节能降碳_2023_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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节能降碳

疏浚底泥基免烧陶粒的配合比设计及软化系数优化研究

王泽生1，董田良1，曾彦生1，李昱洁1，段平2

2023年第8期

摘要

引用本文

摘要：固定疏浚底泥的掺量为50%，通过调整m水泥∶m石膏∶m矿渣设计制备了免烧陶粒，对比了改性前后免烧陶粒的筒压强度、吸水率和软化系数。此外，为了提高免烧陶粒的软化系数并降低水泥掺量，采用单纯形重心混料设计方法优化了免烧陶粒的配合比。结果表明：当底泥掺量固定为50%时，随着水泥掺量的增加，未改性和改性免烧陶粒的筒压强度和软化系数基本呈增大趋势，吸水率基本呈降低趋势；与未改性免烧陶粒相比，改性免烧陶粒的筒压强度和软化系数增大，吸水率降低；优化后的最佳m水泥∶m石膏∶m矿渣为0.60∶0.10∶0.30，此时，制备的改性免烧陶粒的软化系数为0.88，满足相关标准要求，且筒压强度较高，吸水率较低。 Abstract: Under the condition of a fixed dredged sediment content of 50%, non-sintered ceramsite was prepared by adjusting the design of mcement∶mgypsum∶mslag, and the cylinder compressive strength, water absorption rate, and softening coefficient of non-sintered ceramsite before and after modification were compared. In addition, in order to improve the softening coefficient of non-sintered ceramsite and reduce the cement content, the mix proportion of non-sintered ceramsite was optimized by using the monomorphic center of gravity mixing design method. The results show that when the content of dredged sediment is fixed at 50%, with the increase of cement content, the cylinder compressive strength and softening coefficient of unmodified and modified non-sintered ceramsite show an increasing trend, while the water absorption rate shows a decreasing trend. Compared with unmodified non-sintered ceramsite, the cylinder compressive strength and softening coefficient of modified non-sintered ceramsite increase, while the water absorption rate decreases. The optimized optimal mix proportion is that mcement∶mgypsum∶mslag is 0.60:0.10:0.30, and the softening coefficient of the prepared modified non-sintered ceramsite is 0.88, which can meet the requirements of relevant standards, and the cylinder compression strength is high and the water absorption rate is low.

王泽生,董田良,曾彦生,等.疏浚底泥基免烧陶粒的配合比设计及软化系数优化研究[J].混凝土与水泥制品,2023(8):83-87. WANG Z S,DONG T L,ZENG Y S,et al.Study on mix proportion design and softening coefficient optimization of dredged sediment based non-sintered ceramsite[J].China Concrete and Cement Products,2023(8):83-87.

聚丙烯酰胺对钢渣混凝土性能的影响

叶晨峰1，2

2023年第8期

摘要

引用本文

摘要：研究了聚丙烯酰胺（PAM）掺量对钢渣混凝土工作性、力学性能和抗碳化性能的影响，并进行了XRD分析。结果表明：掺入适量钢渣微粉会使混凝土的流动度下降，凝结时间延长，28 d的抗压、抗折强度下降，抗碳化性能提高；随着PAM掺量的增加，钢渣混凝土的流动度先增大后减小，凝结时间延长，28 d抗折强度先增大后减小，28 d抗压强度减小，碳化深度先减小后增大。 Abstract: The effects of the content of polyacrylamide (PAM) on the workability, mechanical properties, and carbonation resistance of steel slag concrete were studied, and the XRD analysis was conducted. The results show that adding an appropriate content of steel slag powder can reduce the fluidity of concrete, prolong the setting time, decrease the 28 d compressive and flexural strength, and improve the carbonization resistance. With the increase of PAM content, the fluidity of steel slag concrete first increases and then decreases, the setting time prolongs, the 28 d flexural strength first increases and then decreases, the 28 d compressive strength decreases, and the carbonization depth first decreases and then increases.

叶晨峰.聚丙烯酰胺对钢渣混凝土性能的影响[J].混凝土与水泥制品,2023(8):88-92. YE C F.Effect of polyacrylamide on properties of steel slag concrete[J].China Concrete and Cement Products,2023(8):88-92.

粉煤灰和矿粉对OPC-SAC基路面修补材料性能的影响

任双倩1，赵世冉1，宋心2，王欢2，袁倩男1

2023年第8期

摘要

引用本文

摘要：研究了m粉煤灰∶m矿粉（1∶0、2∶1、1∶1、1∶2、0∶1）对普通硅酸盐水泥-硫铝酸盐水泥（OPC-SAC）基路面修补材料凝结时间、流动度、抗压强度、拉伸黏结强度和水化放热行为的影响。结果表明：掺入粉煤灰和矿粉会降低OPC-SAC基路面修补材料的水化放热量和水化放热速率，延长凝结时间，增大流动度，降低抗压强度，提高拉伸黏结强度；随着矿物掺合料中矿粉占比的增大，OPC-SAC基路面修补材料的凝结时间延长，流动度、抗压强度和拉伸黏结强度均先增大后减小，最佳m粉煤灰∶m矿粉为1∶2。 Abstract: The effects of mfly ash∶mmineral powder (1∶0, 2∶1, 1∶1, 1∶2, 0∶1) on the setting time, fluidity, compressive strength, tensile bond strength and hydration exothermic behavior of ordinary Portland cement-sulphoaluminate cement(OPC-SAC) based pavement repair materials were studied. The results show that adding fly ash and mineral powder can reduce the hydration heat release and hydration heat release rate of OPC-SAC based pavement repair materials, extend the setting time, increase fluidity, reduce compressive strength, and improve tensile bond strength. As the content of mineral powder in the admixture increases, the setting time of OPC-SAC based pavement repair materials is prolonged, and the fluidity, compressive strength, and tensile bond strength first increase and then decrease. The optimal ratio of mfly ash∶mmineral powder is 1∶2.

