花岗岩石粉资源化利用试验研究

发布时间：2019-05-14 19:54

【摘要】：随着建筑业的发展，建筑用砂量越来越大，而河砂资源越来越少，机制砂代替河砂势在必行。青岛地区的石材主要是花岗岩，机制砂生产时将会产生10%左右的石粉，如不加以利用，将会堆积占用土地，缩小了人们活动空间，不利于城市的美化，粉尘还有可能随时被大风刮起，形成扬尘天气，不但污染空气，还严重威胁着人的健康。 本文基于充分利用资源的想法，进行了利用花岗岩石粉用作混凝土掺合料和制备加气混凝土、发泡水泥材料的一系列试验研究工作。经过系统的试验研究，探讨了花岗岩石粉的掺量对产品性能的影响规律，得出了花岗岩石粉在混凝土、加气混凝土和发泡水泥中的最佳掺量范围，达到了既不影响产品的使用性能，也能最大程度的利用花岗岩石粉的预期目标。 花岗岩石粉用作混凝土掺合料的相关研究：胶凝材料的用量分别为350kg/m3、400kg/m3、450kg/m3，花岗岩石粉和矿粉分别取代部分水泥，并研究了花岗岩石粉和矿粉复合使用的效果。试验表明，三种掺合方式均会降低混凝土3d，7d，14d抗压强度，而对混凝土28d抗压强度有一定的增强作用。过试验对比发现，单掺花岗岩石粉混凝土抗碳化性能最优，最佳掺量为10%。 花岗岩石粉制备加气混凝土的相关研究：以花岗岩石粉掺量占粉煤灰的0%、25%、50%、75%和100%，铝粉用量为胶凝材料的1.2‰，水胶比为0.6、0.63和0.65进行试验，探究干表密度和抗压强度的变化规律，确定花岗岩石粉最大掺量。试验表明，，花岗岩石粉活性成分较少，颗粒相对稍大，不能完全参与水化反应，因此花岗岩石粉在浆体中会产生微集料效应，起到骨架支撑作用。加气混凝土中花岗岩石粉的适宜掺量应控制在25%以内。 花岗岩石粉制备发泡水泥材料的相关研究：以花岗岩石粉掺量占胶凝材料总量的0%、5%、10%、15%、20%、25%和30%，分别以花岗岩石粉单掺、花岗岩石粉和粉煤灰复掺进行配比，发泡剂用量为胶凝材料的3.5%,水胶比为0.7进行试验。通过分析干表密度、抗压强度的变化规律，确定花岗岩石粉的最大掺量为20%。当水胶比在0.7~0.9，发泡剂用量在3.5%~4%时，制品的抗压强度在0.41~0.58MPa之间，干表密度在202.2~234.2kg/m3之间；当水胶比在0.7~0.8，发泡剂用量在4.5%~5%时，制品强度在0.25~0.28Mpa之间，干表密度在186.9~201.3kg/m3。材料的干表密度随着发泡剂用量增加而减小，并随着水胶比的增大先减小后增大，最后趋于稳定。制品的气孔孔径也随着发泡剂用量的增加而变大，孔直径在0.5～1.5mm之间。随着水胶比的增加，孔直径略有增加，但增加的幅度不显著。
[Abstract]:With the development of construction industry, the amount of sand used in construction is increasing, and the resources of river sand are less and less, so it is imperative to replace river sand with mechanized sand. The stone materials in Qingdao area are mainly granite, and about 10% of the stone powder will be produced in the production of machine-made sand. If it is not used, it will pile up and occupy the land, reduce the living space of people, and is not conducive to the beautification of the city. Dust may also be blown up by strong winds at any time to form dusty weather, which not only pollutes the air, but also seriously threatens people's health. Based on the idea of making full use of resources, a series of experimental studies on the use of granite powder as concrete admixture and the preparation of aerated concrete and foamed cement materials have been carried out in this paper. Through systematic experimental study, the influence of granite powder content on the properties of the product is discussed, and the optimum mixing range of granite powder in concrete, aerated concrete and foamed cement is obtained. It not only does not affect the performance of the product, but also makes the best use of granite powder. Research on granite powder as concrete admixture: the dosage of cementitious material is 350 kg / m 3400 kg / m ~ 3450 kg / m ~ 3, granite powder and mineral powder replace some cement respectively, and the effect of composite use of granite powder and mineral powder is studied. The test results show that the three mixing methods can reduce the compressive strength of concrete for 3 days, 7 days and 14 days, and can enhance the compressive strength of concrete for 28 days. It is found that the carbonation resistance of concrete mixed with granite powder is the best, and the optimum content is 10%. Research on the preparation of aerated concrete with granite powder: the content of granite powder accounts for 0%, 25%, 50%, 75% and 100% of fly ash, and the amount of aluminum powder is 1.2% of that of cementitious material. The water-binder ratio of 0.6, 0.63 and 0.65 was tested to explore the variation of dry surface density and compressive strength, and to determine the maximum content of granite powder. The results show that the active components of granite powder are less and the particles are relatively large, so the granite powder can not fully participate in the hydration reaction, so granite powder will produce microaggregate effect in slurry and play the role of skeleton support. The suitable content of granite powder in aerated concrete should be controlled within 25%. Research on the preparation of foamed cement materials from granite powder: granite powder accounted for 0%, 5%, 10%, 15%, 20%, 25% and 30% of the total amount of cementitious materials, respectively. Granite powder and fly ash were mixed, the amount of foaming agent was 3.5% of that of cementitious material, and the ratio of water to binder was 0.7. By analyzing the variation of dry surface density and compressive strength, the maximum content of granite powder is determined to be 20%. When the ratio of water to adhesive is 0.7 鈮

本文编号：2477005