SE458451B - Road lining of low viscosity filler - Google Patents

Abstract

Material has a particle size smaller than 1 mm and comprises 15-25% cement and 85-75% fly ash, possibly with up to 80 Kg fine sand per 100 kg of cement flyash mixture and/or other fine materials e.g. slag, air bubbles for higher front resistance, water reducing materials etc. There fill cavities and stabilise the macadam layer.

Description

458 451 2 _ quite large as a composition of 1: 3 - 1: 4 needs to be used to give satisfactory results.

In our pending Swedish patent application 8405344-6, a filling mass is described for refilling excavations. ground cover and the like consisting of cement. fly ash, water. air and foaming agents. This pulp is very cheap as it is mostly based on a waste material. fly ash, which is produced in very large quantities at oil-fired heating plants. For fillers, you want a mixture that is hard enough. soft enough not to crack and hard enough to provide satisfactory durability. and similar claims are placed on an efficient base bearing.

For the base layer according to the invention, we want to activate all fly ash according to the same principle as when we manufacture concrete containing cement and fly ash, and we now want to make the product very easy to flow so that it can penetrate into the macadam with quite little vibration. We achieve the hardness and hardening by adding so much cement or lime that all the pozzolanicity of the ash is utilized. Such a mixture contains 15 - 25 S cement and 85_- 75 X fly ash from firing with coal. peat. oil. etc.

We achieve the flowability by using normal concrete additives that are strongly water-reducing and by reducing the largest particle size by at least one ten power from 8 mm to less than 1 mn. The normal fly ash has an average particle size of about 0.1 mm. of cement and fly ash can be used as such a mixture of grout in macadam. but the mixture can be further improved and the cost reduced by adding fine sand to the cement-fly-ash mixture. Finsand we have a large surplus of here. as finšand has always been discarded during road construction. Depending on the quality of the sand, 0 - 80 t can be added calculated on the total binder weight, ie. cement or lime and fly ash. i | 458 451 In some cases it may also be necessary to achieve high frost resistance of the material, which can be done in the usual way with the addition of foaming agents.

Base layers of the type cement-bound macadam according to the invention have better properties than previously used base layers at a considerably lower cost. For the most expensive alternative according to the invention, only half as much cement is needed, as a result of which our cement-used macadam becomes economically competitive. The cost can also be further reduced and cement consumption reduced by mixing fine sand and other waste materials. Due to the improved flowability of our pulp, the processing costs for the laying are significantly reduced. and despite reduced vibration, the filling of the cavities in the macadam is still improved.

Claims (1)

1. 458 451 10 Patent claims ____________.