改良ALC轻质板建筑性能及碳减排措施研究

建筑业在双碳政策下必然得走绿色低碳转型道路,因此,有必要研究使用新型绿色节能建筑材料,以全方位减少建筑工程施工及运营阶段的能效及碳排放。本文以某在建项目为例,研究聚丙烯ALC轻质板的工程性能及碳减排措施。研究结果得知,蒸压混凝土墙板和聚丙烯混凝土改良后施工方便、绿色环保,具有较大的建筑工程绿色革命的驱动力,在建材生产、运输及施工阶段采取合适措施可有效减碳节能。

探析建筑材料性能选择对混凝土早期裂缝的影响

为探讨建筑材料性能对混凝土早期裂缝的影响,以水泥、粉煤灰、粗细集料、纤维为原材料进行平板试验,用钢板试模做裂纹断裂试验。混凝土强度等级设计为C25、C30、C35,各自对应3种水胶比,试验时向平坦的地面放置试模,铺设塑料片,按照强度等级要求和配合比进行拌和。试验结果显示,水泥比在预拌混凝土时发挥作用;在粉煤灰掺量一致的前提下,水胶比为0.38时混凝土的抗裂性最佳,其它2个组分的混凝土所具备的抗裂性相对更弱;3个组分中,混凝土的抗裂性在水胶比为0.38时最优。

房建项目中绿色建筑材料的选择与节能效率

随着全球对环境可持续性的高度关注,绿色建筑材料在房屋建筑项目中的应用成为了提升能源效率和减少环境影响的关键手段。本文探讨了在房屋建筑施工中选择绿色建筑材料的标准与节能效率之间的直接关系。通过分析不同绿色建材的性能,明确了它们在节能和环保方面的具体贡献。结果表明,合理选择和应用绿色建材不仅可以显著降低建筑的能耗,还能改善室内环境质量,实现建筑项目的可持续发展目标。

污泥烧结轻骨料调质影响研究

研究了污泥添加不同比例的SiO2,Al2O3,CaCO3和Na2CO3后的烧结体建材性能,并从晶体相反应机理角度讨论了添加剂改变烧结体建材性能的作用机理.结果表明,添加硅、铝能显著提高烧结体的抗压强度,硅是玻璃体成陶组分,对提高烧结体的抗压强度主要发挥物理作用;铝主要与污泥中的磷反应生成类似石英结构的AlPO4高强晶体.添加钠能增加烧结体的熔融液相,降低烧结体的吸水率,但烧结体变脆抗压强度降低.添加钙增大吸水率,降低抗压强度.此外,硅、铝会导致烧结体烧结温度提高,钠则能显著降低烧结温度.

竹材建筑墙体的发展及研究现状

在人类文明进程中,竹材是赖以生存的建筑材料,随着建筑形式的转变,竹材似乎离人们生活越来越远。本世纪以来,竹材在建筑上的应用越来越广泛,特别是用于制造建筑墙体。采用现在的技术手段和构造方式,将竹材用于现代建筑的墙体,有很好的经济性和适应性。在建筑节能的呼声日益高涨的今天,竹材这种古老的墙体结构将有机会重归建筑领域。

铝塑复合防火板的研究进展

本文介绍了目前中国铝塑复合防火板材料的现状和研究发展方向，比较了不同阻燃机理的阻燃效果，侧重时我国与欧洲、日本的建材燃烧性能分级体系用于铝塑复合防火板的燃烧性能分级异同进行了比较与分析，以期为各铝塑板企业的国际贸易工作提供一定的参考和借鉴。

防火铝塑复合板阻燃技术的研究进展

本文主要介绍了目前国际上铝塑复合板材料阻燃技术的研究现状和技术发展方向,研究了无卤阻燃机理的阻燃改性效果,侧重对欧洲最新阻燃建材标准用于防火铝塑复合板的燃烧性能分级进行比较与分析,以期为各铝塑复合板企业的新产品开发工作提供一定的参考和借鉴。

Preparation of low-cost waterproofing materials

To address the need for producing a cheap,single-component,hot-applied compound joint sealant with high quality for sealing joints and cracks in concrete and flexible pavements without using primer for installation,a hot-applied modified asphalt sealant was produced by blending up about 30% starch into 20% citric acid.The starch and the asphalt cement were mixed at a temperature of above 160 ℃.Thus the waterproofing asphalt was manufactured to protect the surface of various shapes and types from water leakage using the citric acid.Results indicate that this sealant complies with the requirements of ASTM D-1191,D-6690-06a and D-7116-05.The citric acid is a kind of reliable materials for asphalt cement,which can be widely used in paving and waterproofing construction materials,and this offers profound engineering and economic advantages.

