固废基人造石材成型与养护工艺研究

Research on Molding and Curing Technology of Solid Waste-Based Artificial Stone

以固废基复合超微粉为原料,经过静压成型和热养护制备试块,采用X射线衍射(XRD)和扫描电镜(SEM)表征试块的微观结构和矿物组成,考察成型压力、试块厚度、养护制度等工艺对试块抗压强度和密度的影响。结果表明,适宜的成型压力为50 MPa,试块厚度为17.5 mm(复合粉添加量为75 g)。试块养护3 d及以上后,养护龄期相同时,不同养护制度下试块强度为:自然养护<水热养护<自然养护+热水养护<水热养护+热水养护;采用“水热养护+热水养护”的养护制度,可获得28 d强度达145.5 MPa的固废基高强试块,满足优质天然石材的强度指标(MU100),表明工业固废可制备优质人造石材。

The solid-waste-based composite ultrafine powder was used as raw material to prepare test blocks through static pressing and thermal curing using XRD and SEM to characterize the microstructure and mineral composition of the test blocks.The effects of molding pressure,thickness and the curing system on the compressive strength and density of the test block were also investigateal.The results show that the suitable forming pressure for this experiment is 50 MPa,and the thickness of the test block is 17.5 mm(the compound powder is 75 g);curing for 3 days or more,the strength of the test block for the same curing age is:natural curing<hydrothermal curing<natural curing+heat water curing<hydrothermal curing+hot water curing;adopting the curing system of“hydrothermal curing+hot water curing”,a solid waste base high-strength test block with 28 d strength of 145.5 MPa can be obtained,which meets the strength index of high-quality natural stone(MU100),indicating that industrial solid waste can be used to prepare high-quality artificial stone.