Influence of Marble Powder on Mechanical Properties of Mortar and Concrete Mix
Er. Tanpreet Singh and Er. Anil Kumar Nanda, Associate Professor & Head Surya School of Engg. & Tech. Surya World, Rajpura
IntroductionBlended cements based on the partial replacement of Portland cement clinker (PC) by wastes have been the subject of many investigations in recent years. The use of the replacement materials offer cost reduction, energy savings, arguably superior products, and fewer hazards in the environment. These materials participate in the hydraulic reactions, contributing significantly to the composition and microstructure of hydrated product. In building industry, Marble has been commonly used for various purposes like flooring, cladding etc., as a building material since the ancient times. The industry's disposal of the marble powder material, consisting of very fine powder, today constitutes one of the environmental problems around the world. In India, marble dust is settled by sedimentation and then dumped away which results in environmental pollution, in addition to forming dust in summer and threatening both agriculture and public health. Therefore, utilization of the marble dust in various industrial sectors especially the construction, agriculture, glass and paper industries would help to protect the environment. Some attempts have been made to find and assess the possibilities of using waste marble powder in mortars and concretes and results about strength and workability were compared with control samples of conventional cement sand mortar/concrete.
MethodologyTo carry out the proposed study cubes of mortar (1:3) with varying partial replacement of cement with the same amount of WMP were cast and tested at three different intervals of 7days. Their results were compared with those of standard (1:3) mortar and concrete cubes.Detail of mortar mix has been shown in Table 1.
|Table 1: Mortar Mix (1:3) Proportion when cement was replaced.|
In the same way cube specimens and beams samples of M35 grade of concrete have been tested in laboratory for which each percentage of marble powder i.e. 0%, 5%, 10%, 15% and 20%. Three properties of concrete namely workability, compressive strength and flexural strength have been selected for study and evaluated according to IS: 1199-1959 and IS: 516-1959 respectively. Before initiating the test properties of materials were determined according to respective IS codes. The properties are shown in Table 2.
|Table 2: Material Properties|
|Material||Fineness/Fineness Modulus||Specific Gravity|
|Marble Powder||1.5 (m2/g)||2.67|
|Consistency of cement is 30%.
Initial and final setting time of cement is 127 minutes and 420 minutes respectively.
Fine aggregate conforms to zone III as per IS: 383 —1970.
Based on the Indian Standard (IS: 10262-1982), design mix for M35 grade of concrete was prepared by partially replacing fine aggregate with five different percentages by weight of marble granules (0%, 5%, 10%, 15%, and 20%). The mix proportion for M35 Grades of concrete with varying percentage of marble granules is presented in Table 3.
|Table 3: Mix Proportion for Concrete Mix|
|M35||%Marble||Sand (kg)||Waste Marble (kg)||C:w:fa:Ca:Wm|
|Cement content and coarse aggregate is 400 kg and 1165 kg respectively while W/C is 0.40 for each mix proportion.|
Results and DiscussionsMortar Mix
28 days Compressive Strength Test on Mortar
Test results tor every specimen were shown below in Table 4. It is observed here that with increase of WMP (replacing cement) the strength falls when the WMP is 15% or 20%.
|Table 4: Compressive strength for Mortar Mix (N/mm2).|
It is observed here that degree of workability is medium as per IS 456-2000. The slump values of the concretes obtained from waste marble granules mix gave negligible effect as compared to normal concrete mix as shown in Table 5.
|Table 5: Slump Value for Concrete Mix|
|% Replacement||Slump value (mm)|
The test results are also presented in Table 6. By increasing the waste marble granules the compressive strength values of concrete tends to increase at each curing age. This trend can be attributed to the fact that marble granules possess cementing properties. It is also as much effective in enhancing cohesiveness due to lower fineness modulus of the marble powder or granules both. Furthermore, the mean strength of concrete mixes with marble granules was 5-10% higher than the reference concretes. However, there is a slight decrease in compressive strength value concrete mix when 20% marble granule is used as compared with that of 15% marble granule mix.
|Table 6: Compressive Strength for Concrete Mix (N/mm2).|
Flexural Strength Test
The flexural strength calculations are done as per IS: 516-1959. The results of the flexural strength tests for the waste marble powder mix concrete are shown in Table 7. The results show that the flexural strength of waste marble mix concrete increases with the increase of thewaste marble ratio in these mixtures. This trend can again be attributed to the fact that marblegranules possess cementing properties.
|Table 7: Flexural Strength for Concrete Mix (N/mm2).|
Marble powder is partially replaced in cement by weight; there is a marked reduction in compressive strength values of mortar mix with increasing marble powder content when compared with control sample at each curing age.
Marble Mix Concrete
The slump values of the concretes obtained from waste marble granules mix gave negligible effect as compared to normal concrete mix. Degree of workability is medium conforming to IS: 456 – 2000. The mean strength of all concrete mixes with marble granules was 5-10% higher than the references concrete conforming to IS: 456-2000. The flexural strength of waste marble mix concrete increases with the increase of the waste marble ratio in these mixtures.
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