The Design And Study On Modified Quicklime Stabilized Road Base Material

The low early-strength and complex construction of the lime stabilized soil and the lime fly ash stabilized soil are key problems affecting the quality of road construction in our country. Utilizing the principle of double agitation(alkali and sulfate) pozzolanic activity, quicklime is modified by adding phosphorus gypsum. Modified quicklime is explored firstly, then modified quicklime stabilized soil, crushed stone, phosphorous slag, phosphorous slag- crushed stone composite are involved in this thesis. Mix proportioning and property optimization of the four syetems are studied in order to provide theroy gist for popularization and application of modified quicklime stabilized road base materials.The preparation process of modified quicklime are studied. The advantage of process is that milling cost reduces, the fine of phosphorus gypsum increases, construction is simplified, environment waste falls.Mix proportioning of modified quicklime stabilized soil, crushed stone, phosphorous slag, phosphorous slag- crushed stone composite are studied. Optimum mix of every system are put forward. Constrasting quicklime stabilized material, modified quicklime stabilized material have higher early strength in the same lime content. Modified quicklime stabilized material have better anti-water attack, strength development and other mechanical property. Those prove that modified quicklime can replace lime in the roadbase.Strength formation mechanism of modified quicklime stabilized phosphorous slag are studied. The strength of modified quicklime stabilized phosphorous slag originate in gelatinization in lime, fly ash, phosphorus gypsum and active aggregate interface intensified effect due to pozzolanic reaction.