Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Akzo Nobel NV filed Critical Akzo Nobel NV Priority to US09/812,318 priority Critical patent/US6540822B2/en Assigned to AKZO NOBEL N.V. Original Assignee Akzo Nobel NV Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Julia Wates Alan James Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US09/812,318 Other versions US6540822B2
#SS 1H ASPHALT EMULSION PDF#
Google Patents Polybetaines as asphalt emulsifiersĭownload PDF Info Publication number US20020183401A1 US20020183401A1 US09/812,318 US81231801A US2002183401A1 US 20020183401 A1 US20020183401 A1 US 20020183401A1 US 81231801 A US81231801 A US 81231801A US 2002183401 A1 US2002183401 A1 US 2002183401A1 Authority US United States Prior art keywords hydroxides emulsion polybetaine polyamine trimethylenedi Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US20020183401A1 - Polybetaines as asphalt emulsifiers The transition can be made successfully, but it needs to be handled carefully by knowledgeable and experienced operators.US20020183401A1 - Polybetaines as asphalt emulsifiers Using storage tanks and distributors that have previously contained emulsions creates a potentially dangerous situation when converting over to hot applied aphalt products. It will be more expensive than asphalt emulsions and spraying hot asphalt has some safety disadvantage. This material can work very well as a binder. The material will need to be heated to 275☏ to 325☏ or 135☌ to 163☌. Hot applied asphalts can be used and sprayed as a bond coat. Some research has shown that cutbacks achieve lower bond strength than other materials. Some states do not allow the use of cutbacks. They will be more expensive per gallon than emulsions and have some environmental disadvantages. Cutbacks are still used as bond coats in some circumstances and some locations. They will work in conditions that might not suit standard emulsions, like poor weather.
The emulsion has very good bond strength so it is very difficult to use without the spray paver technology.Ī cutback is a combination of a base asphalt and a cutter stock that dilutes the asphalt so it can be used as a construction material. PMAE emulsions are typically used with spray pavers. PMAE stands for Polymer-modified asphalt emulsions. The variants typically seen are RS-1, RS-2, CRS-1, and CRS-2. RS and CRS are designed to break faster than CSS & SS emulsions. The "RS" in the name designates this as a rapid setting emulsion. These are slow setting emulsions and are popular because they are forgiving and easy to use. Some of the distresses created by improper bonding include shoving, fatigue cracking, rutting, and longitudinal wheel path cracking.īy far, the most common bond coat emulsions are SS-1, SS-1h, CSS-1, and CSS-1h. If the bond coat material is an emulsion, it should have time to break before the hot mix is applied. Inadequate bonding between the layers will greatly reduce pavement life. Care must be taken to ensure that the distributor bar is set at the appropriate height to develop proper spray overlap and that the spray bar nozzles are identical, the correct size, and at the proper angle. It is critical that the correct rate of bond coat is applied and that it is uniformly applied across the entire base surface. After cleaning, an asphalt distributor sprays a thin coat of bituminous liquid.It is important that the base surface is clean and dry. Generally the base surface is prepared by a through brooming, sometimes an older layer of asphalt may be removed by milling which can create a significant amount of debris.The purpose of the bond coat is to adhere the pavement layers together so they act as single unit and not as independent layers.
A Bond Coat is a thin coating of bituminous liquid asphalt sprayed between an existing pavement surface and a hot-mix overlay.
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