FIELD OF THE INVENTION
The invention relates to cement, particularly cement that develops strength rapidly for patching or repairing cementitious surfaces or structures.
BACKGROUND OF THE INVENTION
There are many situations which require cement structure to be repaired. Most notably, roadways frequently wear and degrade resulting in holes, cracks, etc.
One problem with some cement repair formulas is that they take too long to develop sufficient strength to permit resumed use of the cement structure. This can be a major problem if the cement structure is, for example, a heavily traveled road.
Rapid setting formulas have been used in the past. However, these formulas suffer from a variety of problems. For example, rapid setting cement formulas sometimes use ammonium phosphate which produces noxious ammonia gas when mixed.
Some cement formulas set too fast, allowing insufficient time to work the material into the desired location and form.
Improved cement formulations provide modern, all season, repair and anchoring materials in a single component, inorganic, high performance cement. Exemplary cement formulas adhere to concrete, masonry, metal, asphalt, and to itself, without theneed of a bonding agent and may be used both inside and outside and in hot and cold temperatures.
The described formulas have been formulated for repair and anchoring of work that requires exceptional bonding, adhesion and strength. The formulas have been designed for jobs where availability of working time for the repair is limited or “downtime” must be minimized.
A preferred formulation is shown below:
TABLE-US-00001 Neat Cement Formula: Hardburnt, high purity Magnesia (MgO) 30.0% Anhydrous Mono Potassium Phosphate 24.0% Mono Ammonium Phosphate 6.0% Fly Ash F 40.4% 100%
TABLE-US-00002 Blended Cement ready to use: Hardburnt, high purity Magnesia (MgO) 12.4% Anhydrous Mono Potassium Phosphate 10.0% Mono Ammonium Phosphate 2.5% Fly Ash F 16.5% Silica Sand 16 mesh 29.3% Silica Sand 30 mesh 29.3% 100%
The total phosphate, including mono potassium phosphate (MKP) and mono ammonium phosphate (MAP), may be selected in the approximate range of 10% to 45% (w/w) of the total neat formula (excluding sand and water). For some applications the totalphosphate amount should be in the range of 25% to 35% of the total neat formula.
The total phosphate component may be a mixture of MKP and MAP. MAP is important for increasing the reaction speed, providing faster setting and strength development. However, the MAP component should be minimized to avoid noxious ammonia odors. Preferably the MAP component is selected from the approximate range of 2% to 20% of the total neat formula. For some applications the MAP component should be in the range of 2% to 10%.
The following factors may affect the formulation. A formula incorporating MKP without MAP may be too slow to set (up to 45 minutes); and may show slow strength gain and low ultimate strength and low exotherm. Low amounts of MAP in addition toMKP showed surprising large gains in set speed and rapid strength development. High amounts of MAP, however, may cause the cement to set too fast and may produce an objectionable ammonia odor.
Another factor is the cost of MKP, which is much higher than MAP. This may influence the amount of MKP used. With MKP it is possible to use lower %’s of a higher purity MgO, the next most costly ingredient, and we can use higher amounts of FAF,the least costly ingredient. Also, since FAF is considered a waste material, using higher %’s contributes to the “green” (environmental) nature of the cement.
Advantages of improved cement formula, known as “Tectonite™ Cement” follow. Tectonite™ Cement allows the user sufficient working time (approximately 15 minutes at 72 F) without compromising high early strength development (approximately3,000 psi in 30 minutes and 4,000 psi in 60 minutes). Tectonite™ Cement has a uniform color that cures closely to the color of Portland cement concrete. Tectonite™ Cement is smooth in texture in order to allow feathering in cosmetic repairs,while maintaining strength in structural repairs (minimum 1/4” thickness). Tectonite™ Cement requires less water than prior formulas. It is recommended that a ratio of 6 parts cement to 1 part water be used. The water cement mixture should bebarely pourable. Water in excess of the recommended amount will weaken the cement’s ultimate strength.
In cold weather applications it is recommended that for best results the repair area should be warmed as well as using warm mixing water.
High Strength–Tectonite™ achieves, in around a half an hour, compressive strengths attained by ordinary Portland cement in 28 days.
Fast Set–Tectonite™ sets in about 15 minutes (at 72 F) from the time of hydration and is traffic ready in about thirty minutes.
Tenacious Bond–Tectonite™ achieves, at a fraction of the cost of complicated epoxy cements, a chemical bond with materials to which it is applied.
Some Recommended Uses
TABLE-US-00003 High Traffic Areas Roadways – Concrete & Asphalt (Easy color matching) Potholes, Curbs, Sidewalks, Culverts, Pits, and Truck Docks Bridges, Irrigation Structures, Tanks & Dams Walls, Seawalls, Runways, Aprons & Parking StructuresSteps, Floors & Corridors Spillways & Platforms Subject to High/Low Temperatures Irregular Repairs – Fast set often allows for hand held forms. Broken Corners Chipped Steps & Abutments Cracked and Spalled Areas Free Form Contour Repair Concave/ConvexSurfaces Difficult Verticals & Angles Anchoring & Re-Anchoring Iron & Steel Anchoring Easy Cleanup Competitive with fast epoxies, less expensive Guy Wires – Poles & Posts Signs – Parking Meters Bolts – Frames & Rails Hand rails Machinery Bases
Tectonite™ is fast setting. In hot weather, cold components will retard set time. In cold weather, warm components will accelerate set time. In normal temperatures (70 75 F), allow no more than 15 minutes for hydrating, mixing, placing,and finishing. Add only enough water to create a thick, barely pourable, mixture in accordance with recommendations. Prior to mixing large volumes, mix a cup-sized quantity to get a “feel” for consistency and set time. Store in a dry place. Moistureand/or high humidity will affect performance and reduce the one-year shelf life.
