Method for sealing pipe and method for preparing composition useful therein

Claim 2

A PROCESS FOR SEALING SUBSTANTIALLY UNCLEANED PIPE COMPRISING THE STEP OF EXCAVATING THE SPACE AROUND A LEAKING PORTION OF SAID PIPE, PLACING A FORM AROUND SAID LEAKING PORTION OF PIPE, AND FILLING SAID FORM TO COVER SAID LEAKING PORTION WITH A CONCRETE-MAKING, PORTLAND CEMENT COMPOSITION CONTAINING ABOUT .0005-.05 PART BY WEIGHT OF A SURFACE ACTIVE AGENT PER PART OF CEMENT, SAID SURFACE ACTIVE AGENT BEING SELECTED FROM THE GROUP CONSISTING OF NONYL PHENOL POLYGLYCOL ETHERS CONTAINING 4 1/2-10 1/2 MOLS OF ETHYLENE OXIDE, ALKYL ARYL SULFONATES, AND SODIUM ALKYL ARYL SULFONATES THE ALKYL OF SAID SULFONATES HAVING 8 TO 15 CARBONS AND THE ARYL BEING A BENZENE RING, SAID COMPOSITION, WHEN CURED, BEING SUBSTANTIALLY IMPERMEABLE TO A GASEOUS MEDIUM, BEING CAPABLE OF ADHERING TO THE SUBSTANTIALLY UNCLEANED SURFACE OF SAID PIPE, AND HAVING A SHRINKAGE OF LESS THAN ABOUT 0.1% BY VOLUME.

Claim 3

A PROCESS FOR PREPARING A CONCRETE-MAKING CEMENT COMPOSITION USEFUL FOR SEALING LEAKING PORTIONS OF SUBSTANTIALLY UNCLEANED PIPE, SAID PROCESS COMPRISING THE STEPS OF MIXING TOGETHER ABOUT 1.0 PART BY WEIGHT OF PORTLAND CEMENT, ABOUT 2.6 PARTS BY WEIGHT OF CONCRETE SAND, ABOUT 2.0 PARTS BY WEIGHT OF COARSE AGGREGATE, ABOUT .025 PART BY WEIGHT OF IRON POWDER, ADDING A SOLUTION CONTAINING ABOUT .6 PART BY WEIGHT OF WATER AND ABOUT .02 PART BY WEIGHT OF CALCIUM CHLORIDE, AND THEN GENTLY FOLDING INTO THE MIXTURE ABOUT .002 PART BY WEIGHT OF A SURFACE ACTIVE AGENT OF NONYL PHENOL POLYGLYCOL ETHERS CONTAINING 9-10 MOLS OF ETHYLENE OXIDE, SAID SURFACE ACTIVE AGENT BEING CAPABLE OF WETTING THE INTERFACE BETWEEN SAID CONCRETE-MAKING COMPOSITION AND THE SURFACE OF SAID PIPE, WHEREBY, WHEN CURED, SAID COMPOSITION IS SUBSTANTIALLY IMPERMEABLE TO A GASEOUS MEDIUM, IS CAPABLE OF ADHERING TO THE SUBSTANTIALLY UNCLEANED SURFACE OF SAID PIPE, AND HAS A SHRINKAGE OF LESS THAN ABOUT 0.1% BY VOLUME.

Claim 4

A PROCESS FOR PREPARING A CONCRETE-MAKING CEMENT COMPOSITION USEFUL FOR SEALING LEAKING PORTIONS OF SUBSTANTIALLY UNCLEANED PIPE, SAID PROCESS COMPRISING THE STEPS OF MIXING TOGETHER ABOUT 1.0 PART BY WEIGHT OF PORTLAND CEMENT, ABOUT 2.6 PARTS BY WEIGHT OF CONCRETE SAND, ABOUT 2.0 PARTS BY WEIGHT OF COARSE AGGREGATE, ABOUT .025 PART BY WEIGHT OF IRON POWDER, ADDING A SOLUTION CONTAINING ABOUT .6 PART BY WEIGHT OF WATER AND ABOUT .02 PART BY WEIGHT OF CALCIUM CHLORIDE, AND THEN GENTLY FOLDING INTO THE MIXTURE ABOUT .002 PART BY WEIGHT OF A SURFACE ACTIVE AGENT OF NONYL PHENOL POLYGLYCOL ETHERS CONTAINING 9-10 MOLS OF ETHYLENE OXIDE, SAID SURFACE ACTIVE AGENT BEING CAPABLE OF WETTING THE INTERFACE BETWEEN SAID CONCRETE-MAKING COMPOSITION AND THE SURFACE OF SAID PIPE, WHEREBY, WHEN CURED, SAID COMPOSITION IS SUBSTANTIALLY IMPERMEABLE TO A GASEOUS MEDIUM, IS CAPABLE OF ADHERING TO THE SUBSTANTIALLY UNCLEANED SURFACE OF SAID PIPE, AND HAS A SHRINKAGE OF LESS THAN ABOUT 0.1% BY VOLUME.