Tectoaluminosilicate cement and a process for its manufacture

Details Tectoaluminosilicate cement and a process for its manufacture Tectoaluminosilicate cement and a process for its manufacture

1992-06-09

1994-12-13

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106709, 106713, C04B 706

Patent

active

053726405

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a tectoaluminosilicate cement containing K, Ca and alumosilicate together, where applicable, with Li, Na and Mg, a bonding matrix obtained from the tectoaluminosilicate cement, through a reaction with H.sub.2 O in a ratio of from 3:1 to 6:1, a concrete with a bonding matrix, standard aggregates in a ratio of from 1:2 to 1:3 and a bonding agent/water ratio of from 5:1 to 3.3:1, and a process for the manufacture of a thermically alkali-activated aluminosilicate as a reactive silica for the manufacture of the tectoaluminosilicate cement.
Hydraulically solidifying inorganic bonding agents based on calcium and aluminium silicate have been known since ancient times. More recently, various bonding agents, both standard and specialized, have been developed (of main classification CO4 of the International Patent Classification).
The tectoaluminosilicate cement of the invention is distinguished from bonding agents existing in current technology by its composition as well as by the characteristics of the bonding matrix and of the concrete so produced.
From the tectoaluminosilicate cement of the invention, a bonding matrix is obtained. The preferred embodiment is a bonding matrix.
A concrete made in accordance with the invention, using the bonding matrix of the invention, is defined in and a preferred embodiment.
A process in accordance with the invention for the manufacture of a thermically alkali-activated aluminosilicate as a reactive silica for the manufacture of the tectoaluminosilicate cement.
The bonding matrix based on tectoaluminosilicate cement in accordance with the invention may be used as an inorganic hydraulic bonding agent setting quickly to a high degree of hardness. Compared with traditional hydraulically hardening bonding agents such as Portland and alumina cements, it is distinguished by a combination of higher mechanical, chemical and mineralogical strength usually attained only by special cements.
The characteristics of the bonding matrix of the invention result from the dense structure of cryptocrystalline xenomorphic microcrystals in a perlite matrix and from their chemical-physical composition. The dense perlite structure leads to minimal porosity and permeability as well as to an optimal mechanical load capacity.
Unlike traditional hydraulic bonding matrixes, the pores which do exist are closed (i.e. the pores are not interconnected) and are statistically distributed. The microcrystals (the mineral components) have similar physical and chemical characteristics to each other. For this reason, there is no appearance of preferential cracking zones under mechanical load. However, the arrangement of the microcrystals produces a flexibility comparable to that of traditional hydraulic cements.
In contrast to a bonding matrix based on tectoaluminosilicate cement in accordance with the invention, the hardening mechanism of traditional hydraulic cements mainly requires hydration, i.e. an excess of water remains in the bonding matrix, which determines its inherent porosity and permeability.
With traditional hydraulic bonding agents, which harden at ambient temperature (-5.degree. C. to +30.degree. C.), the bonding matrix also consists of interwoven microcrystals which, as in the case of Portland cement, differ greatly in their chemical composition, crystal structure and chemical-physical characteristics or which, as in the case of alumina cement, have metastable crystal phases.
The tectoaluminosilicate cement-based bonding matrix of the invention consists of tectosilicate microcrystals which have very similar chemical-physical characteristics to traditional hydraulic bonding agents but which are clearly different in their crystal structure, properties and formation.
The tectoaluminosilicate cement-based bonding matrix of the invention combines the high mechanical load capacity, impermeability and corrosion resistance of ceramic materials with the flexibility and the quick-setting at ambient temperature of hydraulic special cements.
The tectoaluminosilicate cement-based bonding ma

REFERENCES:
patent: 4153655 (1979-05-01), Minnick et al.
patent: 4640715 (1987-02-01), Heitzmann et al.
patent: 4642137 (1987-02-01), Heitzmann et al.
Chemical Abstract -"Study of hydration of glass like analogs of the Calcium Oxide-Aluminum Oxide-Silicon Dioxide System in the Presence of Alkali Metal Compounds" Krivenko et al. (USSR) (Sep. 1989) Zh. Prikl. Khim. (Leningrad) 62(4) pp. 796-804.

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