System and method for making and applying a non-Portland cement-based material

Abstract

A system and method for applying a construction material is provided. The method may include mixing blast furnace slag material, geopolymer material, alkali-based powder, and sand at a batching and mixing device to generate a non-Portland cement-based material. The method may also include transporting the non-Portland cement-based material from the mixing device, through a conduit to a nozzle and combining the transported non-Portland cement-based material with liquid at the nozzle to generate a partially liquefied non-Portland cement-based material. The method may further include pneumatically applying the partially liquefied non-Portland cement-based material to a surface.

Claims

1. A system for applying a construction material comprising: a batching and mixing device associated with a mobile batching and mixing vehicle, the batching and mixing device configured to mix blast furnace slag material, geopolymer material including non-pumice-based volcano rock flour, alkali-based powder, and sand to generate a non-Portland cement-based material, wherein the components of the non-Portland cement-based material have a Blaine fineness value of approximately 2500-5000 cm.sup.2/g; a delivery mechanism affixed to the batching and mixing device configured to transport the non-Portland cement-based material from the batching and mixing device to a portable container associated with a portable gun; and a hose configured to transport the non-Portland cement-based material from the portable container to a handheld nozzle, wherein the handheld nozzle is configured to receive the non-Portland cement-based material and combine the transported non-Portland cement-based material with liquid to generate a partially liquefied non-Portland cement-based material, wherein the nozzle is further configured to pneumatically apply the partially liquefied non-Portland cement-based material to a surface.

2. The system of claim 1, wherein the alkali-based powder includes silicate.

3. The system of claim 1, wherein batching and mixing is performed as at least one of a dry-mix and a wet-mix.

4. The system of claim 1, wherein the non-Portland cement-based material is inorganic.

5. The system of claim 1, wherein the non-Portland cement-based material includes at least one of clay, gneiss, granite, liparite, andesite, picrite, potassic feldspar, albite, pumice and zeolite.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a side view of a mobile system configured to batch, mix and apply a non-cement-based material according to an embodiment of the present disclosure;

(2) FIG. 2 is a side rear view of a mobile system configured to batch, mix and apply a non-cement-based material according to an embodiment of the present disclosure; and

(3) FIG. 3 is a flowchart depicting operations consistent with a non-cement-based application process according to an embodiment of the present disclosure.

(4) Like reference symbols in the various drawings may indicate like elements.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(5) Embodiments of the present disclosure are directed towards a construction material having an alkali-activated binder (i.e. non-Portland cement based) and a system and method for making and applying the same. Although many of the examples included herein are discussed in the context of concrete rehabilitation it should be noted that the construction material described herein may be used in any suitable application. Some of these may include, but are not limited to, sewer rehabilitation projects, any concrete structure undergoing an acid attack, etc.

(6) Referring to FIG. 1, there is shown a mobile batching and mixing vehicle 100 having a number of containers, compartments, and devices associated therewith. In some embodiments, vehicle 100 may include first container 102, which may be configured to store sand or other materials. Storage unit 104 may be configured to store water or other liquids. Vehicle 100 may further include a batching and mixing device 106, which may include a number of components, some of which may include, but are not limited to, second container 108, adjustable delivery mechanism 110, and portable gun 212. As is shown in FIG. 2, portable gun 212 may be connected to nozzle 214 via conduit or hose 216.

(7) In some embodiments, mobile batching and mixing vehicle 100 may be configured to batch, mix and apply a non-Portland cement-based construction material. This material may be batched and mixed at the vehicle (e.g. within batching and mixing device 106) or prior to being placed within second container 108. This material may be transported to nozzle 214, where it may be mixed with liquid from storage unit 104, prior to being applied to the surface in need of construction OR repair. The specifics of the non-Portland cement based construction material are discussed in further detail herein below.

(8) In some embodiments, the non-Portland cement based construction material described herein may have better strength values as compared to existing materials, a high resistance and no reactivity versus inorganic and organic acids and additionally high early strength values. The material may include a dry mix of blast furnace slag material, geopolymer material, alkali-based powder, and sand at a batching and mixing device to generate the non-Portland cement-based material.

(9) In some embodiments, the non-Portland cement based construction material may include various types of geopolymer material. Some of these may include, but are not limited to, pozzolanic material, which may react with strong alkali and mixing that blend with the sand and/or grit. In some embodiments, the pozzolanic material may include active silicates like slag sand or fly ash. Natural material like volcano rocks or some others may also be used, however, these may be more desirable if used in smaller portions as very fine powder. The term “fly ash” as used herein may refer to an unnatural pozzolan.

