Grace Construction Products Bentoject Product Description Bentoject is the combination of a hydrophilic bentonite strip and a post-injectable injection tube into one system as a high performance waterstop for the sealing of construction joints in concrete. 1 2 3 Bentoject is composed out of 3 layers: 1. Reinforced spiral of steel wire on the inside prevents the collapse of the tube and hence blockage of the injection channel. 2. Filtering membrane between spiral wire and outer skin prevents the blocking of the injection channel and the swelling of the bentonite rubber towards the inside. 3. Bentonite rubber outer skin: This is the active part of the system and is made out of natural sodium bentonite and synthetic rubber. The outer skin will swell in contact with penetrating water and will thus seal the hair line cracks and small voids in the joint. Product Advantages Bentonite outer skin: Swells in contact with water to a maximum of 400%* of original dry volume. Does not dissolve in water and is non-polluting. Inner injectable tube: Can be injected at any time for localized leaks Can be injected with DeNeef polyurethane resins, acrylic resins, and micro-fine cements. Applications Bentoject is designed for the secure sealing of construction joints, cold joints and working joints in concrete, where there is a deficiency in the concrete work. The product is ideally suited for concrete construction with a limited wall thickness. Bentoject can also be used to replace combinations of two and more passive construction joint sealing systems. Properties Swelling capacity in contact with water Density Weight Maximum Expansion pressure Resistance against hydrostatic pressure Installation temperatures Operating temperatures Consumption during injection: Tensile Strength of steel coil: Properties of the outer skin: 400% of dry volume Approx. 1.48 g/cm 3 Approx. 0.102 lb/ft 101 psi 164 feet head 72 psi -15 C -60 C 5 F-140 F -45 C-120 C -49 F-248 F Properties of the injection tube: Test report KUL Univ. ASTM D71 Test report KUL Univ. Minimum 190 g/m to fill the tube (0.16 lbs/ft) Approx. 1800 N/mm 2 2.65x10 5 psi Note: The data shown above reflects typical results based on laboratory under controlled conditions. Reasonable variations from the data shown above may result. Packaging & Handling Bentoject Kit contains: 8 x 5m (16.4 ft) rolls per carton, 4m (13 ft) reinforced PVC-tube, 16 caps, 16 blue trumpets, 16 anchoring clips. Bentoject wire mesh is supplied in a pack containing 40 m (130 ft). Mesh opening: 10.6 x10.6 mm.
Bentoject should be stored under cover, clear of the ground. Protect the materials from all sources of moisture and frost. Shelf life is unlimited. Installation Guidelines Bentoject should preferably be installed on a smooth and dust-free surface. The product can be used under most weather conditions. However, installation during heavy rain or in prolonged contact with water can result in a premature swelling of the strip, which should be avoided. Bentoject can only function properly in a confined space, such that sufficient expansion pressure develops to assure waterproofing, without the necessity for post-injection. Bentoject must be in direct contact with the construction joint over its entire length, hence the necessity of using the Bentoject wire mesh profile. This profile must be gun nailed to the surface, minimum every 10 inches (use nails with washers). If the surface is very irregular, level the opening between the Bentoject and the substrate with SWELLSEAL WA or cementitious mortar. The Bentoject may be placed during the installation of the 2nd phase reinforcement bars, in between inner and outer rows of tie bars. Bentoject should be cut into lengths no longer than 5 m (16.4 ft). The ends should be prepared by cutting back the bentonite rubber skin by about 1.5 inches. The skin should be tapered at the end for easy installation of the trumpet. The blue trumpets slide over the injection tube until they are securely fixed in place. Installation: Step 1: Remove dust, dirt and loose parts by brushing firmly. Step 2: Level uneven and irregular surfaces with Swellseal WA or cementitious mortar. Step 3: Unroll the Bentoject (a concrete cover of 2.75 inches at all sides should always be respected). The roll ends should have a lateral overlapping of 2 to 4 in. The green ends need to be pressed together as well as possible. The PVC ends must protrude out of the concrete at accessible spots to facilitate future injection. The green part of the Bentoject tube may not protrude out of the concrete. Step 4: Place the wire mesh profile over Bentoject. Step 5: Fix the system by hammering or gun nailing (use nails with washer, approx. 1 every 10 inches). Injection: When water is infiltrating through the joint, DeNeef injection grouts or micro-fine cements are injected through the PVC ends left protruding from the concrete in Step 3 above. Inject after 28 days cure time.the injection fluid may be DeNeef Flex SLV PURe, an acrylate or a microfine cement.the maximum injection pressure is 14 bar (203 psi). When the length of the tube is too long, the pressure of injection at the entry side is too high and can damage the concrete.refer to DeNeef INJECTO Applicators Manual for more details. Health and Safety Always use protective clothing, gloves and goggles consistent with OSHA regulations during use. Avoid eye and skin contact. Do not ingest. Refer to Material Safety Data Sheet for detailed safety precautions. In the event of an EMERGENCY call: CHEMTREC 800-424-9300. Limitations Bentoject must be installed secure and flat in the joint such that the tube does not float up into the concrete pour. www.deneef.com Technical Service 1-800-732-0166 We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for the users consideration, investigation and verification, but we do not warrant the results to be obtained. Please read all statements, recommendations or suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation or suggestion is intended for any use which would infringe any patent or copyright. W. R. Grace & Co. Conn., 62 Whittemore Avenue, Cambridge, MA 02140. In Canada, Grace Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6. This product may be covered by patents or patents pending. DN-039 Printed in U.S.A. 12/11 FA/PDF Copyright 2011. W. R. Grace & Co. Conn.
1. Remove all dust, dirt and loose parts by brushingfirmly 2. When necessary, level uneven and irregular surfaces with Swellseal WA and let cure 1 hour before pouring concrete. 3. Assemble the Bentoject system. Cut away 1-1/2inches of the bentonite outer skin with a sharp knife. Be careful not to cut too deep or you will damage the internal membrane.
4. Clean up the surface of the internal membrane. Chamfer the edge with a twisting motion. 5. Install the blue trumpet onto the Bentoject with a screwing motion. The blue trumpet should sit tight onto the Bentoject injection tube. Make sure the bentonite outer skin is inside the conical part of the blue trumpet. 6. Unroll the Bentoject (a concrete cover of 2-3/4 inches at all sides should always be respected).the roll ends should have a lateral overlapping of 2 to 4inches; The green ends need to be pressed together as well as possible. In order to be able to inject at a later stage, the PVC ends have to protrude out of the concrete at well accessible spots.the green part of the Bentoject Tube may not protrude out of theconcrete. Make sure to have continuous contact with the surface.
7. Install the wire mesh profile over the Bentoject. 8. Fix the system by hammering or gun nailing (use nails with washer, approx. 1 per 10inches). Fix the PVC tube to the concrete with a nail and clip. 9. Make the overlap between 2 pieces of Bentojectaccording to the picture.