Timing Belts Dynamics Model Approach

Design of composites and usage of new polymer materials allows for improvement of constructional properties of belts. Different applications： transmission, conveying or controlling have different meshing in gear. The work presents meshing model between timing belt and pulley and constructional features of transmission timing belts depending on materials used for their production. While designing timing belt, much attention should be paid to selection of materials, which has significant influence on mechanical properties of belts. This paper attempts to identify the model material and the nature of cooperation of timing belt-pulley; this is basic knowledge for the development of timing belt gear.

Elements of Structural Masonry Reinforced with Sisal Fibers

There is great interest in the use of natural fibers as reinforcement to obtain new construction materials due to its low cost, high availability and reduced energy consumption for its production. This paper evaluates the incorporation of sisal fibers of 20 mm and 40 mm in length and volume fraction of 0.5% and 1% for concrete masonry structural blocks, and determines the use of these units to build prisms and mini-walls. Laboratory tests were carried out to characterize the physical of blocks and mortar, in addition to the axial compression tests of the units, prisms, and mini-walls. The sisal had low apparent density and high water absorption, which is a common feature of such material due to the high incidence of permeable pores. The physical properties of the blocks with and without addition complied with the standard requirements established to validate their use. The obtained results showed that the fiber-reinforced mini-walls obtained values very close to or even higher than those obtained for the mini-walls without fibers, demonstrating better performance than the blocks and prisms.

Studying the Properties of Lightweight Concrete Using Construction Materials Waste

The main purpose of this research is to study the mechanical properties of lightweight concrete through the using of different types of lightweight aggregate. Three types of lightweight aggregate were used in this study for the production of lightweight concrete. These types are red block aggregate, red ceramic aggregate and white thermostone aggregate. All these types have been brought from construction waste. A comparison of the properties of lightweight concrete with normal concrete is the most important goal of this study. The most important properties of concrete, which were compared with each other is compressive strength, static modulus of elasticity, splitting tensile strength and slump flow.

Study on the Relation between Individual Layer and Multi-layered Nonwoven Geotextile Permeability

Water permeability is an important property of nonwoven geotextiles used in drainage field, and usually it is obtained by testing individual layer or multi-layered nonwoven geotextiles. However, the permeability coefficient tested by using different layers would be different for the same nonwoven geotextile. In this paper, the relation between them is studied based on Darcy's law. The study shows that vertical permeability coefficients are theoretically invariable no matter how many layers are tested; but experimental results show that vertical permeability coefficients decrease with the increase of nonwoven geotextile layers number.

Discussion on the Effects of Temperature, Carbon Fiber and Silica

Concrete, as an essential construction material in the construction industry, is the main component of solid waste. To improve the strength and durability of concrete, some additives can be added into concrete to replace parts of cement. Carbon fiber and silica powder are the most common additives. Under a series of experiments, the effects of temperature, carbon fiber and silica powder on the mechanical properties of concrete were studied under normal circumstances. In this paper, a conclusion on the effects was drawn up mainly through some experimental analyses, so as to discuss the effect laws and provide a reference to manufacture the concrete of high strength and properties.

Characterization of Stabilized Earth Blocks with Incorporation of Cement Expanded Polystyrene for Use in Buildings

This work focuses on the development of local building materials in Benin for their efficient use in buildings. It aims to make mud bricks lightened with good mechanical, thermal and sound properties and enhance the waste polystyrene. This article is the result of experimental work on a broad field of applied sciences： building mechanics. The study is focused on BTS （blocks of stabilized earth） chosen as reference materials to which we linked polystyrene. The percentage of polystyrene varies from 0% to 100% starting from a constant volume of each reference material. The results showed that the increase in polystyrene percentage lowers mechanical properties. These results also showed that the gradual addition of polystyrene to the laterite-cement mixture has a significant influence on the density and mechanical resistances of the final composite material.

