泵送剂对膏体抗压强度的影响试验研究及机理分析

泵送剂能有效改善膏体料浆流动性能，然而其对膏体料浆凝结性能的影响机理尚未明确。针对这一问题，本文进行泵送剂的抗压强度试验和环境扫描电镜观察。强度试验结果表明：泵送剂可有效改善膏体料浆凝结性能，泵送剂掺量越高不同龄期的膏体凝结性越好。环境扫描电镜观察结果表明：泵送剂添加后，大尺寸絮团减少，料浆内孔隙减少，改变了膏体微观结构。基于应用计算机图像处理技术和分形理论，计算膏体微观结构计盒维数，量化分析膏体微观结构。最终对泵送剂改善膏体凝结性能的机理进行分析，认为泵送剂通过改变絮团大小和数量、孔隙率、水化反应等方面影响膏体凝结性能。

Experimental study and mechanism analysis on the effect of pumping agents on the compressive strength of paste slurries

Pumping agents can improve the fluidity of paste slurries. However, the effecting mechanism of pumping agents on the coagulability of paste slurries is not made clear. To solve this problem, a pumping agent was added for compression strength tests and environmental scanning electron microscopy ( ESEM) observations. Compression strength test results indicate that the pumping agent can improve the coagulability of paste slurries, and the more the pumping agent amount, the better the coagulability of paste slurries. ESEM observation results show that large size floccules and pores decrease after adding the pumping agent, and the paste’s microstruc-ture is changed. The fractal dimensions of the paste’s microstructure images were calculated based on the image processing technology and fractal theory, and the structure was quantitatively analyzed. The mechanism of improving the coagulability of paste slurries was discussed. It is found that the coagulability of paste slurries is affected by changing the size and number of flocculants, the porosity and the hydration reaction.