Ronafix Products for Polymer Modified Levelling and Wearing Screeds
Ronafix admixture is used in screeds, bedding mortars, weather resistant renders, tanking renders and concrete repairs. The use of Ronafix admixture in sand/ cement screeds improves development of physical properties throughout the curing period, allowing pedestrian access after 24 hours and vehicle traffic after 2-3 days at 200C. In the longer term, testing of heat aged samples indicates that Ronafix screeds remain durable for more than 80 years. Tensile strength of unmodified control samples after simulated 20 years of ageing had reduced to ˂ 1N/mm2 and had become unmeasurably low after simulated 80 years ageing, but tensile strength of Ronafix modified samples remained higher than the original strength of unmodified control samples. Flexural strength of Ronafix modified samples was unaffected by 80 years of heat ageing but a gradual reduction was seen in the unmodified sample and flexural strength was reduced by approximately 29% between 20 years and 80 years of ageing. The addition of Ronafix admixture to sand/ cement mixtures considerably increases flexural and tensile strengths and the reduced water cement ratio of Ronafix modified mortars will in many cases improve compressive strength. Increased physical properties allow Ronafix screeds to be laid thinner than conventional screeds. Water and water vapour permeability of Ronafix modified mortars is low or extremely low, depending on the mix design used, making Ronafix modified screeds highly resistant to frost damage. Typical shrinkage of Ronafix Mix A screed and its prepacked equivalent is 0.01%, similar to that of epoxy resins. Typical shrinkage of Ronafix Mix A1, Mix F and Mix B1 screeds and pre-packed equivalents is 0.02%, considerably lower than unmodified screeds. Ronafix modified screeds applied at 50mm thickness are sufficiently dry for application of resin floorings and waterproof membranes, resilient floorings, carpet, quarry tiles, ceramic tiles and stone tiles after approximately 10 days of air curing when cured at 200C and approximately 60-65% relative humidity. At 15mm thickness in the same conditions, Ronafix polymer modified screed will typically dry after 3 days air curing.