Plant aggregate-based building materials are a viable solution for reducing greenhouse gas emissions and providing good thermal and acoustic performances.In this study,the investigated lightweight mortars require a hy...Plant aggregate-based building materials are a viable solution for reducing greenhouse gas emissions and providing good thermal and acoustic performances.In this study,the investigated lightweight mortars require a hydraulic reaction.Laboratory and on-site empirical observations about plant aggregate-based materials indicate a delay in setting time and a decrease in the mechanical performances of concretes based on plant aggregates.The natural origin of plant-aggregates causes a lot of variability in their properties.Related studies have shown that the incompatibility between plant aggregates and cement is mainly caused by the dissolved and decomposed components of plant aggregates in alkaline environments.Currently,no research on the specific impact of each component on the setting time of lime-based binder exists.In this work,the impact of some soluble compounds(e.g.,sucrose,glucose,fructose,pectin)on the setting reaction of the lime matrix was studied using Vicat test,thermogravimetric analysis(TGA)and FT-IR spectroscopy.Experimental results showed that carbohydrates such as glucose and sucrose not only affect the setting time but also have a long-term impact on the carbonation of lime.The measure of the setting time by Vicat test appears as a possible indicator to predict the compatibility between the matrix and plant aggregates.展开更多
The experiments were carried out at 1 175-1 450 ℃ to study the phosphorus distribution ratio between molten Ca O-based slags and carbon saturated hot metal. The phosphate capacity of the slags and the activity coeffi...The experiments were carried out at 1 175-1 450 ℃ to study the phosphorus distribution ratio between molten Ca O-based slags and carbon saturated hot metal. The phosphate capacity of the slags and the activity coefficient of PO2. 5were calculated from the phosphorus distribution ratio. The effect of addition of Ca F2 and / or Ca Cl2 on the thermodynamic properties of slags was discussed. The correlation of optical basicity with phosphate capacity of slags was studied,and the dephosphorization ability of Ca O-based fluxes with various additives was compared with the results from different studies.展开更多
文摘Plant aggregate-based building materials are a viable solution for reducing greenhouse gas emissions and providing good thermal and acoustic performances.In this study,the investigated lightweight mortars require a hydraulic reaction.Laboratory and on-site empirical observations about plant aggregate-based materials indicate a delay in setting time and a decrease in the mechanical performances of concretes based on plant aggregates.The natural origin of plant-aggregates causes a lot of variability in their properties.Related studies have shown that the incompatibility between plant aggregates and cement is mainly caused by the dissolved and decomposed components of plant aggregates in alkaline environments.Currently,no research on the specific impact of each component on the setting time of lime-based binder exists.In this work,the impact of some soluble compounds(e.g.,sucrose,glucose,fructose,pectin)on the setting reaction of the lime matrix was studied using Vicat test,thermogravimetric analysis(TGA)and FT-IR spectroscopy.Experimental results showed that carbohydrates such as glucose and sucrose not only affect the setting time but also have a long-term impact on the carbonation of lime.The measure of the setting time by Vicat test appears as a possible indicator to predict the compatibility between the matrix and plant aggregates.
文摘The experiments were carried out at 1 175-1 450 ℃ to study the phosphorus distribution ratio between molten Ca O-based slags and carbon saturated hot metal. The phosphate capacity of the slags and the activity coefficient of PO2. 5were calculated from the phosphorus distribution ratio. The effect of addition of Ca F2 and / or Ca Cl2 on the thermodynamic properties of slags was discussed. The correlation of optical basicity with phosphate capacity of slags was studied,and the dephosphorization ability of Ca O-based fluxes with various additives was compared with the results from different studies.
