Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of starch-based cement hydration heat control material

A technology of cement hydration and thermal control, which is applied in the field of building materials concrete admixtures, can solve the problems of complex material preparation process, unsatisfactory control effect, long reaction time, etc., to shorten the reaction time, slow down the heat release rate, and uniform properties stable effect

Active Publication Date: 2017-07-28
JIANGSU SOBUTE NEW MATERIALS +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the control effect of the existing cement hydration heat control material is not ideal, or the material preparation process is complicated, the reaction time is long, etc., the invention discloses a simple and efficient preparation method of a starch-based cement hydration heat control material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of starch-based cement hydration heat control material
  • A kind of preparation method of starch-based cement hydration heat control material
  • A kind of preparation method of starch-based cement hydration heat control material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of enzymolysis starch: 30g wheat starch is added with water to prepare starch milk with a concentration of 30wt%, pH is adjusted to 5.5 with sulfuric acid, and mixed amylase is added, wherein the amount of isoamylase added is 20U / g starch, and the amount of saccharification enzyme is 20U / g starch. The amount of enzyme added is 20U / g starch. The above starch milk was placed in a dual-frequency ultrasonic reactor for reaction, and the reaction temperature was adjusted to 50 ° C, the dual-frequency ultrasonic power was 400W, and the dual-frequency ultrasonic frequencies were 30kHz and 50kHz respectively, and the electric stirrer was used to continuously stir, and the rotating speed was 100r. / min, after the reaction for 1.5h, the pH was adjusted to below 3 with sulfuric acid to inactivate the enzyme for 30min, then the pH was adjusted to neutral with saturated sodium hydroxide, filtered, and the solid was dried in a 50°C oven until the water content was 6-8 ...

Embodiment 2

[0030] The preparation of enzymolysis starch: add water to 30g corn starch to prepare starch milk with a concentration of 50wt%, adjust pH to 6 with sulfuric acid, add mixed amylase, wherein the amount of isoamylase added is 40U / g starch, and the amount of saccharification enzyme is 40U / g starch. The amount of enzyme added is 30U / g starch. The above starch milk was placed in a dual-frequency ultrasonic reactor for reaction, the reaction temperature was adjusted to 55 ° C, the dual-frequency ultrasonic power was 600W, and the dual-frequency ultrasonic frequencies were respectively 30kHz and 60kHz, and the electric stirrer was used to continuously stir, and the rotating speed was 200r. / min, after the reaction for 1h, the pH was adjusted to below 3 with sulfuric acid to inactivate the enzyme for 30min, then the pH was adjusted to neutral with saturated sodium hydroxide, filtered, and the solid was dried in a 50°C oven until the water content was 6-8% , crushed, and passed throug...

Embodiment 3

[0033]Preparation of enzymatic starch: Add water to 30g of waxy corn starch to prepare starch milk with a concentration of 40wt%, adjust the pH to 6 with sulfuric acid, add mixed amylase, wherein the enzyme amount of isoamylase is 50U / g starch, and saccharify The amount of enzyme added is 30U / g starch. Put the above-mentioned starch milk in a dual-frequency ultrasonic reactor for reaction, adjust the reaction temperature to 50°C, the dual-frequency ultrasonic power to 700W, and the dual-frequency ultrasonic frequencies to 40kHz and 80kHz respectively, and use an electric stirrer to continuously stir at a speed of 250r / min, after reacting for 1.5h, use sulfuric acid to adjust the pH to below 3 to inactivate the enzyme for 30min, then use saturated sodium hydroxide to adjust the pH to neutral, filter, and dry the solid in an oven at 50°C until the water content is 6-8 %, pulverized and passed through a 200-mesh sieve.

[0034] Preparation of starch-based cement hydration heat ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a starch-based cement hydration heat regulating material, which comprises mixing a mixed dibasic acid anhydride and the enzymatic starch evenly, placing them in a microwave reactor for solid-phase reaction, and obtaining the starch-based cement hydration heat Regulatory material. The method is simple in process, greatly shortens the reaction time, improves the reaction efficiency, avoids the use of solvents, and reduces the harm of waste to the environment; the hydration heat control material prepared by this method can effectively slow down the hydration acceleration period and deceleration The heat release rate in the long term can reduce the peak heat release rate of hydration by more than 80%, and basically does not affect the strength of concrete in the middle and late stages.

Description

technical field [0001] The invention belongs to the field of building material concrete admixtures, in particular to a preparation method of a starch-based cement hydration heat regulation material. Background technique [0002] The hydration reaction of cement is an exothermic reaction. The concrete made by mixing cement with water and other aggregates will generate a large amount of hydration heat during the coagulation and hardening process after pouring. Since concrete is a poor conductor of heat and has a large volume, the heat of hydration accumulated inside the concrete is not easily dissipated, causing the internal temperature to rise sharply. At the same time, due to the rapid heat dissipation of the concrete surface, a large temperature difference between the inside and outside occurs, resulting in different degrees of thermal expansion and contraction between the inside and outside, which in turn generates tensile stress on the concrete surface. When the tensile ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38
Inventor 佘维娜冉千平乔敏吕志锋于诚吴井志刘加平
Owner JIANGSU SOBUTE NEW MATERIALS