(10) In some embodiments, the non-Portland cement based construction material may include any number of pozzolanic materials, some of which may include, but are not limited to finely ground clay, gneiss, granite, liparite, andesite, picrite, potassic feldspar, albite, pumice, zeolite, etc., as well as mixtures thereof. These materials may be used in a ground form, calcinated and/or noncalcinated. Additionally and/or alternatively, all raw materials containing sufficient amounts of reactive (e.g., metastable, vitreous) SiO.sub.2 and Al.sub.2O.sub.3, including, but not limited to, ashes, pozzolans, slags may also be suitable for embodiments of the present disclosure.

(11) In some embodiments, the non-Portland cement based construction material may include an alkali-based powder material and/or various mixing liquids. Some possible mixing liquids may include, but are not limited to, potassium and sodium water glass, alkali hydroxides, etc.

(12) In some embodiments, the reaction between the SiO.sub.2/Al.sub.2O.sub.3 containing components and the alkaline mixing liquid may result in alumino-silicates having a tridimensional structure. These framework structures allow for the creation of a construction material requiring no Portland cement in the compound.

(13) In operation, the ingredients may be thoroughly batched and mixed (e.g., wholly or partially at vehicle 100) and then delivered to portable gun 212. The non-Portland cement based construction material may be carried via compressed air through the conduit 216 to nozzle 214. In one particular embodiment, potassium silicate, solid content 48%, density 1.52 g/cm3, Wt SiO2:K2O 1.14, and some liquid may be added and thoroughly mixed inside nozzle 214 in a short period of time (e.g., less than 1 second) before the partially liquefied mixture may be pneumatically applied to the surface of interest.

(14) Embodiments included herein may include a mixture containing some or all of the following: slag (e.g., unnatural pozzolan, basis), fly ash (e.g., unnatural pozzolan and optional in the recipe), geopolymer (e.g., natural pozzolan and optional, ground vulcano material), alkali (e.g., powder or liquid), other liquids, including water (optional), and sand/grit. Examples of specific mixtures are provided below, however, it should be noted that the specific mixtures provided herein are included merely by way of example. Numerous additional and alternative embodiments are also within the scope of the present disclosure.

(15) In one particular example, the non-Portland cement based construction material may be comprised of the following mixture:

(16) TABLE-US-00001 TABLE 1   1 part ground granulated blast furnace slag 0.13 parts volcano rock flour (alternatively fly ash or a mixture) 0.61 parts potassium silicate, Wt 1.14 1.35 parts of sand and/or grit

(17) In some embodiments, the components of the mixture may have a Blaine fineness of approximately 2500-5000 cm2/g.

(18) In another example, the non-Portland cement based construction material may be comprised of the following mixture:

(19) TABLE-US-00002 TABLE 2 Parts Blast furnace slag 0.5-1   Fly Ash   0-0.5 Pozzolanic   0-0.5 Sand/grit 1-2 Potassium or sodium silicate liquid or 0.2-2   powder (wt 1.0-3.5)

(20) In another example, the non-Portland cement based construction material may be comprised of the following mixture:

(21) TABLE-US-00003 TABLE 3 Recipe 1 Recipe 2 Recipe 3 parts parts parts Blast Furnace Slag 1 1 1 GGBS Fly ash 0.2 0.2 0.1 Pozzolona 0.2 0.3 volcano ash Pozzolona 0.2 Pumice grinded Dry sodium silicate 0.7 Wt 2.1, Na2O 27.5% Potassium silicate 0.6 0.6 SC 52%, density 1.65 g/cm3, Wt 1 Sand 1.35 1.35 1.35 Water 0.55

(22) Embodiments of the non-Portland cement based construction material produced an unanticipated result as the reaction time of the alkaline ingredients with the rock flour was sufficient to generate a sticky compound. Through numerous tests, this compound was found to adhere extremely well on a vertical surface, builds a tight bonding and hardens within 3 days with compressive strength values above 50 N/mm2 (8000 psi).

(23) The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

(24) The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the disclosure. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

(25) Having thus described the disclosure of the present application in detail and by reference to embodiments thereof, it will be apparent that modifications and variations are possible without departing from the scope of the disclosure defined in the appended claims.