在混凝土制造中再利用混凝土干浆废料的技术可行性

Naamane Sara, Saidi Hassani Alaoui Mohamed, Taleb Mustapha, Rais Zakia
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摘要

混凝土水泥浆废料(CSW)是从预拌混凝土工厂回收的大量工业副产品。本工作旨在研究在混凝土生产中使用这种残留物的可行性,以减少大量处理这种残留物的窘境,减少混凝土装配中使用的天然材料的数量,并生产出碳足迹更低的混凝土。因此,将 CSW 分成三部分,第一部分包含细颗粒部分(< 80 µm)(残留物 1),第二部分包含整个 CSW(残留物 2),第三部分包含通过筛分去除残留物 1 后的剩余 CSW(残留物 3)。然后,一方面用残留物 1 替代 2、4、6、8 和 10% 的水泥,另一方面用残留物 2 和残留物 3 分别替代 5、10、15、20 和 25% 的河砂和碎砂,从而在混凝土中引入 CSW。为了鉴定和分析这些残留物在与混凝土其他成分混合时的表现,对 CSW 的一些化学和物理特性进行了评估。此外,还通过 X 射线荧光 (XRF)、X 射线衍射 (XRD)、傅立叶变换红外光谱仪 (FTIR) 和扫描电子显微镜 (SEM) 对 CSW 进行了表征。对用于制造混凝土的各种成分进行了物理表征,包括粒度分布、细度模数、砂的洁净度、扁平系数、硬度、表观密度和实际密度,以确定用于制作试样的配方。此外,还对新鲜混凝土和硬化混凝土的特性进行了研究,包括艾布拉姆斯锥沉降、密度和抗压强度。研究结果表明,无论替代的是哪种武材,适量的 CSW 都能改善混凝土的物理性质,从而提高其抗压强度,尤其是在 90 天后。因此,在水泥中引入残留物 1 的比例不得超过 2%,用河砂和碎砂替代残留物 2 的比例分别可高达 5%和 10%,而残留物 3 只能以高达 10%的比例替代河砂。
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Technical Feasibility of the Reuse of Dry Concrete Slurry Waste in Concrete Fabrication
Concrete slurry waste (CSW) is an industrial by-product retrieved in large quantities from ready-mix concrete plants. The present work aims to study the feasibility of the incorporation of this residue in the production of concrete to reduce the dilemma of its disposal on huge amounts, decrease the quantities of natural materials used in concrete assembly and produce a lower carbon footprint concrete. Hence, the CSW were divided into three parts, the first part contains the fraction of fine particles (< 80 µm) (residue 1), the second part contains the entire CSW (residue 2) and the third part contains the rest of CSW after the elimination of residue 1 by sieving (residue 3). Then, the introduction of CSW into concrete was achieved, on one hand, by replacing 2, 4, 6, 8 and 10% of cement by residue 1 and, on the other hand, by substituting 5, 10, 15, 20 and 25% of river sand and crushed sand by residues 2 and 3, separately. In order to qualify and analyze the behavior of this residues in the company of other components of concrete, several chemical and physical characteristics of CSW were evaluated. In addition, CSW were characterized by x-ray fluorescence (XRF), x-ray diffraction (XRD), fourier transform infrared spec - trometer (FTIR) and scanning electron microscopy (SEM). The various constituents used in the manufacturing of concrete were characterized physically including particle size distribution, fineness modulus, cleanliness of the sand, flattening coefficient, hardness, apparent density and actual density to conclude the formulation used for the development of the specimens. In addition, the properties of fresh and hardened concretes were also investi - gated, including Abrams cone subsidence, density and compressive strength. The outcome of this study concludes that modest amounts of CSW improve the physical properties of concretes and consequently their compressive strength, especially at 90 days, whatever the type of martial being substituted. Thus, the introduction of residue 1 into the cement must not exceed 2%, the replacement of residue 2 by river and crushed sands can be done at rates up to 5 and 10%, respectively, while the residue 3 can only substitute river sand at a rate up to 10%.
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