Experimental Study On The Masonry Structure Reinforcement Materials For Embedded Reinforcement

Inspired by the current a variety of method of reinforcing masonry structures andreinforced masonry, Civil engineering academy of sciences of Gansu proposed a newway of reinforcement masonry structures reinforcing bars embedded technology. Toachieve the way of reinforcement, it is closely connected with the excellent performanceof caulking cement. In order to improve the performance of caulking cement, this papermodified and explored the modified mechanism of caulking cement by differentcomponents of various mineral admixtures and polymer. And ultimately optimize thecomponents of the Caulking cement.The research based on single factor experiment to study the performance of theCaulking cement through single doped with fly ash, slag, silica fume. And determine theappropriate scope of single dosage. The result showed, mixed fly ash and slag couldimprove the performance of caulking cement without reducing the mechanicalproperties, and savings material cost. Silica fume can effectively improve theperformance of Caulking cement, but not using separately. On the basis of fixed silicafume dosage, the result of double mixing with fly ash and slag has been carried out. Itshowed that: Mixed with fly ash could effectively improve the constructionperformance of caulking cement; With20%fly ash and5%silica fume, all aspects ofcaulking cement index were balanced；Mixed with slag could effectively improve thecompressive strength, But the flexible of caulking cement were worse.Polymer could improve workability of caulking cement. Because of polymer meshmembrane, The specific content of polymer could improve the performance of caulking cement, but the large dosage of polymer powder on mixed caulking cement compressivestrength the loss was bigger. Cellulose ether has a significant role in water retention andair-entraining. Cellulose ethers with significant water retention and air-entraining effectcould significantly improve construction performance of caulking cement, but thecompressive strength loss is too large for caulking cement. Composite polymer powderand the cellulose ethers, not only improve the workability of the caulking mastic, butalso increased mechanical strength slightly, and improved caulking mastic crimpingratio.Considering various factors, caulking cement mixing ratio was determined asfollows:(cement+silica fume+fly ash+expanders): water: sand: water reducer:cellulose ether: Polymer=(0.70+0.2+0.05+0.05):0.27:1.5:0.01:0.0005:0.01. Referto some relevant standards this research tested the performance of caulking cement,Result showed that: the new formula of caulking cement possesses good workability,adhesion properties, micro-expansion and good resistance to freezing and thawing. Canbe applied to masonry structure reinforcement bars embedded technology.