CHEMICAL SOIL SOLIDIFICATION AND CHEMICAL SEALING OF LEAKING CONCRETE

THE UNDERLYING PRINCIPLES OF CHEMICAL SOIL SOLIDIFICATION AND OF CHEMICAL SEALING OF LEAKING CONCRETE, TOGETHER WITH MANY USES OF THE PROCESSES IN WATER WORKS AND OTHER PUBLIC UTILITIES CONSTRUCTION ARE OUTLINED. THE JOOSTEN METHOD OF CHEMICAL SOILS SOLIDIFICATION IS USED. THE IMMEDIATE SOLIDIFICATION OF LOOSE SILICEOUS DEPOSITS AND SIMILAR POROUS MATERIAL TAKES PLACE AFTER THE CONSECUTIVE INJECTION OF TWO TRUE SOLUTIONS THROUGH SUITABLY SPACED PIPES DRIVEN INTO THE GROUND. THE FIRST CHEMICAL CONSISTS MAINLY OF A COMMERCIAL BRAND OF SILICATE OF SODA TO WHICH HAVE BEEN ADDED SMALL AMOUNTS OF CERTAIN METALLIC SALTS TO RETARD THE RAPID GEL-FORMING REACTION WHICH OCCURS WHEN IT IS BROUGHT IN CONTACT WITH GASES OR WITH THE SECOND CHEMICAL, A SOLUTION OF STRONG CALCIUM CHLORIDE. THE RESULTING GEL FILLS THE VOIDS IN THE SOIL AND BINDS THE GRAIN PARTICLES TOGETHER INTO A SOLID, PERMANENT, SANDSTONE-LIKE MASS OF A HARDNESS WHICH INCREASES WITH AGE. THIS MASS IS INSOLUBLE IN WATER. THIS PROCESS IS USEFUL IN THE CONSTRUCTION AND MAINTENANCE OF WATERWORKS AND RELATED PUBLIC UNDERGROUND STRUCTURES, INCLUDING TUNNELS, SHAFTS, INTAKES, COFFERDAMS AND UNDERPINNING WORK. STOPPING LEAKAGES IN CONCRETE AND OLD BRICK OR MASONRY WALLS OR SEALING PERVIOUS STRATA OF ROCK FOUNDATIONS OF LARGE DAMS IS EFFECTIVELY ACCOMPLISHED BY INJECTION OF THE JOOSTEN CHEMICALS. BASICALLY, THE SAME CHEMICALS ARE INJECTED INTO PRE-DRILLED HOLES, THE DIAMETERS OF WHICH WILL DEPEND ON THE THICKNESS OF THE WALLS AND ON OTHER CONSIDERATIONS. THE HOLES ARE LOCATED SO THAT THEY INTERSECT THE LEAKING SEAM OR CRACK IN THE CONCRETE. INSERTED IN THE HOLES ARE INJECTORS SELECTED TO SUIT THE VARYING CONDITIONS. AFTER THE INJECTORS ARE FASTENED AND TIGHTENED, THE FIRST CHEMICAL IS INJECTED. THIS FORCES THE WATER OUT OF THE SEAM. THEN THE SECOND CHEMICAL IS INJECTED AND THE SEALING GEL IS FORMED IMMEDIATELY UPON CONTACT OF THE TWO CHEMICALS. CEMENT GROUTING SHOULD BE TRIED FIRST TO DETERMINE IF EFFECTIVE. THE JOOSTEN PROCESS DOES NOT ATTEMPT TO COMPETE WITH CEMENT OR CONCRETE GROUTING. ITS APPLICATION IS WHERE THE LIMITS OF PRACTICAL USE OF CONCRETE OR CEMENT GROUTING ARE REACHED, AND WHERE SPECIAL PROBLEMS AND UNUSUAL CONDITIONS PREVAIL.

  • Supplemental Notes:
    • Vol 37, No 9, PP 849-862, 10 FIG, 1 TAB
  • Authors:
    • Riedel, C M
  • Publication Date: 0

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  • Accession Number: 00231441
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 1:53AM