Polymer mortars

Polymers for Advanced Technologies 6, No. 11, Nov. 1995, p.688-92 MAKING POLYMER CONCRETE AND POLYMER MORTAR USING SYNTHESISED UNSATURATED POLYESTER RESINS FROM POLY(ETHYLENE TEREPHTHALATE) WASTE Abdel-Azim A AA Attia IA Egyptian Petroleum Research Institute Carro,Ain Shams University... 

MECHANICAL PROPERTIES OF POLYMER MORTAR MADE FROM RECYCLED PET-BASED UNSATURATED POLYESTER... 

Keywords mechanical properties, polymer mortar, unsaturated polyester resin, recycled PET, degree of unsaturation, glass transition temperature. 

PET is useful polymer used for fiber, film, and plastic containers such as carbonated beverage bottles. Recently, the recycling of polymers such as PET after use is attracting the attention of many researchers aware of environmental problems and wishing to find ways to save earth resources. Previous studies showed that unsaturated polyester resins can be economically prepared from recycled PET and the resins may be useful for resin concretes (1 4). However, there is little information on the molecular features of the UPE resins. Thus, we synthesized various UPE resins from PET. Especially, the PET content, chain flexibility and degree of unsaturation of the resins were systematically varied and the effects of those variables on the mechanical properties of the cured resins and polymer mortars made therefrom were studied. 

Various UPE resins based on recycled poly ethylene terephthalate(PET) were prepared and the properties of the polymer mortar made with the UPE as well as those of the cured resin itself were investigated. It was found that degree of unsaturation of the resins was the most important property affecting thermal and mechanical properties of the cured resin and PM. The cured unsaturated polyester resin or polymer mortar made from resins of higher unsaturation, i.e., less PET content or adipic acid content in the resin, showed higher glass transition temperatures,... 

R.Letsch (1987). Polymer Mortar Overlays—Measurement of Stresses. Proceedings of the Fifth International Congress on Polymers in Concrete, Brighton, England, pp. 119-123. 

Recycled Polymer Mortar from Recycled Polyurethane and Polyster (RPUMRPE) [4]... 

Typical properties of RPUMRPE mortar in comparison to the hybrid recycled polyester (HRPE) mortar and recycled polyester (RPE) are presented in Table 6. The HRPE is hybrid polymer of recycled polyester and polyurethane which comes from F2 hybrid resin part A made by Amoco. The RPE is recycled polyester made by Alpha corporation. The bond, tensile and compressive strength, modulus of elasticity and shrinkage of these three kinds of polymer mortar were measured at 4, 8, 12, and 24 hours respectively. 

According to the ASTM C-884-78, delamination of the polymer mortar layer from the concrete test block or the presence of horizontal cracks in the concrete near the interface shall constitute failure. It is obvious from these results that the RPUMRPE mortar passes the ASTM C-884-78. After thermal cycling, no delamination was found in the specimens. The failure in all specimens in the shear and pull out tests occurred within the portland cement concrete substrate. These results depended on the tensile strength of the concrete substrate. 

Table 6. The Comparison of Main Properties of Three Polymer Mortar Within 24 hrs.

Several overlays from 0.5 to 1.0 inch (12 to 25 mm) in thickness were cast on beams from 16 to 65 inches (406 to 1650 mm) long for each polymer mortar. Three polymers mortars, RPUMRPE, HRPE, and RPE, were tested. They were demolded after one day, and it was found that RPUMRPE and HRPE overlays showed no delamination, but the recycled polyester (RPE) developed a 0.5-1-mm crack at the interface of the overlay and beam. After 3 months, the RPE overlay separated from the beam. In contrast, the RPUMRPE and HRPE overlays performed well. Two... 

The recovered glassfiber-resin powder was tested as a filler for polymer mortars[3]. The mortars were composed of filler, silica sand and binder, dried for one day, and cured at 70°C for 15 hrs. A glassfiber-resin powder and a calcium carbonate powder for comparison (each with an average size of 52 // m) were used as fillers. Bisphenol F type epoxy resin, poly methacrylic methyl (PMMA), and unsaturated polyester (UP) were used as binders. 

As Figure 5 shows, the strength properties with the glassfiber-resin powder were nearly equivalent to that produced by addition of the calcium carbonate and proved to be satisfactory for the use as a filler for polymer mortars. 

Fig. 5. Strength properties of polymer mortar containing glassfiber-resin...

When sand is used as a filler, the composite is referred to as a polymer mortar. Other fillers include crushed stone, gravel, limestone, chalk, condensed silica fume (silica flour, silica dust), granite, quartz, clay, expanded glass, and metallic fillers. Generally, any dry, nonabsorbent, solid material can be used as filler [4],... 

Non-alkaline (polymer) mortars have been used for repairs however, they do not promote repassivation and they are only based on physical effects. Epoj mortors applied as patch repairs have in the past been unsuc-... 

---