生成二铝酸钙(CA2)、莫来石(A3S2)、钙长石(CAS2)物相,改善了体积密度和常温抗压强度。
[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，
本文编号：2484558
[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，
本文编号：2484558
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