TW201638440A - Composition of regeneration aggregate - Google Patents

Abstract

A composition of regeneration aggregate is formed by adequately mixing and blending each ingredient of the raw material. The raw material includes:50~70wt% of industrial inorganic slurry, 7~18wt% of cement, 7~37wt% of asphalt-scrapped fines content, 2~4wt% of water and 0.5~0.7wt% of chelation agent with respect to the total weight of the raw material. By using the chelation agent, the invention can adequately utilize the regeneration industrial inorganic slurry as the composition for the regeneration aggregate, meanwhile, by adding the asphalt-scrapped fines content obtained by reclaimed asphalt-scrapped material, the usage ratio of the reclaimed material and the cement does not form a single-way inverse relationship with respect to the compressive strength of the recycled aggregate within the composition mix portion range disclosed in the invention so that an engineer personal can obtain larger adjusting flexibility between the used amount of the reclaimed material and the strength of the regenerated concrete aggregate, at the same time, the composition can create the maximum elimination channel and path for two reclaimed materials of the industrial inorganic slurry and the asphalt-scrapped material, thus the invention can achieve better economic and environmental protection benefits.

Description

Recycled aggregate composition

The present invention relates to a composition of a regenerated aggregate, and more particularly to a composition of a controllable low strength material (CLSM).

Pressed, Controlled Low Strength Material (CLSM) is a self-filling material. It is mainly used as an alternative material that needs to be backfilled. According to the American Concrete Association (ACI), it has 28 days of non-resistance. The compressive strength does not exceed 1200 psi (about 84kg/cm ² ). Since the CLSM has no need to roll due to its self-leveling, it also has the easy re-excavation characteristics with low compressive strength. It is especially suitable for replacing the earth and stone backfill in places where the narrow or the machine is not easy to enter. For example, trench backfilling or road construction or repair works.

The existing controllable low-strength materials are mainly made of cement and cement materials such as Pozzolanic Material, and coarse and coarse aggregates (pellets) and water are mixed at a set ratio. If necessary, mineral-doped materials are used. Materials or chemical admixtures. However, in the composition of controllable low-strength materials, it is known that the types and ratios of coarse and fine aggregates are equivalent to the engineering properties, rheological behavior and hard-solid properties of CLSM. The impact, but for the selection and proportion of specific materials, the difference between the advantages and disadvantages of the engineering nature, is still at the stage of exploration, and has not accumulated sufficient and comprehensive information for the use of engineering personnel, this is disclosed in the Republic of China Patent No. I346093 A composition for controlling a low-strength material is composed of a specific proportion of waste ash, cement and resin, wherein the waste ash is a recycled material, so it can have certain environmental and economic benefits, but It only uses the waste ash of the same cementing material as the recycled material. The higher the proportion of the waste ash to replace the cement, the significantly lower the compressive strength of the controllable low-strength material, so that the amount of recycled materials can be used. The economic benefits will be limited. Furthermore, if the intensity is too low, the application range of the CLSM will be limited. Therefore, how to develop a ratio of recycled materials in the specific content range will not cause negative effects on the compressive strength. In order to ensure the engineering properties of CLSM and enhance its application range, and to greatly expand the controllable low-strength material composition of the decontamination pipeline of recycled (recycled) materials, it becomes a technical subject of importance and urgency.

In view of the existing controllable low-strength materials, the proportion of recycled materials has a negative influence on the compressive strength of the finished product, and there is a lack of elastic adjustment space that can balance the amount of recycled materials with the strength of the finished product. Therefore, it is an object of the present invention to provide a composition of a controllable low-strength material whose compressive strength is not necessarily lowered by an increase in the amount of the recycled material.

In order to achieve the above object, the present invention provides a composition of a regenerated aggregate material, which is obtained by mixing and kneading various components in a raw material and mixing them thoroughly. The raw material comprises: 50~ based on the total weight of the raw materials. 70 wt% of industrial inorganic sludge, 7 to 18 wt% of cement, 7 to 37 wt% of bitumen, fine particles, 2 to 4 wt% of water, and 0.5 to 0.7 wt% of a chelating agent.

