Concrete with Addition of Hollow Glass Microspheres

2015 ◽  
Vol 820 ◽  
pp. 509-514
Author(s):  
Cindy Yuri Ueki Peres ◽  
Antonio Hortêncio Munhoz ◽  
L.F. Miranda ◽  
A. Cabral Neto ◽  
A.R. Zandonadi ◽  
...  

The addition of hollow glass spheres is interesting to reduce the thermal conductivity of the concrete pieces. This work aims to evaluate the concrete with addition of hollow glass microsphere with different combinations of dosage in concrete concerning strength and workability. Slump tests were performed in each dosage of concrete in order to evaluate the effect of glass microspheres in concrete mix. In each age of curing concrete, bodies-specimens underwent ultrasound to estimate the homogeneity of concrete with hollow glass microspheres, and testing of compressive strength. The analysis of the results shows that for some formulations, the addition of hollow glass microspheres imparts high mechanical strength to compressive strength above 30MPa at all analyzed cure periods. The workability of the concrete had to be substantially reduced, showing no workability improvement due to the addition of hollow glass microsphere.

2013 ◽  
Vol 539 ◽  
pp. 64-69 ◽  
Author(s):  
Qing Wang ◽  
Lin Ge Qiu ◽  
Qi Yao ◽  
Zhao Yang Ding ◽  
Xi Fan Yan

Dry density and compression strength of foam concrete are conflicting, there is a negative relationship between them. Hollow glass microsphere is a new lightweight material which is lightweight, high strength, low thermal conductivity and good thermal stability. In order to prepare lightweight and high-strength foam concrete, this paper researched the effects of different dosage on dry density and compressive strength of foam concrete through adding hollow glass microspheres. The results show that the thermal conductivity of foam concrete increased as the hollow glass microsphere increases, and the dry densities of foam concrete are between 120-200 kg•m-3, compressive strength reaches 0.1MPa.


Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 505
Author(s):  
Jintao Sun ◽  
Fei Cai ◽  
Dongzhi Tao ◽  
Qingqing Ni ◽  
Yaqin Fu

Glass fiber fabrics/hollow glass microspheres (HGM)–waterborne polyurethane (WPU) textile composites were prepared using glass fiber, WPU, and HGM as skeleton material, binder, and insulation filler, respectively, to study the effect of HGM on the thermal insulation performance of glass fiber fabrics. Scanning electron microscopy, Instron 3367 tensile test instrument, thermal constant analysis, and infrared thermal imaging were used to determine the cross-sectional morphology, mechanical property, thermal conductivity, and thermal insulation property, respectively, of the developed materials. The results show that the addition of HGM mixed in WPU significantly enhanced thermal insulation performance of the textile composite with the reduction of thermal conductivity of 45.2% when the volume ratio of HGM to WPU is 0.8 compared with that of material without HGM. The composite can achieve the thermal insulation effect with a temperature difference of 17.74 °C at the temperature field of 70 °C. Meanwhile, the tensile strength of the composite is improved from 14.16 to 22.14 MPa. With these results, it is confirmed that designing hollow glass microspheres (HGM) is an effective way to develop and enhance the high performance of insulation materials with an obvious lightweight of the bulk density reaching about 50%.


2013 ◽  
Vol 467 ◽  
pp. 247-252 ◽  
Author(s):  
Semenov Vyacheslav ◽  
Oreshkin Dmitriy ◽  
Rozovskaya Tamara

In the paper the research results of light-weight masonry mortars with hollow glass microspheres (HGMS) and antifreeze admixtures (AFA) for masonry walling of the efficient small items at the low temperatures are given. One has chosen the antifreeze admixtures for the mortars and their rate has been justified. The main properties of the masonry mortars with HGMS and the antifreeze admixtures have been determined. The standard research methods are used. Main attention was paid to the analysis of strength of the mortar with HGMS and the antifreeze admixtures formed at the positive and negative temperatures. The optimal mixtures for the temperature down to 10 °C were developed. A priority direction of development of construction science currently is energy saving and the improvement of energy efficiency of buildings and structures. A part of the solution to this problem is the development of efficient building materials and fencing structures. The use of multi-layer fencing structures is known to lead to a decrease in the coefficient of their thermal uniformity [. In this regard, the most promising is the development of single-wall exterior fencing structures, which answer the requirements of the standards for thermal protection. However, single-wall fencing structures answering the requirements for thermal protection must have an average density value not greater than 500 kg/m3. The materials from cellular concrete, polystyrene concrete, foam ceramics concrete and others satisfy the aforesaid requirements. The monolith unity of similar structures is provided through the use of mortars on the basis of mineral, mineral-and-polymer and polymer binders [2-. Such mortars with high average density and a high coefficient of thermal conductivity are the bridges of cold in the construction; they do not provide the thermal homogeneity of the fencing structure and reduce its thermal resistance. A solution to this problem is the use of light-weight masonry mortars (warm mortars). Such mortars with traditional light-weight fillers (e.g. expanded perlite and vermiculite mortar sands) have an increased water requirement, and, as a consequence, the extremely low strength value. Recently, hollow glass (HGMS) or ceramics (CMS) microspheres are used as light-weight fillers for masonry mortars [. Thus, in [ the scientific principles of the use of such compositions with HGMS have been developed. The masonry mortar has been obtained with the following properties: average density of dried mortar is 450 kg/m3 with a coefficient of thermal conductivity equal to 0.17 W/m·°C and a compressive strength equal to 3.2 MPa at the age of 28 days, water-retention capacity over 90% and with optimal technological and rheological characteristics [.


Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1480
Author(s):  
Yizhe Ma ◽  
Ying Du ◽  
Jin Zhao ◽  
Xubo Yuan ◽  
Xin Hou

In this study, a new class of thermal insulation composites was prepared by blending a modified hollow glass microsphere (HGM) with furan resin. The particle dispersion between the microparticles and resin matrix was improved using 3-methacryloxypropyltrimethoxy silane (KH-570). Furthermore, the structure and morphology of the modified HGM were characterised by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). In addition, the effects of the modified HGM on the thermal insulation, flame retardancy, and thermal properties of the composites were investigated. The thermal conductivity of the composites was lower than that of the native furan resin. The minimum thermal conductivity of the composites was 0.0274 W/m·K; the flame retardancy of the composites improved, and the limiting oxygen index become a maximum of 31.6%, reaching the refractory material level. Furthermore, the thermal analysis of the composites demonstrated enhanced thermal stability. This study demonstrates that the composite material exhibited good thermal insulation performance and flame retardancy and that it can be applied in the field of thermal insulation.


2020 ◽  
Vol 29 ◽  
pp. 2633366X2097468
Author(s):  
Rui Li ◽  
Peng Wang ◽  
Peng Zhang ◽  
Guisen Fan ◽  
Guojun Wang ◽  
...  

A novel epoxy resin (EP)/hollow glass microsphere modified (g-HGM) composite was successfully prepared. Studies showed that the water absorption rate of the g-HGMs/EP composite is lower than pure HGMs/EP and HGMs-KH550/EP composites, while the compressive strength of g-HGMs/EP composites could be increased. The enhanced interfacial adhesion between EP and g-HGMs played an important role to improve the compatibility of the two components. The g-HGMs show little effect on density (relative to HGMs) on the g-HGMs/EP composites, which can perform better than the HGMs/EP composites being used in marine environments. It was found that the optimal content of 4,4’-diphenylmethane diisocyanate in the epoxy component was 20 wt%.


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