基于相似正交试验的透水性混凝土配合比研究

基于混凝土强度和透水性要求.根据现有试验室条件,运用相似原理和正交试验原理对C15透水性混凝土的配合比进行试验研究.采用3因素3水平均值相似正交法进行了水灰比、骨灰比、骨料粒径对混凝土透水系数和抗压强度的影响的试验.根据试验数据分别采用绝对数值法和相对数值法的多项式拟合和线性回归,定量研究了各单因素和多因素对抗压强度和透水系数的影响,并定量分析各因素的显著性.研究表明该方法同样适合于分析不同因素、基于不同性质和目的的透水性混凝土配合比的设计.     

高透水性混凝土配合比设计及性能试验研究

文章根据目前国内外对透水性混凝土的研究现状,运用正交试验原理对高透水性混凝土的配合比进行试验研究,研究了骨灰比、水灰比和骨料级配等因素对其透水性能和力学性能的影响规律,选出了最佳混凝土配合比,为透水性混凝土的配合比设计提供了依据。     

透水性混凝土配合比试验探讨

文章结合近年的工作经验以及对相关资料的查阅,根据现有实验室条件,运用相似原理和正交实验原理对C15透水性凝土的配合比进行试验方法研究,以满足混凝土强度和透水性要求。本实验采用3因素3水平均值相似正交法对水灰比、骨灰比、骨料粒径对混凝土空隙率、透水率和抗压强度影响进行研究,根据透水性混凝土性能要求确定试配强度、水泥用量、水灰比、粗集料用量等因素。根据所建立的正交试验表,方差分析和线性回归分析确定最优配合比和各因素显著性的方法。结果表明,此研究方法在分析不同因素、基于不同性质和目的的透水性混凝土配合比的设计等方面都以实用。     

彩色透水性混凝土的研究与应用

针对彩色透水混凝土着色不均匀、孔隙率大,强度低等质量通病,通过正交试验研究水胶比、粗骨料粒径、砂率和着色剂对彩色混凝土的影响,设计出强度高且透水性良好的彩色透水混凝土.     

再生砖骨料多孔混凝土强度和透水性能研究

由于再生砖骨料的特殊性以及多孔混凝土的多孔性,再生砖骨料多孔混凝土的结构和破坏特征与普通混凝土有很较不同。再生砖骨料多孔混凝土应用于工程时,既要保证有较高孔隙率,又要保证其作为护坡结构组成部分的力学强度,为了对该混凝土的结构性能进行分析,设计了控制变量试验,研究骨料粒径、水灰比、目标空隙率对力学性能和透水性的影响,同时设计了正交试验研究上述因素对多孔混凝土性能的影响大小,并得出目标孔隙率对抗压强度和有效孔隙率都有显著影响。分析混凝土抗压强度、实测孔隙率及透水性三者的关系,以三者的平衡点为目标,确定高强度,合理透水性,适于植物生长的最佳配合比。     

透水混凝土性能研究

透水混凝土是一种生态友好型混凝土,是经过特殊工艺制成的具有连续孔隙率的混凝土。它具有较高的强度和良好的透气、透水性。本文对其配合比设计和基本的物理力学性能进行了一系列的试验研究,利用体积法进行透水混凝土的配合比设计,通过以水灰比、目标孔隙率、集料级配和矿物掺合料为因数设计正交试验,获得了最佳配合比;最后对透水混凝土的透水性能进行分析。     

透水性混凝土路面砖的研制

阐明了透水性混凝土的透水机理，并对透水性混凝土路面砖的配比设计，施工工艺和性能进行了试验研究，提出了透水性混凝土砖配比的最佳设计方法。     

高透水性混凝土配合比设计与性能试验探讨

在本文中主要分析了当前国内外在高透水性的材料研究方面的情况,并通过正交实验的理论指导试验,从而能够更好地掌握高透水性的混凝土配合情况,在混凝土配合方面主要抓住水灰比、骨灰比以及骨料之间的比例,使得混凝土能够得到良好的透水性,并能够便于人们更好地掌握混凝土搭配的情况。     

高强透水性混凝土材料试验研究

透水性混凝土材料具有绿色、环保等特点,可应用于人行道、停车场、透水性路面、土工结构排水系统反滤层等,有很好的发展前景,但因强度低影响了其应用范围。本文对透水性混凝土材料进行了试验研究,讨论了影响透水性混凝土材料强度和渗透性的因素,提出了增强透水性混凝土材料强度的措施。研究认为。水灰比、粗骨料的种类和级配、矿物掺合料以及其它增强材料是影响透水性混凝土材料强度的主要原因。并对这些因素对强度的影响进行了定量分析。试验还对透水性混凝土材料的渗透性进行了测试。根据试验结果推荐的原材料、配比和试验方法,可以得到强度达到30MPa,渗透性在1mm／s以上的透水性混凝土。满足一般工程需要。研究成果已经应用干铁道部某项目并取得成功。     

无砂再生骨料透水性混凝土试验及应用研究

采用正交试验的分析方法对无砂再生骨料透水混凝土的性能进行了研究,得出了再生骨料混凝土同时具有较高的抗压强度和透水性,并进行了此再生骨料透水混凝土在公路建设方面的应用可行性分析。     

生态混凝土透水砖的研发及应用

介绍了使用正交法设计生态混凝土透水砖，以透水砖的抗压强度、透水系数为指标，分析研究了骨料粒径、水灰比、骨灰比等因素及其对透水砖各性能指标的影响。实验结果，使用正交设计法可以获得符合性能要求的高强度透水铺地砖的最优配合比。同时，分析了生态透水砖对环境的影响变化、发展趋势。以及路面铺装工艺设计原理。     

