High Temperature Hydration of Low Density Cement Slurries Weighted with Hollow Microspheres
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摘要: 空心微珠主要是硼硅酸盐玻璃材质制成，内部富含SiO2组分，在120 ℃、150 ℃下，对不同龄期微珠低密度水泥浆抗压强度、渗透率、微观分析、稠化可调性进行了测试，确认了空心微珠对高温水化特性的影响。研究结果表明，120、150 ℃下，空心微珠中的硅质组分均参与了水泥水化，对水泥石强度起到了抑制或补偿抑制作用，其中120 ℃时仅16%空心微珠可以在28 d之内起到抑制抗压强度衰退作用，150 ℃时抑制衰退则需要内掺一定的硅粉，确保硅粉含量与空心微珠含量之和达到40%以上；高温下微珠因参与反应表面形成显著的孔隙轮廓，随着养护龄期延长，水泥石总孔隙增多，无硅粉配方增加的孔径以50～100 nm的毛细孔居多，渗透率随着养护龄期的延长逐步增大，由最初的0.003 mD增加至0.011 mD，增幅较为明显，但渗透率净值并不大；内掺硅粉增加的孔径以小于50 nm的凝胶孔居多，渗透率随养护龄期延长基本变化不大；在没有硅粉情况下，14 d时水泥石中Ca(OH)2相消失，与玻璃微珠反应生成C—S—H凝胶，添加硅粉配方水化产物中未见Ca(OH)2相，反应迅速，生成具有良好抗衰退作用的托博莫来石相，起到较好的防止衰退作用；稠化时间具有可调性，硅粉和空心微珠都不会对水泥浆高温早期水化规律性造成不良影响。Abstract: Hollow microspheres are made of borosilicate glass and contain in their molecules abundant SiO2. In laboratory experiment, several pieces of set cement of low density cement slurries containing hollow microspheres are tested at 120 ℃ and 150 ℃ respectively for their properties such as compressive strength, permeability, microstructure and adjustability of thickening process, confirming the effects of hollow microspheres on the high temperature hydration characteristics of cement slurries. Laboratory study shows that at both 120 ℃ and 150 ℃, the siliceous components of the hollow microspheres participate in the hydration process of the cement, thereby inhibiting or compensatory inhibiting the strength of the set cement. At 120 ℃ only 16% hollow microspheres can in 28 d inhibit the decay of the compressive strength. At 150 ℃, silica fume and hollow microspheres have to be used together, with both amounted in the cement to at least 40%, to inhibit the decay of the compressive strength of the set cement. At elevated temperatures, hollow microspheres’ reaction with other components in the cement slurry results in the formation of significant pore contours on the surfaces of the hollow microspheres. With the extension of aging time, the total porosity of the set cement increases. The pores increased in the set cement from the cement slurry without silica fume are mainly capillary pores with diameters in the range of 50-100 nm, the permeability of the set cement increases significantly with aging time from the initial 0.003 mD to 0.011 mD, while the net increment of the permeability is not relatively small. On the other hand, the pores increased in the set cement from the cement slurry treated with silica fume are mainly gel pores with diameters less than 50 nm, and the permeability of the set cement basically does not change greatly with aging time. In the set cement without the treatment of silica fume, the Ca(OH)2 diminishes in 14 d, reacting with the glass microspheres to produce C–S–H gels. In the hydration products of the cement slurry treated with silica fume, no Ca(OH)2 is found and the reaction proceeds swiftly to form tobermorite phase with good ability to resist strength decay. The thickening time of the hollow microsphere weighted low density cement slurries is adjustable, and the silica fume and the hollow microsphere do not negatively affect the early-stage hydration process of the cement slurries at high temperatures.
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Key words:
- Microsphere /
- Silica fume /
- High temperature /
- Strength decay
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