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Skip to main content. Log In Sign Up. Utilisation of construction demolition waste as stabilised materials for road base 22ctn. See discussions, stats, and author profiles for this publication at: Hanoi, 26 – 27 March Utilisation of construction demolition waste as stabilised materials for road base applications Tong T. Thanh2 and Phung V. The rate of construction development in Vietnam currently increases rapidly. Many old buildings have been demolished and replaced by new buildings.
This demolition has caused a huge con- struction waste at demolition sites but not yet been utilised. Meanwhile, natural materials to produce mor- tar, concrete and road base is limited for the environment impact of exploiting process.
This paper presents experimental results of utilising construction demolition waste CDW as stabi- lised materials for the subgrade or the base of roads. The CDW was used for substituting natural aggre- gates in these road structures. The results focused on effects of cement content on some subgrade proper- ties such as: The results indicated that CDW could replace natural aggregate in road base layers in Vietnam. As reported by the na- tional environment agency on solid waste in MORE,the amount of municipal solid waste generated about So in the 22tcnn years, a huge amount of CDW will be discharged in the large cities or urban areas.
Recycling and reuse CDW has been studied and applied for practical since the last few decades in a number of countries around the world Hansen, This has brought great benefits in terms of economic, 22tvn and environment aspects. This causes environ- mental pollution, waste landfill area and costly transportation as well as waste of material sources.
In ad- dition, research on utilisation of CDW for road foundation has not been interested in Vietnam. There are no construction procedures and standards for testing as well as specifications of recycled CDW materials when they used for foundation layers and pavement road.
crushed aggregate cbr test
Motorway generally consists of two parts foundation structure and surface structure. These structures possibly include multiple layers with different materials Figure 1. The choice of materials for 22tnc and subbase are guided in TCVN Diagram of pavement structure and foundation layers 22TCN, Table 1: Required strength of cement treated sand 22TCN, Strength demand at 28 days Mpa Position of cement treated structures Compressive strength Splitting tensile strength The 33-206 layer of the high performance pavement and surface layers with bitumious 3.
The lower base layer of the high performance 2. In other cases 1. The characteristics of base or subbase layers such as maximum dry density, optimum water content, compressive strength, splitting strength, etc have been tested in laboratory conditions. There are two types of recycled aggregates RAs from two different sources, RA from masonry debris called recycled masonry aggregate RMAand RA from concrete or concrete reinforcement structures called recycled concrete aggregate RCA.
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Maximum dry density and optimum moisture content are determined using the standards for transpor- tation 22TCN Natural coarse aggregate and RAs mixture using compac- tion method I-D mould with 332-006 sand and RAs sand treated cement mixtures used com- paction method I-A mould with Vibrating compacted density is determined in the following procedure: During vibration of the sec- 22tcb layer, the material is fulfilled. The vibration table has 22tnc frequency vibration of rounds per minnute and an amplitude of 0.
The compressive strength and splitting tensile strength are determined using the standard for transpor- tation 22TCN The basic properties of natural aggregate and RAs No. Particle size distribution of natural aggregate and RAs – From Table 4, we found that: Cement PCB30 Hoang Thach, available on the Vietnamese market, was used in this research to inves- tigate the possibility of RAs used for road foundation layers reinforced with cement.
22 TCN Experimental procedure to determine CBR of soil, macadam in laboratory
The properties of cement meets the requirement s of TCVN From the relation between dry density and water content of RAs as well as NAs, the optimum moisture and maximum dry density were also determined.
And during compac- tion, the mortar in concrete and masonry was probable broken, resulted in increase of the density. RMA has composition of brick and mortar debris which is lighter than NAs, this may decrease the maximum dry density of RMA to the smallest.
This suggests that there are a lots of porosities in RAs which could absorb much more water than the natural materi- als. This supports to the ability of using RAs for wet road layers with a fast draining capability for the surface layer. RAs particles larger 5mm and smaller than 5mm at difference ratios were mixed and tested with various vibration time.
The experimental results of two types RAs are shown in Table 5 and Table 6. From the above Tables, the relationship between compacted density of RAs mixture with vibration time are depicted in Figure 5 and Figure 6. Relations between compacted density of RMA and vibration time Figure 6.
Relations between compacted density of RCA and vibration time – In general, increasing the vibration time increased, the compacted density of RAs mixture, especially at vibration from 0s to60s. The re- sults are shown in Table 7. Optimal water content and maximum dry density of RAs sand NFA treated by cement – The optimum water content of all sand increased as the cement content and the value of the optimal moisture of both RAs cement treated This is not the same rules occurred with natural sand.
The results obtained are shown in Figure 8. Relations between NFA, RAs sand and cement content – The compressive strength and splitting tensile strength of RAs sand increased as cement content increased, this is similar to the rules occurred with natural sand.
RAs sand can be used for lower layer of the pavement structure when being reinforced with 5. When RAs sand used for the upper layer of the high performance pavement and surface layers with bitumious laminatation, the cement content needs to be added about 6.
Procedure to determine the splitting tensile strength of granular material stabilized by binder.
Design standard for soft pavement Industry standards. Procedure of construction and acceptance of the cement treated sand layer for pave- ments. Procedure of compacted soil, crushed stone in the laboratory. Procedure of construction and testing of macadam foundation layer in the pavement structure of high way. Removal and Reuse of Hardened Concrete. A some of resolutions to removate and reconstruct of the old damaged and degraded apartments in the big 22ctn in Vietnam.
Resolution of Vietnam government.
crushed aggregate cbr test
Demolition and Reuse of Concrete and Masonry: Final report of Ministry of Construction. Ministry Of Re- sources 22tcn Environment. Design standard for high way. Ministry Of Resources and Environment. Construction soil- Testing method for determine partical size distribution in labratory. Portland cement blended – Specifications. Studying the posibility of recycling demolition watste to produce construction materials.
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