By using the chelating agent, the present invention can fully utilize the recovered industrial inorganic sludge as a component of the regenerated aggregate, and at the same time, by adding the bitumen obtained by the recovered bitumen planing material, the present invention is Within the range of the composition ratio disclosed, the ratio of the recycled material to the cement is not in a unidirectional inverse relationship with the compressive strength of the recycled aggregate, so the amount of recycled material and the strength of the recycled concrete aggregate can be Get a bigger adjustment bomb At the same time, it can create the largest decontamination pipeline and route for the industrial inorganic sludge and asphalt planing materials, so that the invention can achieve better economic and environmental benefits.

The first figure is a flow chart of the steps of the process for producing the regenerated aggregate of the present invention.

Referring to the first figure, the present invention provides a composition of a regenerated aggregate, and the specific preparation process of the regenerated aggregate is as follows: Step 101: Pre-treatment of the asphalt planing material: before the asphalt planing material is sieved and cleaned, etc. Processing the program to obtain the bitumen planing fine particles, wherein the bitumen planing material is the asphalt paving surface which is removed from the road asphalt pavement, and usually the asphalt paving waste material will contain sand and stone materials of different thicknesses. Soil, foreign matter (such as paper scraps, garbage, etc.), so it is necessary to remove the soil and foreign matter through screening and cleaning, and then screen out the asphalt to remove fine particles. The particle size of the bitumen-grained fine-grained material is passed through the No. 4 mesh to the chassis, and is carried out by CNS 486 A3005 "Coarse fine-grain screening method". The detailed operation steps and the required soft and hard equipment are known. Technology, no further details here; Step 102, raw material mixing and kneading: the composition of the regenerated aggregate of the present invention, the raw material of which contains industrial inorganic sludge, cement, asphalt and fine a component such as a pellet, water and a chelating agent, and the above components are mixed and kneaded in a certain ratio to be thoroughly mixed; wherein, industrial inorganic sludge accounts for 50 to 70% by weight, and cement accounts for 7% by total weight of the raw material. ~18wt%, asphalt shaving fine particles accounted for 7~37wt%, water accounted for 2~4wt%, chelating agent accounted for 0.5~0.7wt%, in general, the amount (weight) of chelating agent is controlled by industrial inorganic sludge weight 1%, in addition, the amount of water is controlled by the water-to-binder ratio (W/B). In the present invention, the water-to-binder ratio is defined as (water + chelating agent) / (cement + whetstone + coal-fired fly ash) Here, the whetstone powder and the coal-fired fly ash are optional additions of the cerium, which will be described later in detail; wherein the aforementioned cement can use commercially available Portland Type I cement, the industrial inorganic sludge. It can be used for inorganic sludge recovered from various industrial wastewaters after treatment by a sewage treatment plant, such as waste water from a semiconductor fab or grinding wastewater in a ceramic factory, etc., because the industrial inorganic sludge may contain various heavy metal components ( Heavy metal species vary depending on the nature of the industrial wastewater), so a certain proportion of sequestration is added here. For combining with the heavy metal component to form a more stable compound to avoid heavy metal release from the recycled aggregate material prepared in the future; Step 103, compression molding granulation: filling the raw material obtained in step 102 into a cylindrical test In the body mold, the number of the test body is given, and the sample is dried and hardened for a period of time after the sample is left to be demoulded. The sample after the mold removal is the recycled aggregate of the present invention; Step 104, the finished product is cured: the mold is removed The subsequent specimens are placed in a maintenance box and cured according to the method specified in CNS 1230 "Concrete specimens in the laboratory molding and curing method", and then subjected to a compression test machine for 1 day and 3 days respectively. The uniaxial compression test is carried out to verify the engineering properties of the regenerated aggregate; the various specimens (recycled aggregates) prepared according to the ratio range disclosed in the step 102 of the present invention have been tested and proved to be remarkable. Improve the compressive strength of CLSM. The experimental data is shown in Table 1 below:

