Manufacture of Protein Energy-saving Slab with Rapid-hardening-sulphoaluminate Cement
|Keywords||rapid-hardening-sulphoaluminate cement protein foaming agentfoam concrete protein energy-saving slab|
With the rapid development of the building industry, the quality and environmental problems of building materials are taken more seriously by government and other industries. The main object of study is manufacturing a new kind of energy-saving slab which is made of protein foaming agent and rapid-hardening-sulphoaluminate cement as the main gelatinization material. The essence of this new kind of protein energy-saving slab belongs to foam concrete which has many kinds of advantages, such as light weight, insulation, heat insulation, sound insulation, fire resistance. This kind of building material can replace the existing polystyrene particle foam slab which is flammable and decomposed difficultly.The protein foaming agent used in the preparation of the protein energy-saving slab is first researched. Results show that7.6g protein foam agent added500ml water is stirred in60minutes (record the results of every10min), scope of the foam volume turns to be3800～8000ml and the time of foam leaking water is237mins, if7.6g foam is added to250ml water and stirred in60minutes (record the results every10min). Scope of the foam volume turns to be3500-7500ml and the time of foam leaking water gets to1350mins, results show that the foam volume of1g protein foaming agent is300～1200ml, and consumption of water can not affect the foaming ability of the foaming agent, but can affect the time of leaking water. As a conclusion, the more water is used, the shorter the time of leaking water is. And the longer time stirred, the larger foam volume gained.In experiments which foam concrete specimens are made from200g rapid-hardening-sulphoaluminate cement the best suitable foam agent dosage is0.4g. In the experimental study of select the foaming agent status. Foam concrete specimens which foam and cement are mixed directly appear collapse of cement thick liquid. So in the practical application, the solid powder foaming agent is considered firstly because it is easier to operate than the solution state. When cement thick liquid was mixed with fly ash and sand, the water absorption rate of the foam concrete specimen increases and can not demould completely. When cement thick liquid was only mixed with sand the foam concrete is such uneven that density and strength of upper levels is higher than lower and compressive strength can not shows regular pattern.To improve the compressive strength and reduce the demoulding time, CaCl2、 Na2SO4and alcohol are added in the process of making foam concrete as regular water reducing agent. Results show water reducing agent can reduce5ml of water consumption when200g cement mixed into cement thick liquid. While CaCl2is used as water reducing agent the demoulding time increases280mins and rate of water consumption increases8%, while Na2SO4the demoulding time reduces185mins and rate of water consumption increases38%, and while the alcohol the demoulding time increases150mins and rate of water consumption increases31%. The accession of three kinds of water reducing agent makes the compressive strength decrease of the foam concrete. So three kind of water reducing agent are not suitable in the practical application. When accelerating solidification agent is added in the foam concrete, demoulding time of specimen can be shorten110mins, but there is a slight increase of6%in the water absorption and the compressive strength of the specimen is less than1.38MPa,(2KN). So use of the accelerating agent is considered carefully according to the actual situation. In experiment of affect of temperature on foam concrete.results show the temperature affect the demoulding time obviously. At the same time, according to the analysis by SPSS statistical software the demoulding time of foam concrete is significant difference in winter and summer.Based on the above parameters the experiment is amplified in the factory. The results show that the use amount rate of cement in the factory is larger than in the laboratory, but rate of water consumption, stirring time, and demoulding time is the same as laboratory. So the formula is gained that compose of700kg of rapid-hardening-sulphoaluminate cement,1.4kg of protein powder foaming agent and441L of water. The density of protein energy-saving slab produced is760kg/m3, and quotas reach the industry standards.