Effect of retempering with superplasticizer admixtures on slump loss and compressive strength of concrete subjected to prolonged mixing

被引:40
作者
Erdogdu, S [1 ]
机构
[1] Karadeniz Tech Univ, Dept Civil Engn, TR-61080 Trabzon, Turkey
关键词
workability; hydration products; strength; superplasticizer; retempering;
D O I
10.1016/j.cemconres.2004.08.020
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
To have concrete possesses the specified engineering properties, its slump loss has to be compensated somehow at construction site so that concrete could be placed and compacted properly. Several attempts have been tried so far to render concrete workable at construction site including starting with a high initial slump at the stationary plant, or retempering with water and/or with chemical admixtures at construction site. In this investigation, ASTM C 494 Type F superplasticizer was used for retempering concrete to restore its initial slump. Concrete mixes having an initial slump of about 19 cm were prepared and subjected to prolonged mixing with different mixing duration such as 30, 60, 90, 120, and 150 min following an initial mixing of 5 min to ensure homogeneity. At the end of each mixing period, cube specimens of 15 cm were cast from concrete retempered to its initial slump level and tested at the age of 28 days for compressive strength. Results revealed that compared to the concrete retempered with water, those retempered with a superplasticizer admixture have yielded significantly higher strength regardless of the mixing duration. (c) 2004 Published by Elsevier Ltd.
引用
收藏
页码:907 / 912
页数:6
相关论文
共 14 条
[1]   Concrete mixture design for hot weather: experimental and statistical analyses [J].
Al-Gahtani, HJ ;
Abbasi, AGF ;
Al-Amoudi, OSB .
MAGAZINE OF CONCRETE RESEARCH, 1998, 50 (02) :95-105
[2]  
[Anonymous], ACI J P
[3]   THE SUPERPLASTICIZER ADSORPTION CAPACITY OF CEMENT PASTES, PORE SOLUTION COMPOSITION, AND PARAMETERS AFFECTING FLOW LOSS [J].
BONEN, D ;
SARKAR, SL .
CEMENT AND CONCRETE RESEARCH, 1995, 25 (07) :1423-1434
[4]   Compatibility of superplasticizers with cements different in composition [J].
Erdogdu, S .
CEMENT AND CONCRETE RESEARCH, 2000, 30 (05) :767-773
[5]   Interaction between cement and chemical admixture from the point of cement hydration, absorption behaviour of admixture, and paste rheology [J].
Hanehara, S ;
Yamada, K .
CEMENT AND CONCRETE RESEARCH, 1999, 29 (08) :1159-1165
[6]   Effects of retempering on consistency and compressive strength of concrete subjected to prolonged mixing [J].
Kirca, Ö ;
Turanli, L ;
Erdogan, TY .
CEMENT AND CONCRETE RESEARCH, 2002, 32 (03) :441-445
[7]  
Meyer W.F., 1979, ACI CONCR INT, V1, P36
[8]  
PREVITE RW, 1977, ACI J P, V74, P361
[9]  
Ravina D, 1996, ACI MATER J, V93, P451
[10]  
RAVINA D, 1995, ACI CONCR INT, V17, P25