An additive for improving the crystallinity of hydrothermally synthesized calcium silicate hydrate

A calcium silicate hydrate, hydrothermal synthesis technology, applied in the field of building materials, can solve the problems of low crystallinity of calcium silicate hydrate, less gel content of calcium silicate hydrate, etc., to promote the formation of colloids, improve And enhance the strength, improve the effect of mechanical properties

Active Publication Date: 2021-05-28
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process, due to the limitation of reaction conditions, the content of calcium silicate hydrate gel is less, the conversion process of calcium silicate hydrate colloid to tober mullite crystal is limited, and the crystallinity of calcium silicate hydrate is relatively low. Low

Method used

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  • An additive for improving the crystallinity of hydrothermally synthesized calcium silicate hydrate
  • An additive for improving the crystallinity of hydrothermally synthesized calcium silicate hydrate
  • An additive for improving the crystallinity of hydrothermally synthesized calcium silicate hydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, lime-cement-sand aerated concrete is selected as the basic component of the silicate base material, and the raw material formulas of test groups 1-3 and comparison group 1 are shown in the following table:

[0026]

[0027] In the table above:

[0028] modifier a It is one or a mixture of aluminosilicate hydrate and sulfoaluminate hydrate;

[0029] enhancer b Glauber's salt and its mixture with one or two or more of sodium metasilicate, sodium aluminate, sodium citrate, and potassium sodium tartrate;

[0030] Ordinary sand c Silica content in the medium ≥ 68%;

[0031] cement d Label PO42.5, calcium oxide content 70%;

[0032] quicklime e Calcium oxide content > 80%.

[0033] Mix the basic components of the calcium silicate hydrate modifier, reinforcing agent, and silicate base material in the test groups 1 to 3 and the comparison group 1 in proportion, then stir evenly to obtain a high-strength and low-shrinkage silicate matrix slurry, an...

Embodiment 2

[0039] In this embodiment, lime-cement-fly ash aerated concrete is selected as the basic component of the silicate base material, and the raw material formulas of test groups 4-6 and comparison group 2 are shown in the following table:

[0040]

[0041] In the table above:

[0042] modifier a It is one or a mixture of aluminosilicate hydrate and sulfoaluminate hydrate;

[0043] enhancer b Glauber's salt and its mixture with one or two or more of sodium metasilicate, sodium aluminate, sodium citrate, and potassium sodium tartrate;

[0044] cement c Label PO42.5, calcium oxide content 70%;

[0045] quicklime d Calcium oxide content > 80%.

[0046] Mix the basic components of the calcium silicate hydrate modifier, reinforcing agent, and silicate base material in the test groups 4 to 6 and the comparison group 2 in proportion, then stir evenly to obtain a high-strength and low-shrinkage silicate matrix slurry, and then Mix and stir the foaming component with the high-stren...

Embodiment 3

[0051] In this embodiment, lime-cement-sand-fly ash aerated concrete is selected as the basic component of the silicate base material. The raw material formulas of test groups 7-9 and comparison group 3 are shown in the following table:

[0052]

[0053] In the table above:

[0054] modifier a It is one or a mixture of aluminosilicate hydrate and sulfoaluminate hydrate;

[0055] enhancer b Glauber's salt and its mixture with one or two or more of sodium metasilicate, sodium aluminate, sodium citrate, and potassium sodium tartrate;

[0056] Ordinary sand c Silica content in the medium ≥ 68%;

[0057] cement d Label PO42.5, calcium oxide content 70%;

[0058] quicklime e Calcium oxide content > 80%.

[0059] The basic components of calcium silicate hydrate modifier, reinforcing agent and silicate base material in test groups 7-9 and comparison group 3 were mixed in proportion and stirred evenly to obtain a high-strength and low-shrinkage silicate matrix slurry, and th...

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Abstract

The invention discloses an admixture for improving the crystallinity of hydrothermally synthesized calcium silicate hydrate, which belongs to the field of new building materials. By adding hydrated calcium silicate modifier and reinforcing agent to the silicate base material, it is beneficial to accelerate the conversion of hydrated calcium silicate colloid to tobermullite crystals during the hydrothermal reaction process, endowing hydrothermally synthesized silicic acid Salt-based material with high strength and low shrinkage performance, suitable for improving hydrated calcium silicate board produced by hydrothermal method, concrete high-strength pipe pile and lime-cement-sand aerated concrete, lime-cement-fly ash aerated concrete, Lime-cement-sand-fly ash aerated concrete and other hydrothermally synthesized silicate aerated concrete material properties.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an admixture for improving the crystallinity of hydrothermally synthesized calcium silicate hydrate. Background technique [0002] Calcium silicate hydrate (C-S-H) is CaO-SiO 2 -H 2 The general term for ternary compounds in the O system, an amorphous substance formed by the hydration of tricalcium silicate and dicalcium silicate, about 65% of the mass of Portland cement hydration products. Calcium silicate hydrate gel and tobermullite crystals are important hydration products of aerated concrete. The hydration products of uncured aerated concrete are flaky calcium hydroxide, needle-like ettringite and fibrous, network-like The hydration products of aerated concrete steamed at 1MPa are mainly leaf-shaped tobermullite and curly low-calcium calcium silicate hydrate, and the crystallization degree of tobermullite is relatively low. high. [0003] In calcium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/06C04B22/14C04B28/18C04B111/40C04B111/34
CPCC04B28/18C04B40/0039C04B2111/343C04B2111/40C04B22/142C04B22/08C04B22/147C04B22/0093C04B24/06
Inventor 蒋亚清潘亭宏王玉张风臣许文祥
Owner HOHAI UNIV
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