In Table 1, the test body 1 does not contain asphalt and fine particles, and it is used as a control group. It can be seen from Table 1 that under the control of the fixed water-to-binder ratio, even if the amount of cement is slightly lowered, it is only necessary to adjust The ratio of the amount of asphalt removed from the recycled material to the industrial inorganic sludge can significantly increase the compressive strength of the recycled aggregate. Next, try to reduce the amount of cement and increase the amount of industrial inorganic sludge. When adding an appropriate amount of bitumen to remove fine particles, the recycled aggregate can have a certain and stable compressive strength. The experimental data is shown in Table 2 below:

Comparing the test body 5 of Table 2 with the test bodies 3 and 4 of Table 1, it can be found that while maintaining the amount of industrial inorganic sludge in a relatively high-grade state, the amount of cement is simultaneously reduced, as long as the asphalt of the same recycled material is increased. By removing the amount of fine aggregates, the recycled aggregate of the present invention can maintain a certain compressive strength (engineering acceptable strength), which proves that the added asphalt of the present invention can reduce or even offset the regeneration. The negative effect of the concrete aggregate due to the reduction of the cement content against the compressive strength; as another preferred embodiment of the present invention, in the step 102, the present invention may further selectively add one or two kinds of materials to the raw material. Preferably, the blending system is whetstone powder or coal-fired fly ash, wherein the ston furnace powder accounts for at most 7% by weight based on the total weight of the raw materials, and the coal-fired fly ash accounts for at most 9 wt%, usually, adding Buzuo 岚 岚 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜 卜The amount of mud can be found that the strength does not necessarily deteriorate. This proves that the asphalt chipping fine particles will not cause negative or adverse effects on cement materials other than cement. The experimental data are shown in Table 3 below:

Under the condition of fixing the water-binder ratio, even if the content of the ston furnace powder, the coal-fired fly ash or the ratio of the substitute cement is increased, the recycled aggregate material of the invention can still maintain a certain level by increasing the content of the asphalt-cut fine-grained material. The compressive strength, in order to achieve the effect of reducing costs and balancing the nature of the project, the experimental data is shown in Table 4 below:

By using the chelating agent, the present invention can fully utilize the recovered industrial inorganic sludge as a component of the regenerated aggregate without worrying about the outflow of heavy metal components, and at the same time, by adding the asphalt obtained by the recovered asphalt shavings. In the range of composition ratios disclosed, the ratio of the recycled material to the cement is not in a unidirectional inverse relationship with the compressive strength of the recycled aggregate, so that the amount of recycled materials can be used by engineers. And the greater the flexibility of the strength of the recycled concrete aggregate, and at the same time can create the largest decontamination pipeline and way for the industrial inorganic sludge and asphalt planing materials, so that the invention can achieve a better economy. With environmental benefits.

The detailed description of the preferred embodiments of the present invention is not intended to limit the scope of the present invention, but without departing from the spirit of the invention. Equivalent implementations or changes shall be included in the scope of the patent in this case.

Claims (7)

The composition of the recycled aggregate material is obtained by mixing and kneading the components in the raw material and mixing them thoroughly. The raw material comprises: 50~70% by weight of industrial inorganic sludge, 7~ by weight of the total raw materials. 18 wt% of cement, 7 to 37 wt% of bitumen, fine particles, 2 to 4 wt% of water, and 0.5 to 0.7 wt% of a chelating agent. The composition of the regenerated aggregate according to claim 1, wherein the particle size of the bitumen fine particle is passed below the No. 4 mesh to the chassis. The composition of the regenerated aggregate according to claim 1, wherein the cement is Portland Type I cement. The composition of the regenerated aggregate according to claim 1, wherein the chelating agent is used in an amount of 1% by weight based on the weight of the industrial inorganic sludge. The composition of the regenerated aggregate according to any one of claims 1 to 4, wherein the raw material further comprises one or two kinds of cerium admixture. The composition of the regenerated aggregate according to claim 5, wherein the slag is a whetstone or a coal-fired fly ash. The composition of the regenerated aggregate according to claim 6, wherein the grit powder has a content of at most 7 wt% and the coal fly ash content is at most 9 wt%, based on the total weight of the raw material.