Paving blocks made with recycled concrete aggregate and crushed clay brick

Clay brick generated from construction sites is usually delivered to landfills for disposal. With the limited landfill space in Hong Kong, there is an immediate need to explore the possible use of crushed clay brick as a new civil engineering material. In Hong Kong, government specifications promote the use of paving blocks made with 70–100% recycled concrete aggregate in order to facilitate the recycling of construction and demolition (C&D) waste. This paper presents a recent study at the Hong Kong Polytechnic University on the investigation of blending recycled concrete aggregate and crushed clay brick as aggregates in the production of paving blocks.The results indicated that the incorporation of crushed clay brick reduced the density, compressive strength and tensile strength of the paving blocks. Due to the high water absorption of crushed clay brick particles, the water absorption of the resulting paving blocks were higher than that of the paving blocks that did not incorporate crushed clay brick. Although it was found that crushed clay brick impaired the quality of the resulting paving blocks to a certain extent, the paving blocks using 50% crushed clay brick met the minimum requirements specified by AS/NZS 4455 and ETWB of Hong Kong (Grade B) for pedestrian areas. Furthermore, it was feasible to produce paving blocks prepared with 25% crushed clay brick that satisfied the compressive strength requirement for paving blocks (Grade B) prescribed by ETWB of Hong Kong for trafficked area.     

Comparison of test specimen preparation techniques for pervious concrete pavements

The objective of this study was to evaluate different pervious concrete test specimen preparation techniques in an effort to produce specimens having properties similar to in-place pervious concrete pavement. Cylinders and slabs were cast using pervious concrete from three different paving projects using different procedures. The comparisons of cast specimens to pavement cores were based on infiltration rate, density, and porosity. Of the cylinder consolidation procedures tested, the standard Proctor hammer provided the least variability of results and yielded properties similar to the in-place pavement. However, 600 mm square slabs were even more consistent with the in-place pavement density and porosity.     

Performance comparison of laboratory and field produced pervious concrete mixtures

Portland cement pervious concrete (PCPC) is an environmentally friendly paving material that has been increasingly used in parking lots as well as low volume and low speed pavements. Although specifications are available for the mix design and construction of pervious concrete, there still remains a need for laboratory tests to ensure the anticipated performance of laboratory designed pervious concrete. In this study, the performance of laboratory and field produced pervious concrete mixtures as well as field cores were evaluated and compared through laboratory performance tests, including air voids, permeability, compressive and split tensile strengths, as well as Cantabro and freeze–thaw durability tests. Two types of coarse aggregate, limestone and granite, with two gradings, No. 8 and No. 89 specified in ASTM C33, were used to produce the mixtures. Latex, air-entraining admixture (AEA), and high range water reducer (HRWR) were also added to improve the overall performance of pervious concrete. The results indicated that the mixtures made with limestone and latex had lower porosity and permeability, as well as higher strength and abrasion resistance than other mixtures. Even for pervious concrete, the addition of AEA could still help to improve the freeze–thaw resistance. The comparison between laboratory and field mixtures showed that a properly designed and laboratory verified pervious concrete mixture could meet the requirements of permeability, strength, and durability performance in the field.     

Influence of stratigraphy and slope on the drainage capacity of permeable pavements: laboratory results

A small size laboratory test-bed was realized at the University of Genoa in order to evaluate the drainage capacity of permeable pavements by monitoring inflow, runoff and sub-surface outflow. The laboratory test programme was designed to investigate the influence of rainfall intensity and pavement slope on the hydrologic response of permeable pavements. Four permeable pavement systems combining two paving types (concrete cell and pervious brick) with two filter layers made of recycled glass aggregate and a mix of gravel and coarse sand are tested. The hydrologic response of permeable pavements is analysed by using a dimensionless volume index (discharge coefficient) and a timing index. Laboratory results reveal that the hydrologic performance is fairly consistent for all the investigated permeable pavements. The recycled glass aggregate turns out to be a valid solution. No surface runoff occurs even at 98 mm/h rainfall intensity.     

奥运公园露骨料透水路面的混凝土施工技术

露骨料透水混凝土路面是一项绿色环保技术,已经在北京奥运工程中成功应用,通过混凝土制备、摊铺施工、质量控制和冬施措施等几方面对混凝土施工技术进行了介绍.     

光泽型彩色混凝土路面砖的生产与应用

光泽型彩色混凝土路面砖是一种新型人行道路面铺设材料。本文介绍了光泽彩砖的特性、生产工艺技术、控制要点及应用情况。     

聚合物对生态透水砖性能影响的研究

主要探讨聚合物对透水砖的力学性能和透水性能的影响,并阐述了聚合物的改性机理。采用特殊工艺生产出符合要求的生态型透水砖。实验结果表明,通过掺入聚合物对水泥进行改性,可提高透水砖的抗压强度。聚合物种类和掺量对透水砖性能均具有显著影响。     

成型方式和砂率对透水混凝土性能的影响

主要分析了成型方式和砂率对透水混凝土性能的影响.通过对不同成型方式制作的透水混凝土性能比较,分析了成型方式对透水混凝土性能的影响,确定了合适的成型方式.试验通过调整砂率,分析了砂率对透水混凝土性能的影响,试验结果表明掺入适量的细骨料,可以在保证透水的基础上,提高透水混凝土的强度.     

浅析透水混凝土配合比设计技术

通过透水混凝土配合比的设计实例,介绍了透水混凝土配合比设计的方法和步骤,分析了影响透水混凝土性能的因素。文中的透水混凝土按体积法的设计原理,以粗集料空隙率、目标孔隙率、水灰比为配合比主要指标,对试件的透水系数、抗压强度、抗折强度进行综合控制．从而获得最终配合比。