Self-Compacting Concrete Optimal Mix Design And Quality Control

Harden SCC has good mechanical property and durability, less construction noise and faster construction velocity.What's more,it can fill up the moulding board and hold reinforced bar under its own weight without vibration.With good liquidity,good construction and stuffing property.In addition, it is not easy for SCC to produce segregation with additives.In this thesis, local materials and industrial byproduct fly ash are used to produce the SCC.Using assessment indicators of the slump of fresh concrete,expand degree,the difference between the middle and edge, with the large number of experiments, a conclusion, which is that influence degree of fly ash dosage,mortar ratio, superplasticizers dosage and thickening agent dosage to fresh concrete workability and strength, is made through using Single-factor experiment method and regarding slump, expand degree, the difference between the middle and edge, as feedback indexs. At last, according to synthesis balance, and making analysis to experimental results, the author successfully obtained SCC with high liquidity, no vibration, which has the characters of slump, expand degree, the difference between the middle and edge. At the same time testing the compressive strength of self-compacting concrete, steel bond strength, resistance to charring performance, verify the hardened self-compacting concrete full compliance with requirements of the mechanical properties and high durability. Finally, the quality control of self-compacting concrete are studied.Combining expermental results and characteristics of engineering in practice,graded 30Mpa self-compacting concrete was chosen to reinforce the Baoding Normal School teaching building in the end. After testing, the concrete casting quality intact, floor, wall, beam,column, the strength, stiffness are to meet the design requirements. Self-compacting concrete in the successful application of this project show that self-compacting concrete reinforcement of existing buildings has significant technical and economic effects and social benefits.