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CHEMISTRY LABORATORY |
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CHEMISTRY LABORATORY |
In line with company mission to be the leading multidisciplinary testing services in this region, Chemistry Laboratory was set up in 1997 to serve the industry’s need for Chemical Testing. |
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Through the years the laboratory has grown from just offering chemical testing for soil investigation into wide range of services that includes suitability of soil and aggragates for backfilling, suitability of aggregate for concreting, suitability of water for concreting, water effluent test, noise monitoring, total chlorine and chemical test on concrete. |
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In 2003,Chemistry Laboratory has obtained the SAMM Accreditation from the Department Standard of Malaysia (DSM). The recognition of DSM by International Laboratory Accreditation Cooperation Mutual Recognition Arrangement (ILAC MRA) on 16 January 2003 means our reports issued under SAMM logo are recognized as equivalent with those issued by ILAC MRA signatories. |
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SUITABILITY OF MATERIAL FOR BACK FILLING |
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Several tests need to be conducted to ensure materials are suitable for backfilling, Chemistry Laboratory provides the facility for chemical analysis on the significant elements that are stated largely in the specification for material use in backfilling.
All tests are base on BS or ASTM standard and accredited by SAMM. Vigorous verification has been conducted to ensure the laboratory are capable to produce results that are repeatable and reproducible. All our equipment are calibrated and traceable to National Standard
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PH Value
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CHEMICAL ANALYSIS FOR SOIL INVESTIGATION
The detailed chemical composition of soil is of little interest for civil engineering purposes, but the presence of certain constituents in soil can be very significant. Excessive acidity or alkalinity of the groundwater in soils can have detrimental effects on concrete buried in the ground. In the stabilisation of soil for roads, some resinous materials are unsuitable for alkaline soils but maybe satisfactory with neutral or slightly acid soils. Strong acid water conditions may warrant special concrete design or precautions, especially in submerged areas.
The chloride content determination is most often used as an indication of whether or not the groundwater is sea-water, or whether the soil has been affected by sea-water. Aqueous solution of chlorides cause corrosion of iron and steel, including steel reinforcement in concrete.
Measurement of the sulphate content enables the ground conditions to be classified according to potential sulphate attack. Sulphates in soil can cause disintegration of precast members such as slabs and concrete.
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Determination of Chloride Content
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DURABILITY OF CONCRETE
Reinforced concrete structures are exposed to harsh environments yet are often expected to last with little or no repair or maintenance for long periods of time. A durable structures needs to be produced. One of the major forms of environmental attack is chloride ingress, which leads to corrosion of the reinforcing steel and a subsequent reduction in the strength, serviceability and aesthetic of the structure. A common method of averting such deterioration is to prevent chlorides from penetrating structure to the level of the reinforcing steel bar by using relatively impenetrable concrete. The ability of chloride ions to penetrate the concrete must then be known for design as well as quality control purposes. Therefore, in order to assess chloride penetration. ASTM 1202–97 Rapid Chloride Permeability (RCP) measures the concrete resistance to chloride ions and estimation of the chloride diffusion coefficient in reasonable time.
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ENVIRONMENT MONITORING
Environment monitoring during construction project has become mandatory for new projects. Our service includes monitoring of noise, ground water or effluent, air and soil. We test all groundwater and effluent against DOE Standard A or B specification or of those stated in EIA Report.
In addition we also monitor environment noise that provides the data to be compared against the acceptable limits within the community. Generally, the sensitivity of human hearing is restricted to the frequency range of 20Hz to 20,000 Hz. The human ear, however, is most sensitive to sound in the 500 to 8,000 Hz frequency range. Above and below this range, the ear becomes progressively less sensitive.
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Environment Noise Monitoring
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SUITABILITY OF AGGREGATES FOR CONCRETING
Chemically stable aggregates in concrete do not react chemically with cement in a harmful manner. However, aggregates with certain mineral constituent will react with alkalies in cement, particularly when the concrete is subject to a warm moist environment. The potential alkali-silica reaction can be determine by using ASTM C 289-87.
Availability of chlorides ions in concrete containing embedded metal on the other hand increase the risk of corrosion. Apart from chloride, organic impurities may delay setting and hardening of concrete, it may also reduce strength gain and in unusual cases may cause deterioration.
Sulphates on the other hand can cause disintegration of precast members such as slabs and concrete pipes. Dissolved sulphates can attack cement causing crystallisation that also results in mechanical disintegration.
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SUITABILITY OF WATER FOR CONCRETING
BS3148:1980 provide the guidelines on the suitability of water for making concrete. Carbonates and bicarbonates of sodium and potassium have different effects on the setting times of different cements. Sodium carbonate can cause very rapid setting and bicarbonates can either accelerate or retard the set. In large concentrations these salts can materially reduce concrete strength.
Concerns over a high chloride content in mixing water is chiefly due to the possible adverse effect of chloride ions on the corrosion of reinforcing steel or pre-stressing strand. However concerns over a high sulphate content in mix water is due to possible expansive reaction and deterioration by sulphate attack Acidic of the water is also important as it may create handling problems
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GEOLAB(M)SDN.BHD.
Your One Stop Professional Testing Centre
380 Jalan Simbang , Taman Perling, 81200 Johor Bahru, Johor , Malaysia
Tel : 607-2364932 Fax : 6072364931
Website: www.geolab-sdn-bhd.com |
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