【作者】 王振军；

【导师】 何廷树；

【作者基本信息】 西安建筑科技大学 ， 材料学， 2004， 硕士

【摘要】 自密实轻骨料高性能混凝土(SCLC)是在普通自密实混凝土的基础上，用轻骨料代替普通骨料，采用一定配合比技术配制而成的一种干表观密度小于1950kg／m~3的新型高性能混凝土。 本文对SCLC所用轻骨料主要技术指标进行了检验。介绍了轻骨料混凝土的主要特性。参考自密实混凝土和轻骨料混凝土配合比设计原理，采用绝对体积法，成功研制出强度等级为LC30～LC50自密实轻骨料高性能混凝土。采用改进L-800流动仪，研究了影响LC40自密实轻骨料高性能混凝土工作性的主要因素，结果表明：粉煤灰掺量保持30％左右，硅灰掺量为2％～6％，体积砂率为50％左右和掺加具有粘塑组分的复合高效减水剂是保证SCLC拌合物具有较好工作性的关键。采用拌合物分层测定仪，对拌合物分层现象进行了研究，提出掺入具有粘塑组分的复合高效减水剂是防止分层的主要措施。研究了SCLC力学和耐久性能，并与普通混凝土进行了比较。结合SCLC工作性和力学性能，指出表面粗糙、圆球形轻骨料更易满足SCLC性能要求。更多还原

【Abstract】 Self-compacting light aggregate high performance concrete (abbreviated SCLC ) is a new type of HPC with the dry apparent density of less than 1950 kg/m3,which can be made by replacing ordinary aggregete with light aggregate and adopting a new design of concrete mix on the basis of ordinary self-compacting concrete.In the paper, the main technical indexes of light aggregate used in SCLC were tested and the main characteristics of light aggregate concrete were introduced. Based on the principles of designs of self-compacting and light aggregate concrete mix, SCLC of LC30-LC50 was developed by using absolute volume method. The main factors affecting the workability of SCLC were studied by adopting the modified L-800 fluidity instrument. The results indicate that the key techniques insuring good workability of SCLC are about 30% first-grade fly ash, about 50% volume sand ratio, 2%~6% dosages of silicon fume and compounded superplasticicizers with viscous ingredient. The delamination phenomenon of mixture was studied by adopting the mixture delamination instrument. It is suggested that adding compounded superplasticicizers with viscous ingredient is the main measure preventing mixture from delamination. Mechanical properties and durability of SCLC were studied and contrasted to ordinary concrete. Combining with workability and mechanical properties of SCLC, it is pointed out that light aggregate with coarse surface and rotund shape satisfies the needs of SCLC performance more easily.更多还原