The construction of beautiful and livable villages is one of the important tasks of ruralrevitalization in the new era, and the development of rural areas attaches more and more importanceto the improvement of human s...The construction of beautiful and livable villages is one of the important tasks of ruralrevitalization in the new era, and the development of rural areas attaches more and more importanceto the improvement of human settlement environment. By investigating the construction status andexisting problems of Zhaoba Village in Nanjing, it tries to take “beauty” and “livability” as the planningrequirements. The village positioning is planned accurately, and the functional layout is carried outreasonably. According to the characteristic industries, landscape features and infrastructure of ZhaobaVillage, humanized construction strategies are put forward, thus improving the quality of human settlementenvironment in Zhaoba Village.展开更多
Two kinds of pure calcium aluminate cement(CAC)prepared by the sintering method and the electric melting method,respectively were analyzed in terms of the particle size,XRD patterns and hydration characteristics;and t...Two kinds of pure calcium aluminate cement(CAC)prepared by the sintering method and the electric melting method,respectively were analyzed in terms of the particle size,XRD patterns and hydration characteristics;and their effects on the hydration heat and construction performance of the cement-based castables were discussed.It is found that(1)the electric fused CAC contains 50.67%CA and 44.89%CA_(2),while the sintered CAC contains 74.57%CA and 22.97%CA_(2);in addition,compared to the sintered CAC,the electric fused CAC contains more C_(3)A,C_(12)A_7,and a small amount of amorphous phase;(2)the electric fused CAC(d_(50)of 7.93μm)has much smaller particle size than the sintered CAC(d_(50)of 12.51μm);(3)in the early stage of hydration,the exothermic peak of the electric fused CAC appears earlier and the heat flow rate is higher than that of the sintered CAC;the dormant period of the sintered CAC is relatively short and the main exothermic peak appears earlier than that of the electric fused CAC;(4)for cement-based castables,there is no obvious exothermic peak in the early hydration stage,but the temperature of the castables slightly increases;among them,the initial hydration temperature of the electric fused CAC-based castable is higher;and the main exothermic peak of the sintered CAC-based castable appears later than that of the electric fused CAC-based castable;(5)the exothermic heating on-site occurrs earlier,which is related to the higher environmental temperature(about 30℃);the on-site electric fused CAC-based castable begins to show more cracks during the exothermic peak stage.展开更多
文摘The construction of beautiful and livable villages is one of the important tasks of ruralrevitalization in the new era, and the development of rural areas attaches more and more importanceto the improvement of human settlement environment. By investigating the construction status andexisting problems of Zhaoba Village in Nanjing, it tries to take “beauty” and “livability” as the planningrequirements. The village positioning is planned accurately, and the functional layout is carried outreasonably. According to the characteristic industries, landscape features and infrastructure of ZhaobaVillage, humanized construction strategies are put forward, thus improving the quality of human settlementenvironment in Zhaoba Village.
文摘Two kinds of pure calcium aluminate cement(CAC)prepared by the sintering method and the electric melting method,respectively were analyzed in terms of the particle size,XRD patterns and hydration characteristics;and their effects on the hydration heat and construction performance of the cement-based castables were discussed.It is found that(1)the electric fused CAC contains 50.67%CA and 44.89%CA_(2),while the sintered CAC contains 74.57%CA and 22.97%CA_(2);in addition,compared to the sintered CAC,the electric fused CAC contains more C_(3)A,C_(12)A_7,and a small amount of amorphous phase;(2)the electric fused CAC(d_(50)of 7.93μm)has much smaller particle size than the sintered CAC(d_(50)of 12.51μm);(3)in the early stage of hydration,the exothermic peak of the electric fused CAC appears earlier and the heat flow rate is higher than that of the sintered CAC;the dormant period of the sintered CAC is relatively short and the main exothermic peak appears earlier than that of the electric fused CAC;(4)for cement-based castables,there is no obvious exothermic peak in the early hydration stage,but the temperature of the castables slightly increases;among them,the initial hydration temperature of the electric fused CAC-based castable is higher;and the main exothermic peak of the sintered CAC-based castable appears later than that of the electric fused CAC-based castable;(5)the exothermic heating on-site occurrs earlier,which is related to the higher environmental temperature(about 30℃);the on-site electric fused CAC-based castable begins to show more cracks during the exothermic peak stage.
