JPH11226559A - Production of granule from raw material of ready mixed concrete sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing granules from the raw material of ready mixed concrete sludge which is uniform in composition and properties and has properties equivalent to solidified mortar. SOLUTION: The water content of dewatered cake produced by a pressure dewatere is adjusted, powdered ready mixed concrete sludge is added while being agitated at a high speed using a kind of mineral fine powder derived from aggregate contained in the dewatered cake as a crushing medium by a medium agitation type crusher, the pulverized mud-shaped raw concrete sludge is cured, crushed, and classified by screening. The obtained granules is excellent in uniformity and porous, absorbs liquid, applicable to various purposes including oil absorbents, flooring materials for pets, plant growing materials, and road freezing preventing materials, enabling industrial waste to be used efficiently as sources.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for effectively utilizing ready-mixed concrete sludge, which is industrial waste, as a resource.

[0002]

2. Description of the Related Art A study on a method of effectively using ready-mixed concrete sludge as a resource is disclosed in the report of the Japan Concrete Institute, Concrete Sludge Effective Utilization Research Committee report, and the symposium on effective use of concrete sludge. I have.

[0003]

The dewatered cake of ready-mixed concrete sludge can be used for various purposes if it is made into granules or powder. However, in order to use it effectively as a resource, it is shown in the notification of the Ministry of Health and Welfare in the Waste Management and Cleaning Law. It is necessary to have properties equivalent to those of the solidified mortar. The shape of the dehydrated cake is a lump having both sides flat and an irregular shape in cross section and size. What was obtained by simply drying and pulverizing the dehydrated cake to obtain a granular material or powder had a problem that the composition and properties varied, and this condition could not be satisfied.

[0004] The present invention provides a composition having no variation in properties and properties.
An object of the present invention is to provide a method for producing a granular material using raw concrete sludge as a raw material, which has properties equivalent to solidified mortar.

[0005]

Means for Solving the Problems It has been discovered that when a dewatered cake is subjected to impact crushing at a high speed rotation, a solid dewatered cake mass becomes muddy. By utilizing this phenomenon, the above object can be achieved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples. Ready-mixed concrete sludge has been landfilled as dewatered cake with a pressure dehydrator as industrial waste, so there is no precedent for making it into a muddy state, and there is no equipment. The agglomerate was made muddy with a high-speed rotary impact crusher, and a medium stirring type pulverizer focused on mineral fines derived from aggregates contained in the dehydrated cake, and was stirred at high speed as a pulverizing medium to make it finer. The muddy ready-mixed concrete sludge is hardened, crushed, and classified by sieving.

[0007] The water content of the dewatered cake produced by the pressurized dewatering machine is adjusted, and the medium is stirred at a high speed with a medium stirring type pulverizer using a fine powder of minerals derived from aggregates contained in the dewatered cake as a pulverizing medium. The ready-mixed concrete sludge is added to harden the fine muddy ready-mixed concrete sludge, crushed, and classified by screening.

The muddy raw concrete sludge which has been stirred at high speed by a medium stirring type pulverizer is made into a plate-like form and is naturally hardened, and the solidified material is crushed by a twin-screw roller type crusher. 0.75 mm and 4.75 mm
The mixture was classified by sieving at 1.18 mm, and a granular material using raw concrete sludge having the same properties as the solidified mortar as the raw material without variation in composition and properties could be obtained.

[0009] A dewatered cake having a water content of 60% is produced by a pressure dehydrator, and is sieved and classified into a 60% water content ready-mixed concrete sludge with a sieve of 1.18 mm or less while being stirred at a high speed by a medium stirring type pulverizer. 20% of powdered fresh concrete sludge is added, and the fresh concrete sludge is made into a finely-divided mud having a water content of 50%, and is naturally hardened. The solidified material is crushed by a twin-screw roller crusher and sieved. Eye 1
3.2mm to 4.75mm and 4.75mm to 1.18
The mixture was sieved and classified by mm to obtain granules made of ready-mixed concrete sludge having the same properties as the solidified mortar without variation in composition and properties.

[0010]

Since the present invention is configured as described above, it has the following effects.

[0011] Granules and powders obtained by simply drying and pulverizing a dewatered cake of ready-mixed concrete sludge vary in composition and properties. However, fine particles of mineral substances derived from aggregates are dispersed in a medium of a medium stirring type pulverizer. And the mineral fines are also abraded and pulverized to form S, a constituent component of the mineral fines.
A hydrated reaction occurs between iO ₂ , Al ₂ O _3, etc. and the dehydrated cement component by fine pulverization and hardens, so that ready-mixed concrete sludge having the same properties as solidified mortar without variation in composition and properties. Can be obtained as a raw material.

The granular material thus formed is very uniform and porous, and absorbs liquid material, so that it can be used for various purposes such as oil absorbing material, pet flooring, plant growing material, road surface freezing suppressing material, etc. Waste can be effectively used as a resource.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B28C 7/00 B09B 3/00 301E

Claims (3)

[Claims] 1. A method for producing a granular material using raw concrete sludge as a raw material, comprising solidifying a dewatered cake of ready-mixed concrete sludge and then solidifying it. 2. The method for producing a granular material from ready-mixed concrete sludge as claimed in claim 1, wherein the fine powder of mineral matter contained in the dewatered cake is made into a muddy state as a grinding medium. 3. The method for producing a granular material using raw concrete sludge as a raw material according to claim 1, wherein powdery raw concrete sludge is mixed with mud-like raw concrete sludge and solidified.