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Metamorphite machine-made sand concrete capable of inhibiting alkali activity of metamorphite aggregate and preparation method thereof

A technology of metamorphic rock and machine-made sand, which is applied in the field of long-term durability of concrete and building materials, and achieves the effects of simple preparation method, reduced environmental damage, and reduced expansion rate

Inactive Publication Date: 2013-05-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of rock contains a certain amount of microcrystalline quartz components and has potential alkali silicic acid activity. It is a slow expansion active aggregate, so it has not been widely used in concrete.

Method used

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  • Metamorphite machine-made sand concrete capable of inhibiting alkali activity of metamorphite aggregate and preparation method thereof
  • Metamorphite machine-made sand concrete capable of inhibiting alkali activity of metamorphite aggregate and preparation method thereof
  • Metamorphite machine-made sand concrete capable of inhibiting alkali activity of metamorphite aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] To prepare C25 metamorphic rock aggregate machine-made sand concrete ingredients for bridges, roadbeds, tunnels and culverts in a project:

[0042] Fly ash: secondary fly ash;

[0043] Water reducing agent: Mapei polycarboxylic acid water reducing agent, the solid content is greater than 20wt%;

[0044] Air-entraining agent: sodium dodecylbenzene sulfonate;

[0045] Coarse aggregate: continuous graded metamorphic rock gravel, with a maximum particle size of 30mm, a needle-like particle content of 11.2wt%, a porosity of 29%, and a stone powder content of 7.3wt%;

[0046] Fine aggregate: Metamorphic rock machine-made sand, in which the content of stone powder is 7.3wt%.

[0047] Cement: Wumengshan P.O42.5 cement;

[0048] Lithium compound: LiOH;

[0049] Silane powder;

[0050] water;

[0051] Table 1 Mix ratio of C25 metamorphic rock aggregate machine-made sand concrete

[0052]

[0053] The preparation process is: (1) Weigh the raw materials of each component according to the ratio; (2...

Embodiment 2

[0057] To prepare C30 metamorphic rock aggregate machine-made sand concrete ingredients for bridges, roadbeds, tunnels and culverts in a project:

[0058] Fly ash: secondary fly ash;

[0059] Water reducing agent: Mapei polycarboxylic acid water reducing agent, the solid content is greater than 20wt%;

[0060] Air-entraining agent: Rosin soap air-entraining agent;

[0061] Coarse aggregate: continuous graded metamorphic rock gravel, with a maximum particle size of 30mm, a needle-like particle content of 11.2wt%, a porosity of 29%, and a stone powder content of 7.3wt%

[0062] Fine aggregate: metamorphic rock machine-made sand, in which the content of stone powder is 7.3wt%;

[0063] Lithium compound: Li 2 CO 3 ;

[0064] Cement: Kaili Ruian P.O42.5 cement;

[0065] Silane emulsion; water;

[0066] Table 2 Mix ratio of C30 metamorphic rock aggregate machine-made sand underwater concrete

[0067]

[0068] The preparation process is the same as in Example 1. At the same time, a standard test p...

Embodiment 3

[0071] To prepare C30 metamorphic rock aggregate machine-made sand pumping concrete batching for bridges, roadbeds, tunnels and culverts in a project:

[0072] Fly ash: secondary fly ash;

[0073] Water reducing agent: Mapei polycarboxylic acid water reducing agent, the solid content is greater than 20wt%;

[0074] Air-entraining agent: sodium lauryl sulfate;

[0075] Coarse aggregate: continuous graded metamorphic rock gravel, with a maximum particle size of 30mm, a needle-like particle content of 11.2wt%, a porosity of 29%, and a stone powder content of 7.3wt%;

[0076] Fine aggregate: metamorphic rock machine-made sand, in which the content of stone powder is 7.3wt%;

[0077] Lithium compound: Li 2 CO 3 ;

[0078] Cement: Kaili Ruian P.O42.5 cement;

[0079] Silane powder; water;

[0080] Table 3 Mix ratio of C30 metamorphic rock aggregate machine-made sand pumped concrete

[0081]

[0082] The preparation process is the same as in Example 1. At the same time, a standard test piece was p...

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Abstract

The invention relates to a metamorphite machine-made sand concrete capable of inhibiting alkali activity of metamorphite aggregate, which comprises 100 parts of cement, 10-60 parts of fly ash, 0.05-0.8 part of lithium compound, 0.1-2.0 parts of silane, 0.5-4 parts of water reducing agent, 0.005-0.07 part of air entraining agent, 190-480 parts of fine aggregate, 200-480 parts of coarse aggregate and 30-80 parts of water. The preparation method comprises the following steps: after mixing the cement and silane, adding the coarse aggregate, fine aggregate, fly ash, lithium compound and air entraining agent, continuing the dry mixing, dissolving the water reducing agent in water to obtain a water solution, adding the water solution, and continuing stirring to obtain the metamorphite machine-made sand concrete. By using the metamorphite machine-made sand and metamorphite gravel as aggregate, the invention fully utilizes the environmental resources, greatly lowers the manufacturing cost of concrete engineering, and reduces the environmental load; and the prepared concrete product has obvious inhibiting effect on alkali-aggregate reaction of the metamorphite concrete with alkali activity.

Description

Technical field [0001] The invention relates to a metamorphic rock machine-made sand concrete that inhibits the alkali activity of metamorphic rock aggregates and a preparation method thereof, and belongs to the field of long-term concrete durability technology and building materials in traffic, bridge and road engineering. Background technique [0002] Alkali-aggregate reaction refers to the occurrence between certain alkali-active mineral components in concrete aggregates (sand, stone) and soluble alkaline solutions (mainly KOH, NaOH) from cement and additives in the concrete pores The swelling reaction of these alkaline solutions may come from this reaction causing concrete volume expansion or even cracking, changing the microstructure of concrete, making concrete’s compressive strength, flexural strength, elastic modulus and other mechanical properties significantly reduced, and seriously affecting the structure Safe use. Since the alkali-aggregate reaction generally occurs ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 蒋正武邓子龙肖鑫
Owner TONGJI UNIV
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