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A kind of fire-free lightweight aggregate, lightweight concrete and its preparation

A lightweight concrete and lightweight aggregate technology, applied in the field of concrete, can solve the problems of low strength and high water absorption, and achieve the effects of stable performance, reduced water absorption and large production capacity

Inactive Publication Date: 2019-07-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Aiming at the common problems of high water absorption and low strength of the existing lightweight aggregate preparation methods, the present invention provides a preparation method of non-fired lightweight aggregate, which aims to reduce the water absorption of the prepared lightweight aggregate, strengthen the strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Its preparation method of high-strength and low-thermal conductivity lightweight concrete based on overmolding comprises the following steps (1):

[0064] Step (1): Preparation of lightweight aggregate:

[0065] The lightweight aggregate is a non-burning high-performance lightweight aggregate, and its preparation method includes the following steps: mixing the materials uniformly according to the raw material formula of the sintering-free lightweight aggregate, and then extruding to obtain a block, and then making the The block is naturally cured and then classified and broken by a crusher, and the high-performance non-sintering-free lightweight aggregate is obtained after screening; the raw materials include cement, fly ash, aggregate and water; based on the total weight of raw materials; , the weight percentage of cement is 20%, the weight percentage of fly ash is 10%, the weight percentage of aggregate is 60%; the weight percentage of water is 10%, and the described ...

Embodiment 2

[0071] Compared with Example 1, the difference is that in step (2), the preparation of lightweight concrete:

[0072] Step 1: Take 1234kg of light aggregate and 494kg of cement, put them into a mixer for dry mixing, and mix them evenly.

[0073] Step 2: Add 257kg of water and 2.96kg of polycarboxylate superplasticizer, stir for 120 seconds and discharge to obtain lightweight aggregate concrete.

[0074] The bulk density of the lightweight aggregate concrete prepared in this example is 1840-1860kg / m3, the compressive strength at the 28-day age is 40-45Mpa, the elastic modulus at 28 days is 20-22Gpa, and the flexural strength at 28 days is 4.0-45Mpa. 4.3MPa, 28-day splitting tensile strength is 3.0-3.2MPa, thermal conductivity is 0.5-0.55W / (m*K).

Embodiment 3

[0076] Compared with Example 1, the difference is that in step (2), the preparation of lightweight concrete:

[0077] Step 1: Take 1265kg of light aggregate and 436kg of cement, put them into a mixer for dry mixing, and mix them evenly.

[0078] Step 2: Add 249kg of water and 3.49kg of polycarboxylate superplasticizer, stir for 120 seconds and discharge to obtain lightweight aggregate concrete.

[0079] The bulk density of the lightweight aggregate concrete prepared in this example is 1900-1920kg / m3, the compressive strength at the age of 28 days is 45-55Mpa, the elastic modulus at 28 days is 25-28Gpa, and the flexural strength at 28 days is 4.4-55Mpa. 4.6MPa, 28-day splitting tensile strength is 3.0-3.2MPa, thermal conductivity is 0.5-0.58W / (m*K).

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Abstract

The invention discloses a burning-free light aggregate preparation method, and a high strength and low thermal conductivity lightweight concrete based on secondary molding and a preparation method thereof. The preparation method specifically comprises: preparing a light aggregate, uniformly mixing 2.2-3.65 parts of the light aggregate, 1 part of cement and 0.00-0.30 part of fly ash, and adding 0.32-0.75 part of water and 0.003-0.012 part of a polycarboxylic acid water reducing agent to obtain the light aggregate concrete. The invention further provides the lightweight concrete prepared through the preparation method, wherein the raw materials and the preparation method of the light aggregate are defined in the claims of the specification. According to the present invention, the light aggregate concrete does not require the pre-wetting process, has advantages of good stability, excellent mechanical property, excellent durability and low thermal conductivity, and is the energy-saving and high-performance structure lightweight aggregate concrete.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a lightweight aggregate prepared by an unfired process and a preparation method of high-strength and low-thermal-conduction lightweight concrete based on secondary molding. Background technique [0002] Green energy saving is a major trend in the development of today's era. The 13th Five-Year Plan proposes to include "adhere to green development, strive to improve the ecological environment, adhere to green prosperity, green benefit people, and promote the formation of green development methods and lifestyles." Included. The National Development and Reform Commission and the Ministry of Housing and Urban-Rural Development's "City Adaptation to Climate Change Action Plan" clearly states that by 2020, the proportion of green building promotion will reach 50%. [0003] However, according to statistics from the Ministry of Housing and Urban-Rural Development, China's building energy consumpt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/02C04B28/04C04B111/40
CPCC04B18/027C04B28/04C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B2201/52C04B18/021C04B18/08C04B18/10C04B18/12C04B18/16C04B2103/302
Inventor 欧阳震宇黄鑫蒋利
Owner CENT SOUTH UNIV
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