1994 Volume 5 Issue 2 Pages 33-47
In regard to low-Heat and high flowable concrete for underground diaphragm walls using low-Heat cement and high range water reducing and AE agent, the effects of kinds of binders or water reducing and AE agent on the properties of the concrete were examined. The effects of factors for mixture and manufacturing of concrete or of pumping on properties of the concrete were also appreciated. Based on these experiments, it was clarified that the concrete, utilized high range water reducing and AE agent of polycarboxylic acid system, has faster velocity of deformation than that of β-naphthalene sulfonic acid system and the setting time and the loss time of flowability after sufficient retention time of flowability were also faster than that one. The retention time of flowability could be controled by the quantity of cross-linking polymer in high range water reducing and AE agent. The viscosity of that concrete become inferior due to pumping. The reason of loss of slumpflow was considered that the quantity of high range water reducing and AE agent in the concrete was decreased because of adsorption of the agent to the surface of cement particles which were came from shear deformations by pumping.
