水泥-水玻璃浆液凝固特性试验研究

水泥-水玻璃浆液在灌浆、堵水等工程中具有广泛的应用，而浆液的凝固特性对灌浆、堵水效果具有直接的影响。在对水泥-水玻璃浆液凝结硬化机理分析的基础上，对不同水灰比浆液的胶凝时间和流动度进行了试验研究，并对FDN、SM、NF、UNF-5、柠檬酸、多聚磷酸钠、酒石酸钾钠、酒石酸、磷酸氢二钠等外加剂对浆液凝固特性的影响进行了对比试验研究。在此基础上重点对磷酸氢二钠的缓凝性能进行了试验分析，初步获得了磷酸氢二钠对水泥-水玻璃浆液的凝固性能的影响规律。最后按初凝时间设计了几种水泥-水玻璃浆液的配方。

Experimental Study on Solidified Characters of Cement-sodium Silicate Slurry

The cement-sodium silicate slurry is widely used in grouting and water stopping, and the solidification characteristics of slurry have the direct effect on such engineering. The gelation time and fluidity of the slurry with different water/cement ratio have been studied on the theoretical basis of setting and hardening of cement-sodium silicate slurry. Contrast tests have been done to research the influence of admixtures to the solidification characteristics of slurry such as FDN, SM, NF, UNF-5, citric acid, polyphosphate, tartaric acid and disodium hydrogen phosphate. The retarding performance of disodium hydrogen phosphate is specially studied by means of the data of contrast tests, and the influence law of the disodium hydrogen phosphate to the solidification characteristis of cement-sodium silicate slurry has been got. The different formulas of cement-sodium silicate slurry are designed according to the initial setting time.