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A method and system for constructing a concrete waterstop joint between first and second concrete portions. The method may include applying a continuous longitudinal cementitious and reactive waterproofing grout strip to a joint area of the first concrete portion and then forming the second concrete

A method and system for constructing a concrete waterstop joint between first and second concrete portions. The method may include applying a continuous longitudinal cementitious and reactive waterproofing grout strip to a joint area of the first concrete portion and then forming the second concrete portion over the grout strip. The system may include a first concrete portion having a joint area, a continuous cementitious and reactive waterproofing longitudinal grout strip connectable to the joint area, and a second concrete portion formable over the grout strip. There is also provided a use of a cementitious and reactive waterproofing grout strip in the construction of a concrete waterstop joint between first and second concrete portions.

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1. A method of constructing a concrete waterstop joint between first and second concrete portions comprising applying a continuous longitudinal cementitious and reactive waterproofing grout strip to a top surface of a joint area of said first concrete portion and forming said second concrete portion

1. A method of constructing a concrete waterstop joint between first and second concrete portions comprising applying a continuous longitudinal cementitious and reactive waterproofing grout strip to a top surface of a joint area of said first concrete portion and forming said second concrete portion over said grout strip such that said grout strip is self-sealing by chemically reacting in the presence of moisture to cause crystalline growth by crystalline formation for blocking migration of said moisture. 2. The method of claim 1 further comprising bringing said top surface of said joint area of said first concrete portion to a saturated/surface dry (SSD) condition prior to applying said continuous longitudinal cementitious and reactive waterproofing grout strip. 3. The method of claim 1 further comprising applying a cementitious and reactive waterproofing slurry to said top surface of said joint area. 4. The method of claim 1 or 3 further comprising applying a cementitious and reactive waterproofing slurry to said grout strip. 5. The method of claim 1, 3 or 4 further comprising forming the second concrete portion over said top surface of said joint area. 6. The method of claim 1 wherein said grout strip is formed to have a triangular cross-section. 7. The method of claim 6 wherein said triangular grout strip is formed to have an altitude to base ratio of 3:5. 8. The method of claim 1 wherein said grout strip is positioned substantially centrally along said top surface of said joint area. 9. The method of claim 1 wherein applying a continuous longitudinal cementitious and reactive waterproofing grout strip to a top surface of a joint area of said first concrete portion and forming said second concrete portion over said grout strip comprises applying said grout strip consisting of a putty when said grout strip is applied to said top surface of said joint area. 10. Use of a cementitious and reactive waterproofing grout strip in the construction of a concrete waterstop joint between a first concrete portion and a second concrete portion, said use comprising applying said grout strip to a top surface of a joint area of said first concrete portion such that said grout strip is self-sealing by chemically reacting in the presence of moisture to cause crystalline growth by crystalline formation for blocking migration of said moisture. 11. The use as defined in claim 10 further comprising using a cementitious and reactive waterproofing slurry on said top surface of said joint area. 12. The use as defined in claim 10 or 11 further comprising using a cementitious and reactive waterproofing slurry on said grout strip. 13. The use as defined in claim 10 wherein said grout strip has a triangular cross-section. 14. The use as defined in claim 13 wherein said triangular grout strip has an altitude to base ratio of 3:5. 15. The use as defined in claim 10 wherein said grout strip is positioned substantially centrally along said top surface of said joint area. 16. The use as defined in claim 10 wherein said grout strip consists of a putty when said grout strip is applied. 17. A concrete waterstop joint comprising: a first concrete portion having a top surface joint area;a continuous cementitious and reactive waterproofing longitudinal grout strip-connected to said top surface joint area; anda second concrete portion formed over said grout strip, wherein said grout strip is self-sealing by chemically reacting in the presence of moisture to cause crystalline growth by crystalline formation for blocking migration of said moisture. 18. The concrete waterstop joint of claim 17 further comprising a cementitious and reactive waterproofing slurry applied to said top surface joint area. 19. The concrete waterstop joint of claim 17 or 18 further comprising a cementitious and reactive waterproofing slurry applied to said grout strip. 20. The concrete waterstop joint of claim 17, 18 or 19 wherein said second concrete portion is formable over said top surface joint area. 21. The concrete waterstop joint of claim 17 wherein said grout strip has a triangular cross-section. 22. The concrete waterstop joint of claim 21 wherein said triangular grout strip has an altitude to base ratio of 3:5. 23. The concrete waterstop joint of claim 17 wherein said grout strip is positioned substantially centrally along said top surface joint area. 24. The concrete waterstop joint of claim 17 wherein said grout strip consists of a putty when said grout strip is being connected to said top surface joint area.