Area(s) to be repaired must be clean. Remove standing water. For best results, product should not be used for patches less than 1/4 inch deep; for deep repairs, 3/8 inch non-calcareous aggregate at rate of 20 25 lbs. per 60 lbs. of cement maybe added. Apply in multiple layers, allowing cement to cool between pours. In warm weather (80 110 F.°), cool repair area with cold water; in cold weather (30 45 F.°), heat repair area until warm to the touch. No moist cure is required. Air cure and protect from inclement weather until final set.
It is recommended that a ratio of 6 parts cement to 1 part water be used, in order to produce a mix that is just barely pourable. Water in excess of the recommended amount may weaken the cement’s ultimate strength.
TABLE-US-00004 ASTM C 109-93 Compressive 2,787 PSI (19.2)/4,025 Strength PSI. PSI (27.8)/ 30 Minutes/1 Hour/28 days 6,500 PSI (44.8) ASTM C 157, ASTM C 928-92a -0.002%, -0.007% Length Change 28 Day Dry, 28 Day Wet ASTM C 78-84 Flexural Strength576 PSI (4.0), 626 PSI 1 Hour, 1 Day, 28 Days (4.3), 760 PSI (5.2) ASTM C 882-87 Bond Strength with Portland Cement 1 Day-Portland Cement Failed, Bond Held 2,000 PSI (13.8) 7 Day-Portland Cement Failed, Bond Held 2,213 PSI (15.3) ASTM 666-90 Freeze/ThawResistance Freeze-thaw durable 300 cycles ( ) = MPa
TABLE-US-00005 Section I – Material Identification Trade/Material Name: Tectonite ™ (SF) Cement Description: Magnesium Oxyphosphate Cement Other Designations: Magnesium Oxide (Mag-Ox) CAS: None assigned Chemical Name: Magnesium OxyphosphateCement Manufacturer: Tectonics International, per above
TABLE-US-00006 Section II – Ingredients and Hazards Exposure Limits CAS (Respirable Dust OHSA Ingredient Name Number Percent PEL) Dead burned 1309-48-4 25 40 10 mg/m3 magnesite Nitrogen 10101-89-0 5 12 5 mg/m3 Phosphate 7722-78-1 10 151 mg/m3 (AS P205) Phosphate (AS H3 7722-78-1 10 15 1 mg/m3 PO4) Crystalline Quartz 14808-60-1 50 75 .01 mg/m3 Fly Ash 68131-74-8 10 50 5 mg/m3
This material contains less than 1% free silica. The respirable dust Permissible Exposure Limit (“PEL”) for this material would be: 3.3 mg/M3 for total dust and 5 mg/M3 for respirable dust.
TABLE-US-00007 Section III – Physical Data Appearance & Odor Granular Gray powder – no odor Boiling Point & Evaporation Rate N/A Vapor Pressure N/A Specific Gravity, H2O = 1 3.20 3.40 Water Solubility (%) Nil Vapor Density, air = 1 N/AMelting Point >2,200° F. % Volatile by Volume 0
Comparison of new formula vs. old formula (“neat”) exotherms: (Note: Neat cement with sand will show a little slower set time and lower exotherm.)
The cement formulas that were compared are shown below:
TABLE-US-00008 Old Formula % MC-92 PV MgO 57 Agrium 11-52-0 26 MAP Pozzolanic NW FAF 17 100% New Formula % BayMag 96 SR MgO 30 Rotem 0-52-34 MKP 25 Agrium 11-52-0 MAP 5 Pozzolanic NW FAF 40 100%
TABLE-US-00009 Old Formula Time Temp. 0 71 F. 1 min. 71 F. 2 74 F. 3 78 F. 4 83 F. 5 88 F. 5.5 90 F. Set 6 94 F. 7 113 F. 8 122 F. 9 211 F. Max New Formula Time Temp. 0 71 F. 1 min. 71 F. 2 71 F. 3 74 F. 4 76 F. 5 79 F. 6 83 F. 7 86 F. 8 92 F. 9100 F. 10 114 F. 11 123 F. Set 12 135 F. 13 143 F. 14 154 F. 15 163 F. 16 173 F. 17 174 F. Max
The specific embodiments disclosed and illustrated herein should not be considered as limiting the scope of the invention, as understood by a person having ordinary skill in the art. Numerous variations are possible without falling outside thescope of the appended claims. The subject matter of the invention includes all novel and nonobvious combinations and subcombinations of the various elements, features, functions, and/or properties disclosed herein.