Application of Self-Compacting Concrete in Precast Structure Technology

[摘要] The present article contains research results on the influence of the water-cement ratio and the content of dolomite powder in blended cement; as well as the influence of the mortar excess ratio on the properties of the self-compacting concrete for the precast structure technology. Workability of concrete mix, strength and shrinkage of the concrete were examined. It was established that the content of dolomite powder and water-cement ratio produce an approximately equal impact on the strength of the self-compacting concrete. The workability of the self-compacting concrete mix at the consumption of the dolomite powder at the level of 30-40% depends only on the ratio of mortar excess in the concrete. Heat treatment of self-compacting concrete at the temperature of 50 °C over the period of 16-20 hours allows to achieve the concrete strength of 35 MPa. After the 24-hour exposure to room conditions, the strength of these concretes reaches 25-40 MPa. Concretes with the use of dolomite powder have a higher shrinkage at low dosages of superplasticizer.

[发布机构] Department of Technology of Building Materials and Wood Processing, Penza State University of Architecture and Construction, German Titov St., 28, Penza; 440028, Russia^1

[关键词] Blended cement;Concrete strength;Low dosage;Precast structure;Research results;Superplasticizers;Water-cement ratio