Study on the preparation and properties of high-strength concrete from tuffs
To achieve efficient utilization of resources in the Kenyan region,volcanic ash from the Athi River area,rich in tuff,is used as a mineral admixture to prepare high-strength concrete.This study investigates the effects of the amount of tuff admixture and curing regimes on the properties of concrete mixtures,mechanical properties,chloride ion penetration resistance,and carbonation resistance.The results show that as the amount of tuff admixture increases,both the bulking factor and air content of the concrete mixture first increase and then decrease.The incorporation of tuff leads to a reduction in the compressive strength of the concrete,but different curing methods exhibit varying degrees of strengthening effect.Steam curing enhances the early strength of the concrete through the pozzolanic effect,while standard curing optimizes the internal pore structure to improve the later strength of the concrete.When the tuff admixture is 10％,the chloride ion diffusion coefficient of the concrete is at its minimum.It is recommended to use standard curing when the tuff admixture is between 5％and 10％,and steam curing when the tuff admixture is between 15％and 25％.The carbonation resistance of the concrete is significantly affected by the curing conditions,steam curing can effectively resist carbonation erosion.
high strength concretetuffmixing propertiesmechanical propertydurability properties
万方数据
维普