任双倩,赵世冉,宋心,等.粉煤灰和矿粉对OPC-SAC基路面修补材料性能的影响[J].混凝土与水泥制品,2023(8):93-96,104. REN S Q,ZHAO S R,SONG X,et al.Effect of fly ash and mineral powder on performance of OPC-SAC based pavement repair materials[J].China Concrete and Cement Products,2023(8):93-96,104.

超疏水铁尾矿石的制备及其对混凝土性能的影响

赵寅山1，张小兵2，*

2023年第8期

摘要

引用本文

摘要：采用硬脂酸和乙醇改性铁尾矿石，制备了超疏水铁尾矿石，研究了硬脂酸的掺量（2%、4%、6%、8%、10%、12%）对超疏水铁尾矿石疏水性的影响，分析了超疏水铁尾矿石的掺量（0、10%、20%、30%）对混凝土疏水性、工作性和吸水率的影响。结果表明：随着硬脂酸掺量的增加，超疏水铁尾矿石的水接触角先增大后减小，当硬脂酸掺量为8%时，超疏水铁尾矿石的水接触角为153°，达到超疏水状态；随着超疏水铁尾矿石掺量的增加，混凝土的疏水性提高，稠度增大，吸水率降低。 Abstract: Superhydrophobic iron tailings stone was prepared by modifying iron tailings powder with stearic acid and ethanol. The effects of the content of stearic acid (2%, 4%, 6%, 8%, 10%, 12%) on the hydrophobicity of superhydrophobic iron tailings stone were studied, and the influence of the content of superhydrophobic iron tailings stone (0%, 10%, 20%, 30%) on the hydrophobicity, workability, and water absorption of concrete was analyzed. The results show that with the increase of stearic acid content, the water contact angle of superhydrophobic iron tailings stone first increases and then decreases. When the stearic acid content is 8%, the water contact angle of superhydrophobic iron tailings stone is 153°, reaching a superhydrophobic state. With the increase of the content of superhydrophobic iron tailings stone, the hydrophobicity of concrete increases, the consistency increases, and the water absorption rate decreases.

赵寅山,张小兵.超疏水铁尾矿石的制备及其对混凝土性能的影响[J].混凝土与水泥制品,2023(8):97-100. ZHAO Y S,ZHANG X B.Preparation of superhydrophobic iron tailings stone and its effect on performance of concrete[J].China Concrete and Cement Products,2023(8):97-100.

低温环境对矿物掺合料水化活性的影响

郭俊峰，王锴，马晓耘

2023年第8期

摘要

引用本文

摘要：为了探究低温下矿物掺合料的水化活性，通过净浆抗压强度试验和XRD测试，对比研究了偏高岭土、粉煤灰和矿渣分别在常温[（20±2）℃]和低温（5 ℃）环境下的水化活性。结果表明：与常温情况相比，低温下，掺矿物掺合料试件中的Ca(OH)2衍射峰增强，Ca(OH)2主峰面积增大，说明低温在一定程度上抑制了胶凝体系的水化程度；低温对粉煤灰的早期水化活性降低最明显，其次是偏高岭土，对矿渣的早期水化活性影响相对较小；低温对偏高岭土的后期水化活性降低最明显，其次是粉煤灰，对矿渣的后期水化活性影响相对较小。 Abstract: In order to investigate the hydration activity of mineral admixtures at low temperatures, the hydration activity of metakaolin, fly ash, and slag were compared and studied through compressive strength tests and XRD tests at room temperature[(20±2)℃] and low temperature(5 ℃) environments, respectively. The results show that compared with room temperature, the diffraction peak of Ca(OH)2 and the main peak area of Ca(OH)2 in the specimen with mineral admixtures are enhanced at low temperature, indicating that low temperature inhibits the hydration degree of the cementitious system to some extent. Low temperature has the most significant effect on the early hydration activity of fly ash, followed by metakaolin, which has a relatively small impact on the early hydration activity of slag. Low temperature has the most significant effect on the later hydration activity of metakaolin, followed by fly ash, which has a relatively small impact on the later hydration activity of slag.

郭俊峰,王锴,马晓耘.低温环境对矿物掺合料水化活性的影响[J].混凝土与水泥制品,2023(8):101-104. GUO J F,WANG K,MA X G.Effect of low temperature environment on hydration activity of mineral admixtures[J].China Concrete and Cement Products,2023(8):101-104.

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