Grout-Based Matrices

In the past, many failures occurred cOTiceming mainly side effects due to invasive retrofitting interventions on the MHS ensembles. The current evolution in this field focuses on the development of compatible grouts, fiowable mortars, and repointing mortars for irreversible type consolidation of the mass of the masonry corpus. Besides, steel and other fiber reinforcement bonded on the surface of masonry with materials of polymeric- or cement-based matrix are used as reversible interventions. 

This technique (also known as the Grout reduction or Cholesky factorization) is based on the transfonnation of the matrix of coefficients in a system of algebraic equations into the product of lower and upper triangular matrices as... 

Hydrolysis. NMR results show that TBT carboxylates undergo fast chemical exchange. Even the interfacial reaction between TBT carboxylates and chloride is shown to be extremely fast. The hydrolysis is thus not likely to be a rate determining step. Since the diffusivity of water in the matrix is expected to be much greater than that of TBTO, a hydrolytic equilibrium between the tributyltin carboxylate polymer and TBTO will always exist. As the mobile species produced diffuses out, the hydrolysis proceeds at a concentration-dependent rate. Godbee and Joy have developed a model to describe a similar situation in predicting the leacha-bility of radionuclides from cementitious grouts (15). Based on their equation, the rate of release of tin from the surface is ... 

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