Influence of High Temperatures on the Workability of Fresh Ready Influence of High Temperatures on the Workability of Fresh Ready-Mixed Concrete Influence of High Temperatures on the Workability of  

Oleh:

Sampebulu, Victor

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Journal of Engineering and Technological Sciences vol. 44 no. 01 (2012), page 021-032.
Topik: ambient temperature concrete; slump loss. ambient temperature; formula; fresh concrete temperature; ready ready-mixed
Fulltext: 157-310-1-SM.pdf (596.89KB)

Isi artikel

Abstract. Properties of fresh concrete made in tropical countries, which is mixed, transported (with agitation), placed and initially cured in places where the temperature ranges from about 20 are not completely understood. Applicable requirements also differ from country to country and government agencies and private enterprises have their own specifications. Assuming such tempera present study is an attempt at evaluating the properties of hot weather concrete in fresh state with using a method of ready mixed and agitated at varying concrete and ambien of the component materials, each material having such temperature as to bring resulting temperature of the fresh concrete to about 20 chosen. The temperature of cement was conditioned to about20 for each of groups respectively. The aggregate was made warm enough to simulate the condition of outdoor pile in ready temperature of tap water was always 20 unlikely affected by outdoor temperature. With the fresh concrete prevented from evaporation, slump loss concrete. During agitation, the slump loss increases rapidly during the first 30 minutes but moderately during the remaining period. Concrete temperature (upon arrival at the work site) could be estimated by a proposed formula derived from this study. Besides the freshly mixed concrete temperature, this formula also takes in transit and hydration heat. The achievement as described in this study may be useful to control concrete quality in terms of strength, shrinkage and other properties of concrete to be placed in hot Properties of fresh concrete made in tropical countries, which is mixed, transported (with agitation), placed and initially cured in places where the ranges from about 20 o C to 40 o C and relative humidity above 60%, are not completely understood. Applicable requirements also differ from country to country and government agencies and private enterprises have their own specifications. Assuming such temperature and relative humidity conditions, the present study is an attempt at evaluating the properties of hot weather concrete in fresh state with using a method of ready–mixed concrete. The fresh concrete was mixed and agitated at varying concrete and ambient temperatures. Three groups of the component materials, each material having such temperature as to bring resulting temperature of the fresh concrete to about 20 o C, 30 o C, were chosen. The temperature of cement was conditioned to about20 o C, 35 , 40 C and 6 for each of groups respectively. The aggregate was made warm enough to simulate the condition of outdoor pile in ready-mixed concrete plant. The temperature of tap water was always 20 o C as it was easily controlled and ely affected by outdoor temperature. With the fresh concrete prevented from evaporation, slump loss is caused solely by increased temperature of concrete. During agitation, the slump loss increases rapidly during the first 30 moderately during the remaining period. Concrete-placing temperature (upon arrival at the work site) could be estimated by a proposed derived from this study. Besides the freshly mixed concrete temperature, this formula also takes into consideration the ambient temperature, agitating time in transit and hydration heat. The achievement as described in this study may be useful to control concrete quality in terms of strength, shrinkage and other of concrete to be placed in hot-humid environment. Properties of fresh concrete made in tropical countries, which is mixed, transported (with agitation), placed and initially cured in places where the C and relative humidity above 60%, are not completely understood. Applicable requirements also differ from country to country and government agencies and private enterprises have their own ture and relative humidity conditions, the present study is an attempt at evaluating the properties of hot weather concrete in mixed concrete. The fresh concrete was t temperatures. Three groups of the component materials, each material having such temperature as to bring C for each of groups respectively. The aggregate was made warm enough to o o C, were C and 60 plant. The C as it was easily controlled and ely affected by outdoor temperature. With the fresh concrete prevented is caused solely by increased temperature of concrete. During agitation, the slump loss increases rapidly during the first 30 placing temperature (upon arrival at the work site) could be estimated by a proposed derived from this study. Besides the freshly mixed concrete temperature, , agitating time in transit and hydration heat. The achievement as described in this study may be useful to control concrete quality in terms of strength, shrinkage and other properties of concerete to be placeed in hot-humid environment

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