Method for making bughole-free hardened cement structural units using bughole-reducing cement admixtures
AssigneeW. R. Grace & Co.-Conn.
InventorPaul Scheiner
Life of this patent
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Abstract
A method for making, clean, bughole-free hardened cement structural units, including the steps of a) applying a release agent to the surface of a form; b) preparing a cement composition; c) adding to the cement composition a water-soluble polymer dispersant and a solution viscosity-reducing agent; d) placing the cement composition of step c) into the form, e) curing the cement composition of step c) to form a hardened structural unit, and f) removing the structural unit from the form.
Claims7
A method of making a substantially bughole-free cement structural unit having a substantially smooth and clean formed surface, comprising the steps of
- a) providing a form;
- b) preparing a cement composition;
- c) adding to said cement composition:
- a water-soluble polymer dispersant, said water-soluble polymer dispersant defined as any water-soluble polymeric compound that functions as a dispersant or hydraulic cement superplasticizer, and comprises 1) a polymeric backbone moiety and 2) polymeric side chain moieties, wherein one of said 1) and 2) polymeric moieties is a polyether moiety, and the other is a non-polyether moiety formed by polymerization of ethylenically-unsaturated monomers;
- and a solution viscosity-reducing agent, said solution viscosity-reducing agent being a water-soluble compound, which, when added to a solution of said water-soluble polymer dispersant, reduces its viscosity;
- d) placing said cement composition of step c) into said form,
- e) curing said placed cement composition in said form to form a hardened structural unit, and
- f) removing said hardened structural unit from said form,
- whereby said substantially bughole-free cement structural unit having a substantially smooth and clean formed surface is obtained.
A method of making a substantially bughole-free cement structural unit having a substantially smooth and clean formed surface, comprising the steps of
- a) applying a release agent to a surface of a form;
- b) preparing a cement composition;
- c) adding to said cement composition:
- a water-soluble polymer dispersant, said water-soluble polymer dispersant defined as any water-soluble polymeric compound that functions as a dispersant or hydraulic cement superplasticizer, and comprises 1) a polymeric backbone moiety and 2) polymeric side chain moieties, wherein one of said 1) and 2) polymeric moieties is a polyether moiety, and the other is a non-polyether moiety formed by polymerization of ethylenically-unsaturated monomers;
- and a solution viscosity-reducing agent, said solution viscosity-reducing agent being a water-soluble compound, which, when added to a solution of said water-soluble polymer dispersant, reduces its viscosity;
- d) placing said cement composition of step c) into said form,
- e) curing said placed cement composition in said form to form a hardened structural unit, and
- f) removing said hardened structural unit from said form,
- whereby said substantially bughole-free cement structural unit having a substantially smooth and clean formed surface is obtained.
Dependencies are inferred from the claim text.