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碱渣与粉煤灰固体拌合制成工程土可用作道路基础或大面积填垫材料,通过原位试验将碱渣与粉煤灰液相混合后进行吹填。研究表明,碱渣与粉煤灰固体含量最优配比为7∶3,此时碱渣土最优含水量与最大干密度分别为63.5%和0.88g/cm~3,渗透性较低,养护7d后无侧限抗压强度约为纯碱渣的6.5倍。现场液相吹填的碱渣土混合较好,沉淀层厚度约为80cm。经5个月自然晾晒后,碱渣土含水量介于160%~180%,深度方向轻型动力触探击数介于1~5,具有一定强度。相比固体拌合碱渣土,液相吹填碱渣土工艺简单,能够大批量、低成本利用碱渣,后期强度可通过真空预压等排水固结措施满足工程需要。
The engineering soil can be used as road foundation or large area padding material by mixing alkali sludge and fly ash solid, and the caustic residue and fly ash liquid phase can be mixed and filled by the in-situ test. The results show that the optimum ratio of solid content of alkali residue and fly ash is 7: 3, the optimal water content and maximum dry density of alkali - slag are 63.5% and 0.88 g / cm ~ 3 respectively, the permeability is low, After curing 7d unconfined compressive strength of about 6.5 times the soda ash residue. On-site liquid-filled alkaline dregs mixed well, the thickness of the sediment layer is about 80cm. After 5 months of natural drying, the alkali residue of soil moisture content of 160% to 180%, the depth direction of the light power of the number of hits between 1 to 5, with a certain intensity. Compared with the solid mixing of alkali and sludges, the liquid-blown caustic sludge is simple in technology and can utilize alkali sludges in large quantities and at low cost. The post-strength can meet the project requirements through the consolidation measures such as vacuum preloading.