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Compound early strength agent for foaming cement and ultralight foaming cement

A technology of compounding early strength agent and foamed cement, applied in the field of building materials, can solve problems such as unsatisfactory early strength effect, and achieve the effect of solving utilization problems, reducing production cost and improving early strength

Inactive Publication Date: 2019-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, adding additives such as chloride salt additives and nitrite alone in ultra-light foamed cement, the early strength effect is not ideal.

Method used

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  • Compound early strength agent for foaming cement and ultralight foaming cement
  • Compound early strength agent for foaming cement and ultralight foaming cement
  • Compound early strength agent for foaming cement and ultralight foaming cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of calcium silicate hydrate early strength agent

[0026] (1) Acid treatment of waste and old foamed cement materials:

[0027] A. The waste foamed cement material is pulverized by a ball mill, and the pulverized powder is soaked in 0.1mol / L acetic acid, wherein the mass ratio of the solid powder to the acetic acid solution is 1:3.

[0028]B. Filtrate the resulting treatment liquid, remove impurities by suction filtration, adjust the pH of the filtrate to 12 with NaOH solution, and remove impurities by suction filtration again to obtain waste liquid after acid treatment.

[0029] C, Utilize EDTA titration method to test Ca in the waste liquid of gained acid treatment 2+ Concentration, adjust the concentration to 0.1mol / L.

[0030] (2) Preparation of calcium silicate hydrate

[0031] The calcium silicate hydrate is prepared by chemical co-precipitation method, and the raw materials are divided into calcium source and silicon source, the calcium source i...

Embodiment 2

[0045] The foamed cement insulation board was prepared with reference to the method of Example 1, the difference being that the amount of self-made calcium silicate hydrate added when preparing the ultra-light foamed cement accounted for 30 wt% of the mass of the self-made additive.

Embodiment 3

[0047] Referring to the method of Example 1 to prepare foamed cement insulation boards, the difference is that the amount of self-made calcium silicate hydrate added when preparing ultra-light foamed cement accounts for 45 wt% of the mass of self-made additives.

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Abstract

The invention discloses a compound early strength agent for foaming cement and ultralight foaming cement. The compound early strength agent is prepared from hydrated calcium silicate and a homemade additive, wherein the amount of hydrated calcium silicate is 15%-60% of the mass of the homemade additive; the hydrated calcium silicate is prepared from waste foaming cement as a raw material; the homemade additive is a composite additive of NaCl, NaNO2 and CaCl2. The ultralight foaming cement doped with the compound early strength agent comprises cement, fly ash, silica fume, a foam stabilizer, awater reducer, polypropylene fiber, a vinyl acetate-ethylene copolymerization emulsion, hydrogen peroxide and the compound early strength agent, wherein in the compound early strength agent, the amount of hydrated calcium silicate is 15%-60% of the mass of the homemade additive. The compound early strength agent is doped for preparation of an ultralight foaming cement insulation board, the early strength and the later strength of the foaming cement insulation board can be effectively improved; besides, the waste foaming cement is taken as a raw material for preparation of the hydrated calciumsilicate, waste utilization is realized, and the production cost of the hydrated calcium silicate early strength agent can also be reduced.

Description

technical field [0001] The invention relates to a composite early-strength agent and its application, in particular to a composite early-strength agent for foamed cement and ultra-light foamed cement mixed with the composite early-strength agent, belonging to the field of building materials. 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 is the main hydration product of cement and the main source of the strength of inorganic cementitious materials such as cement concrete. Calcium silicate hydrate is added to cement as an early strength agent, which can effectively accelerate the hydration speed of cement; strengthen the structure of cement stone-aggregate interface area, improve the strength of cement stone, especially the early strength, and there is no shrinkage in the later strength; Reduce the number of harmful pores and improve the pore structure; at the same time, it does not aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B22/12C04B38/02
CPCC04B28/02C04B40/0039C04B2201/50C04B22/08C04B22/124C04B22/085C04B18/08C04B18/146C04B2103/48C04B2103/302C04B24/26C04B22/068C04B38/02
Inventor 潘钢华郑晓芳
Owner SOUTHEAST UNIV
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