Preceding material for pumping

Abstract

The purpose of the present invention is to provide a preceding material for pumping, a feeding of a very small amount thereof being capable of extending the pumping distance. The preceding material for pumping includes an added cellulose nanofiber and having calcium carbonate as a main component. The present invention enables a thin lubricant layer of a uniform thickness to be formed inside a pipe even when the pipe has a slightly roughened inner surface due to, for example, residues of solidified cement paste or the like, allowing the pumping distance to be extended. Thus, the present invention is suitable, for example, for casting ready-mixed concrete at various construction sites.

1 . A preceding material for pumping, characterized by comprising an added cellulose fiber, and having calcium carbonate as a main component. 
     
     
         2 . The preceding material for pumping as claimed in  claim 1 , wherein,
 a part or the whole of the calcium carbonate is calcium carbonate recovered from sludge of ready-mixed concrete.   
     
     
         3 . The preceding material for pumping as claimed in  claim 1 , wherein,
 the added volume of cellulose nanofiber is 0.005 weight percent or more.   
     
     
         4 . The preceding material for pumping as claimed in  claim 1 , wherein,
 paper sludge is added to the preceding material for pumping.   
     
     
         5 . The preceding material for pumping as claimed in  claim 1 , wherein,
 erythorobic acid is added to the preceding material for pumping.   
     
     
         6 . The preceding material for pumping as claimed in  claim 1 , wherein,
 color pigment is added to the preceding material for pumping.