The Manufacture And Research Of Physical And Mechanical Properties About Lightweight And Insulating Concrete Block

Global energy situation is worsening and energy crisis has plagued countries all theway. In many forms of energy consumption building energy consumption has beenincreased year by year in the proportion of total energy consumption of our country.Therefore achieving building energy is urgent. If we want to make a low-energy building,energy-saving technologies should be applied to structural parts of the building envelopein which the wall take the highest proportion. Therefore, the development of materialabout new energy-saving wall is inevitable.In this study, we use lightweight and thermal insulation materials (ceramists, glazedhollow bead) to replace coarse aggregate and use industrial wasted feed (fly ash, mineralpowder) to replace part of cement by adding plant fiber and admixtures such as activatingagent and water reducing agent. In accordance with relevant mix design we developedlightweight and insulation concrete block. One hand the block can save energy and soil,utilize waste and improve building function, on the other hand it also have goodmechanical and thermal properties and meet the requirements of the relevant standards. Soits prospects are inestimable.Firstly, we take Na2SiO3as mineral admixtures so that we can develop the activatedaction of activator on fly ash and mineral powder. At the same time we research theactivated action of activator on fly ash and mineral powder as the percentage of activatoris3,4,5and6, and analysis the mechanism of reaction about the activated action. As theresult of the test we know that Na2SiO3can arouse the action of fly ash and mineralpowder effectively and improve the mechanical properties of cement-based materials. Andwe take subsequent trials as the percentage of Na2SiO3is5according to the analysis of thetests. The reason is that the block's flexural and compressive strength of7d and28d havebeen increased about35.25,8.82,7.89and4.89percents than the contrast.Secondly, we put different pretreatment ways on ceramics (wrapping graymechanically and artificially), mixing polymer (EP) as the volume percentage of ceramistis20,30and40. During the research we receive that mechanical wrapping make theblock's strength lower and artificial wrapping make it higher. Without EP block hasbetter mechanical property when the percentage of ceramist is30but block's mechanicalproperty has been improved best with EP when the percentage of ceramist is40. Thereason is that the block's compressive strength of7d and28d has been increased about11.51and10.77percent when the percent of ceramist is40. Thirdly, we use glazed hollow bead whose percentage is30,40and50to replacecoarse aggregate in the concrete and then design mixing ratio. Simultaneously we can alsomix in sisal fiber with1kg/m3and epoxy resin with5%so that we can achieve theimprovement of compressive and flexural strength of the block. According to the test ofthe data the block has best mechanical property with the percentage of40. Now comparedwith the comparison group the block's compressive strength of7d has been improved with71.5,60.2and28d has been improved with63.6,70.0when we add plant fiber with1kg/m3. The block's compressive strengthof7d has been improved with25.6,49.7and28d has been improved with21.4,41.4when we add EP with5%.Lastly, we design the mixture as percentage of lightweight aggregate are30%and40%and make standard test pieces of thermal conductivity for4groups with the size of300mm×300mm×30mm, check thermal conductivity to compare with each other. On thebasis of test, the thermal conductivity of lightweight and insulation block with glazedhollow bead and ceramist is0.277and0.074with the percentage of40. That's largelylower than1.74about traditional concrete and0.8about sintering clay. So they can makethermal insulation come true.