【摘要】：隨著建筑業(yè)的發(fā)展，建筑用砂量越來越大，而河砂資源越來越少，機制砂代替河砂勢在必行。青島地區(qū)的石材主要是花崗巖，機制砂生產時將會產生10%左右的石粉，如不加以利用，將會堆積占用土地，縮小了人們活動空間，不利于城市的美化，粉塵還有可能隨時被大風刮起，形成揚塵天氣，不但污染空氣，還嚴重威脅著人的健康。 本文基于充分利用資源的想法，進行了利用花崗巖石粉用作混凝土摻合料和制備加氣混凝土、發(fā)泡水泥材料的一系列試驗研究工作。經過系統(tǒng)的試驗研究，探討了花崗巖石粉的摻量對產品性能的影響規(guī)律，得出了花崗巖石粉在混凝土、加氣混凝土和發(fā)泡水泥中的最佳摻量范圍，達到了既不影響產品的使用性能，也能最大程度的利用花崗巖石粉的預期目標。 花崗巖石粉用作混凝土摻合料的相關研究：膠凝材料的用量分別為350kg/m3、400kg/m3、450kg/m3，花崗巖石粉和礦粉分別取代部分水泥，并研究了花崗巖石粉和礦粉復合使用的效果。試驗表明，三種摻合方式均會降低混凝土3d，7d，14d抗壓強度，而對混凝土28d抗壓強度有一定的增強作用。過試驗對比發(fā)現，單摻花崗巖石粉混凝土抗碳化性能最優(yōu)，最佳摻量為10%。 花崗巖石粉制備加氣混凝土的相關研究：以花崗巖石粉摻量占粉煤灰的0%、25%、50%、75%和100%，鋁粉用量為膠凝材料的1.2‰，水膠比為0.6、0.63和0.65進行試驗，探究干表密度和抗壓強度的變化規(guī)律，確定花崗巖石粉最大摻量。試驗表明，，花崗巖石粉活性成分較少，顆粒相對稍大，不能完全參與水化反應，因此花崗巖石粉在漿體中會產生微集料效應，起到骨架支撐作用。加氣混凝土中花崗巖石粉的適宜摻量應控制在25%以內。 花崗巖石粉制備發(fā)泡水泥材料的相關研究：以花崗巖石粉摻量占膠凝材料總量的0%、5%、10%、15%、20%、25%和30%，分別以花崗巖石粉單摻、花崗巖石粉和粉煤灰復摻進行配比，發(fā)泡劑用量為膠凝材料的3.5%,水膠比為0.7進行試驗。通過分析干表密度、抗壓強度的變化規(guī)律，確定花崗巖石粉的最大摻量為20%。當水膠比在0.7~0.9，發(fā)泡劑用量在3.5%~4%時，制品的抗壓強度在0.41~0.58MPa之間，干表密度在202.2~234.2kg/m3之間；當水膠比在0.7~0.8，發(fā)泡劑用量在4.5%~5%時，制品強度在0.25~0.28Mpa之間，干表密度在186.9~201.3kg/m3。材料的干表密度隨著發(fā)泡劑用量增加而減小，并隨著水膠比的增大先減小后增大，最后趨于穩(wěn)定。制品的氣孔孔徑也隨著發(fā)泡劑用量的增加而變大，孔直徑在0.5～1.5mm之間。隨著水膠比的增加，孔直徑略有增加，但增加的幅度不顯著。
[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

本文編號：2477005