Sponge city high-strength and high-toughness recycled aggregate concrete and its preparation method

A recycled aggregate and sponge city technology, applied in the field of building materials, can solve the problems of unsatisfactory toughness and crack resistance, low strength, application limitations, etc., and achieve improved microscopic stress-strain performance, low cost, and easy processing Effect

Active Publication Date: 2017-06-27
ZHONGHUAN BUILDING FUJIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for recycled aggregate permeable concrete, the strength of concrete usually prepared at present is low, which limits its application in sponge cities. The reason for this phenomenon is that the strength of recycled aggregate pervious concrete increases, and its toughness The crack resistance cannot meet the requirements. Therefore, the patent of the present invention designs a sponge city high-strength and high-toughness recycled aggregate permeable concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] First prepare modified silica nanotubes:

[0039] (1) Put 30 stainless steel balls with a diameter of 10 mm and 45 stainless steel balls with a diameter of 5 mm in two identical 5 L nylon tanks, then add 0.9 kg of silica nanotubes respectively, and then drop Add 90 ml of absolute ethanol and seal it with a nylon cover; put two ball mill jars into the ball mill symmetrically, and ball mill for 48 h under the condition that the rotation speed is 400 rpm and the rotation direction is automatically changed every 30 minutes;

[0040] (2) Add the silica nanotubes treated in step (1) into an aqueous solution of Tween 20 with a pH of 8 and a concentration of 20 wt%, sonicate for 18 h, filter, wash with water, and vacuum at 55°C Dry for 15 hours;

[0041] (3) Take the silica nanotubes treated in step (2) and stir in 40 L of sodium hydroxide aqueous solution with a concentration of 35wt% for 48 hours, filter, wash the powder with pure water, and vacuum at 60°C Dry for 18 hours;...

Embodiment 2

[0055] First prepare modified silica nanotubes:

[0056] (1) Put 30 stainless steel balls with a diameter of 10 mm and 45 stainless steel balls with a diameter of 5 mm in two identical 5 L nylon tanks, then add 0.9 kg of silica nanotubes respectively, and then drop Add 90 ml of absolute ethanol and seal it with a nylon cover; put two ball mill jars into the ball mill symmetrically, and ball mill for 48 h under the condition that the rotation speed is 400 rpm and the rotation direction is automatically changed every 30 minutes;

[0057] (2) Add the silica nanotubes treated in step (1) into an aqueous solution of Tween 20 with a pH of 8 and a concentration of 20 wt%, sonicate for 18 h, filter, wash with water, and vacuum at 57°C Dry for 15 hours;

[0058] (3) Take the silica nanotubes treated in step (2) and stir in 40 L of 35 wt% sodium hydroxide aqueous solution for 48 hours, filter, wash the powder with pure water, and vacuum at 59°C Dry for 18 hours;

[0059] (4) Take the...

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PUM

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a sponge municipal high-strength high-toughness regenerated aggregate concrete and a preparation method thereof. The concrete comprises the following raw materials in parts by weight: 320-360 parts of cement, 40-80 parts of lithium slag powder, 20-40 parts of silica fume, 700-900 parts of regenerated coarse aggregate, 500-400 parts of natural coarse aggregate, 20-30 parts of superfine microbead, 3-4 parts of water reducing agent, 100-120 parts of water, 10-20 parts of polyacrylate, 10-20 parts of adhesive, 20-30 parts of toughening material, 1-1.2 parts of triethanolamine and 0.05-0.1 part of sodium gluconate. The toughening material can be sufficiently dispersed in the concrete, effectively displays the synergic toughening effect of the material, and endows the integral concrete with favorable toughness, isotropy and fatigue resistance.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a sponge city high-strength and high-toughness recycled aggregate concrete and a preparation method thereof. Background technique [0002] Sponge city construction should follow the principles of ecological priority, combine natural approaches with artificial measures, and ensure the safety of urban drainage and waterlogging, maximize the accumulation, infiltration and purification of rainwater in urban areas, and promote the utilization of rainwater resources and ecological environment protection. The construction of "sponge city" is not to overthrow and replace the traditional drainage system, but to "reduce the burden" and supplement the traditional drainage system, so as to maximize the role of the city itself. In the process of sponge city construction, the systematic nature of natural precipitation, surface water and groundwater should be coordinated, water su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B24/26
CPCC04B28/00C04B40/0039C04B2103/0068C04B2103/302C04B2103/44C04B18/141C04B18/146C04B18/167C04B24/045C04B24/122C04B24/10C04B22/06C04B24/00C04B24/40C04B24/2688C04B24/226C04B24/2623C04B24/2664C04B22/08
Inventor 梁文贤林志东姜旭蒋德烽陈龙辉
Owner ZHONGHUAN BUILDING FUJIAN CO LTD
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