Experimental Study on Cement Admixed with Volcanic Ash

[摘要] Thirty percent cement is respectively replaced by equal quantity red volcanic ash and gray one which are from Yunnan province . Under the same diffusance, the mortal test block of cement, cement-gray volcanic ash, and cement-red one were produced, respectively. Meanwhile the mortar mechanical properties of volcanic ash admixture and non-admixture were compared. The results show that adding these two kind of volcanic ashes into cement will reduce the strength of cement mortar system to some extent. On the basis of this, the micro-analysis of the three mortal systems is performed. The results indicate the strength decrease of cement mortal system is caused by decrease of hydrated calcium silicate crystal which are produced through hydration reaction, and decrease of crystal space structure due to adding volcanic ash.

[发布机构] Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an, Shaanxi; 710123, China^1;School of Civil Engineering Wuhan University, Wuhan, Hubei; 430000, China^2

[效力级别] 无线电电子学

[关键词] Cement mortars;Hydrated calcium silicates;Hydration reaction;Space structure;Volcanic ash;Yunnan province