A kind of determination method of calcium hydroxide content in concrete
A calcium hydroxide and determination method technology, which is applied in measuring devices, material weighing, instruments, etc., can solve the problems of long test period and slow carbonization process, and achieve the effects of simple determination method, convenient carbonization and convenient operation
Inactive Publication Date: 2016-08-17
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology
[0009] In order to improve the durability of concrete engineering, prolong the service life of buildings, and promote the realization of environmental protection and sustainable development strategies, the China Academy of Building Research has successively compiled (revised) the national standard "Ordinary Concrete Long-term Standards for Performance and Durability Test Methods" (GB / T50082-2009) durability supporting standards, formulated "Concrete Carbonation Test Chamber" (JG / T247-2009) supporting standards for concrete durability, and Chinese patents proposed a variety of concrete carbonation Test chambers, such as pull-out concrete carbonation test chamber (201020677534), concrete carbonation test chamber with automatic dehumidification function (201120205970), a concrete carbonation test chamber (201220177530), an intelligent concrete carbonation test chamber (01244866) and Liquid crystal display control concrete carbonation test box (201020677443), etc. These methods and devices are very common in laboratories, providing conditions for concrete carbonation, but the general test objects are concrete and mortar, so the carbonization process is slow and the test period is long
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[0037] In the raw materials for preparing concrete in this embodiment, the coarse aggregate is crushed stone of 5-20 mm, the fineness modulus of river sand is 2.8, the cement is PO.42.5 ordinary Portland cement, and the concrete mix ratio is shown in Table 1:
[0038] Table 1: River sand concrete mix ratio (kg / m 3 )
[0039]
[0040] The sample powder adopts accelerated carbonization, and the accelerated carbonation test is carried out according to the standard method in the "Ordinary Concrete Long-term Performance and Durability Test Method" (GB / T50082-2009); first, 5 parts of the sample powder obtained by grinding the concrete surface are taken, and each A portion of 2g is put into a rotating concrete powder carbonization container for complete carbonization, and a portion is taken out every 24 hours for calcium carbonate content detection, and finally 5 portions of calcium carbonate content data are obtained, as shown in Table 2:
[0041] Table 2: Relationship between c...
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Abstract
The invention belongs to the technical field of test methods for civil engineering materials, and relates to a method for measuring calcium hydroxide content in concrete. Firstly, concrete samples are layered and pulverized along the depth to obtain concrete powder, and the concrete powder is placed in a sealed bag. The surface of the sealed bag indicates the grinding depth of the concrete sample; then divide the concrete powder in the sealed bag into two parts, the first part measures the calcium carbonate content in the concrete powder before carbonization; the second part is measured after complete carbonization The content of calcium carbonate in the fully carbonized concrete powder; finally, according to the comparison of the content of calcium carbonate in the concrete powder before and after carbonization, calculate the content of calcium hydroxide in the concrete powder, and complete the determination of calcium hydroxide; the determination method is simple, the principle It is scientific and reliable, easy to operate, low in cost, high in accuracy and friendly to the environment.
Description
Technical field: [0001] The invention belongs to the technical field of test methods for civil engineering materials, and relates to a method for accurately measuring Ca(OH) in cement-based materials (concrete, mortar, etc.) 2 Content method, especially a method for the determination of calcium hydroxide content in concrete. Background technique: [0002] Portland cement is a multi-mineral and multi-component substance. After it is mixed with water, a chemical reaction occurs immediately. According to current research, after water is added to Portland cement, tricalcium aluminate reacts immediately, and tricalcium silicate reacts immediately. Calcium and iron tetracalcium sulfate also hydrate quickly, while dicalcium silicate hydrates more slowly. If some minor and minor components are ignored, the main hydration products formed after the action of Portland cement and water are: calcium silicate hydrate and calcium ferrite hydrate gel, calcium hydroxide, aluminum hydrate C...
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IPC IPC(8): G01N5/00
Inventor 范宏阚积鹏万小梅翟乃鑫
Owner QINGDAO TECHNOLOGICAL UNIVERSITY