Value-added recycling of sludge and sludge ash into low-carbon construction materials:current status and perspectives

Sludge as the by-product of wastewater treatment usually accumulates toxic substances that require specific treatment before disposal.With the increase of sludge production,the safe and economic treatment of sludge has become a global issue.Construction filed provides a solution for consuming huge volumes of sludge and sludge ash owing to the similar chemical composition with cementitious materials.This paper critically reviewed the current status of recycling sludge and sludge ash into low-carbon construction materials and highlighted the future perspectives of sludge-derived construction materials.Furthermore,the immobilization mechanisms of heavy metals in sludge-derived construction materials were elaborated to promote the actualization of sustainable management of sludge and sludge ash.

Ultrahigh performance concrete–properties, applications and perspectives

Over the last twenty years,remarkable advances have taken place in the research and application of ultra-high performance concrete(UHPC),which exhibits outstanding mechanical properties and excellent durability.It has shown great potential for the next generation infrastructure construction from the sustainability point of view.This paper will give an overview on UHPC,with particular focus on the properties,applications and perspectives.After several decades of development,several types of commercial UHPC materials are available in the market,and the properties of UHPC have been characterized by numerous experimental and field tests.Generally speaking,the performance(e.g.mechanical properties and durability)of UHPC is much better than normal concrete(NC)and high performance concrete(HPC).Therefore,the uses of UHPC are growing all over the world,in both fields of new construction and retrofitting.Nevertheless,it is still a special material and technology,which is not worldwide accepted.So some application prospects of UHPC are briefly introduced in the paper,and the efforts,which have to be made to turn UHPC into a widespread‘regular’technology,are discussed.This paper aims to help designers,engineers,architects and infrastructure owners to know the capacities of UHPC and thus to increase the applications of this material.

Physical-Mechanical Properties of Sympodial Bamboo and Influence on Architecture Material Manufacture

Two kinds of big sympodial bamboo, D.Yunnanicus Hsueh and Whangee (D. Membranaceus Munro) andtheir physical and mechanical properties have been studied in the paper. The results showed that the whangee hasbetter physical properties than that of the Yunnanicus, such as higher density, lower tangential and longitudinal dryshrinkages. That also showed that Whangee has stronger mechanical properties in MOR and MOE, compressivestrength and shear strength parallel to the grain. Compared with some wood species used in architecture, the physicaland mechanical properties of the two kinds have reached the requirement of some wood architecture structurematerials.

Study on Physical and Mechanical Properties of Structural Laminated Bamboo Panel

In this paper, the physical and mechanical properties of laminated bamboo lumber were studied by testing moisture content, delamination ratio, horizontal shear strength, MOE and MOR of the structure-use material, in the same time, these subjects of finger-joint were tested too. The results showed that, the horizontal shear strength, MOR, MOE of laminated bamboo were superior to the ordinary structure-use timber in architecture, such as Pinus. The performance of aging test was not extraordinary, although the physical and mechanical properties of laminated bamboo lumber decreased after aging test, these properties were beyond Pinus yet.

Evaluation of Strength Performance of Finger-jointed Lumbers Using Three Kinds of Nondestructive Techniques

Resonance flexural vibration(Fast Fourier Transform, FFT), ultrasonic wave(Pundit) and stress wave(Metriguard) techniques were examined as means of evaluating the static modulus of elasticity (MOE) and predicting the modulus of rupture (MOR) of finger-jointed lumber specimens made with four kinds of Eucalyptus (Eucalyptus. citriodora, E. exserta, E. grandis x E. urophylla and E. grandis). Dynamic MOE was calculated from frequency and time obtained from forced vibrations and sounds induced in the four species of finger-jointed specimens. It was found that correlation coefficients between density and static MOE and dynamic MOE were statistically significant at the 0.01 level. And it was also found that the three nondestructive techniques can provide rapid and accurate means to determine the MOE, and the dynamic MOE was more accurate to predict static MOE than density. But the correlation coefficient between dynamic MOE, static MOE and MOR were lower than results reported by other researchers for solid wood, and were not statistically significant. It can be concluded that the three nondestructive techniques are useful for evaluating the MOE, but not suitable for predicting the MOR of finger-jointed.